Sample Paper
Science Quiz (Chemistry)
Q 1.The equivalent weight of a metal, 6 g of which evolve 5.6 L of H2at NTP from an acid is:
(a)6(b)12(c)24(d)2.4
Q 2.The percentage of H2 in the hydride of an element having equivalent weight 11.5 is:
(a) 7.06(b)8.06(c)4.03(d)12.09
Q. 3The equivalent weight of SnCl2in the following reaction, SnCl2 + Cl2 → SnCl4 is:
(a) 190(b)119(c)95(d)380
Q4.Chloride of a metal M contains 47.23% of the metal. 1.0 g of this metal displaced from a compound 0.88 g of another metal N. The equivalent weight of M and N are respectively:
(a) 39.77, 29.96(b)63.54, 28(c)31.77, 81.7(d)31.77, 27.96
Q 5.On heating 0.398 g of a metal oxide in a current of dryhydrogen, 0.09g of water were formed. The equivalent weight of the metal is:
(a) 31.8(b)63.6(c)15.9(d)2.0
Q 6.1.52 g of the hydroxide of a metal gave on ignition, 0.995 g of the oxide. The equivalent weight of the metal is:
(a) 4.53(b)9.06(c)27.18(d)36.24
Q 7.The equivalent weight of HNO3 in the reaction:
2HNO3→ 2NO + H2O + 3 O is :
(a) 21(b)42(c)63(d)10.5
Q 8.The equivalent weight of H2SO4 in the reaction:
Na2CO3 + H2SO4→Na2SO4 + CO2 + H2O is :
(a) 98(b)49(c)32.6(d)16.3
Q 9.The equivalent weight of H2SO4 in the reaction:
Na2CO3 + H2SO4→NaHSO4 + CO2 + H2O is :
(a) 49(b)4.9(c)98(d)196
Q 10.The number of milliequivalents of Mg (OH)2 in its 5.8 g are:
(a) 100(b)200(c)400(d)600
Q 11.The equivalent weight of Ca (OH)2whose 250 milliequivalents solution contains 18.5 g of it, is :
(a) 37(b)18.5(c)74(d)148
Q 12.The number of milliequivalents present in 25 mL of 0.2 M Mg(OH)2 are:
(a) 5.0(b)10.0(c)15.0(d)20.0
Q 13.The number of milliequivalents present in 25 mL of 0.2 N Mg(OH)2 are:
(a) 0.5(b)0.25(c)5.0(d)10.0
Q 14.The equivalent weight of NO3¯ in :
NO3¯ → N2O is :
(a) 15.5(b)31.0(c)62(d)124
Q 15.The equivalent weight of SO2 in the reaction:
SO2+ H2O + O → H2 SO4 is :
(a) 8(b)16(c)32(d)64
Q 16An element having three isotopes has mass numbers M,M + 1 and M+2. Their mean atomic mass is M + 1.2. The ratio which corresponds to the given data is :
(a) 1:1:1(b)1:2:3(c)2:3:4(d)1:3:5
Q 17A certain metal is divalent. 2.65 g of its oxide when reduced in a current of hydrogen leaves 2.454 g of the metal. The atomic weight of the metal will be :
(a) 100.16(b)200:32(c)50.08(d)25.04
Q 180.45 g of a metal displaced 560 cm3of hydrogen at N.T.P. from an acid. If specific heat of metal is 0.214, the atomic weight of the metal is:
(a) 27 amu(b)13.5 amu(c)54 amu(d)None of these
Q 19.When a metal weighing 0.3g was treated with an acid, liberated 280 cm3of H2 at STP. It forms an oxide MO where M stands for the metal. The atomic weight of the metal is :
(a) 6g(b)1.1 amu(c)24 amu(d)12 amu
Q 20.When a metal carbonate weighing 0.84g was heated strongly, 0.40 g of metal oxide was left as the residue. The specific heat of the metals 0.25. The atomic weight of the metal is :
(a) 6 amu(b)12 amu(c)18 amu(d)24 amu
Q 21.The vapour densities of four compounds of a certain metal are 8.5, 22, 23 and 26 respectively. The percentage of same elements in these compounds are 82.4, 63.7, 89.4 and 58.8 respectively. The atomic weight of the metal is :
(a) 14(b)41(c)28(d)30.5
Q 22.Three atoms of a metal combine with two atoms of nitrogen to form metal nitride. If the metal nitride contains 81.08% metal and 18.92%, nitrogen, the atomic weight of the metal is :
(a) 10(b)20(c)40(d)35
Q 23.1.5276g of CdCl2 was found to contain 0.9367 g of cadmium. The atomic weight of cadmium is :
(a) 112.54 amu(b)52.27 amu(c)225.08 amu(d)None of these
24.On dissolving 2.00 g of a metal in sulphuric acid, 4.51 g of the metal sulphate was formed. The specific heat of the metal is 0.057 cal(g ¯). The valency of the metal and its exact atomic weight are :
(a) 228 amu(b)114.75 amu(c)110 amu(d)56 amu
25.A compound contains 28 percent of nitrogen and 72 percent of a metal by weight. 3 atoms of the metal combine with 2 atoms of N. The atomic weight of the metal is :
(a) 6 amu(b)12 amu(c)24 amu(d)18 amu
26.In order to obtain 1 gm of hydrogen from dil. H2SO4, 32.5 g of zinc has to be dissolved. If the atomic weight of the zinc is 67, its valency is :
(a) 1(b)2(c)3(d)4
27.A solid element has a specific heat of 1 J g¯ K¯. The approximate atomic mass of the element is :
(a) 17(b)27(c)2.7(d)1.
28.In oxide of an element possesses the formula M2SO3. If the equivalent weight of the metal is 9, then the atomic weight of the metal will be:
(a) 18(b)1.8(c)2.7(d)27
29.Density of ethanol is 0.791 g cm¯3. Its value in SI unit will be :
(a) 7.91 g cm¯3. (b)79.1 g cm¯3. (c)791 g m¯3. (d)791 kg m¯3
30.The mass of carbon tetrachloride having volume 6.25 Land density 1.6 g cm¯3. will be :
(a) 10 g (b)100 g (c)10 kg (d)200 g
31.25 cm3 of an unknown acid (density, 1.2 g cm¯3) contains 9.2 g of the acid. The percent by weightof the acid in the concentrated acid will be :
(a) 69.33% (b)30.67%(c)20% (d)80%
32.At a particular place, 1000 mL of air weighs 1.248 g. The specific gravity of air in terms of hydrogen if 1g H2 occupies 11200 mL volume will be :
(a) 13.98(b)10(c)16 (d)2.47
33.224 cm3 of a gas at S.T.P. weighs 0.44 g. The vapour density of the gas will be :
(a) 22(b)11(c)1.1 (d)3.3
34.The density of nitrogen gas at 350C and 2 atmospheric pressure is :
(a) 1.11 g cm¯3(b)2.22 g L¯(c)3.1 g L¯ (d)4.5 kg m¯3
35.The specific gravity of a sample of 22% pure liquid is 1.1 g (mL¯). The volume of it required to get 56 g of it will be :
(a) 10 mL(b)200 mL(c)50 mL (d)231.4 mL
36.A sample of 98% acid has a density of 1.9 g cm¯3. The amount of pure acid present in 2 L of the acid is :
(a) 3.724 kg(b)372.4 g(c)3.724 g (d)100 g
37.2 dm3 of a gas at STP weighs 2.88 g. If 1 dm3 of H2gas weighs 0.09 g at NTP, the mol.wt. of the gas would be:
(a) 4 g mol¯(b)8 g mol¯(c)32 g mol¯(d)64 g mol¯
38.5 dm3 of a gas at 140C and 729 mm pressure weighs 8.96 g. The mol. wt. of the gas is:
(a) 87(b)44.0(c)21.75(d)17
39.If atomic weights of zinc and oxygen are 65 amu and 16 amu respectively, the molecular weight of zinc oxide in g mol¯will be :
(a) 8.1 g mol¯(b)1.8 g mol¯(c)81 g mol¯(d)None of these
40.The molecular weight of a gaseous substance is 80. The volume of the one gram of the gas at 00C and 720 mm of mercury pressure will be :
(a) 295.7 mL(b)0.2 L(c)0.3 L (d)397 mL
41.The weight of sulphur dioxide contained in the same volume as that which contains 7.0 g nitrogen is :
(a) 8 g(b)16 g(c)32 g (d)64 g
42.1.25 g of the carbonate of a metal on ignition leave a residue of 0.7 g and a gas evolved occupying 312 cm3 at 270C and 755 mm. The molecular weight of the gas should be :
(a) 21.7 g(b)43.69 g(c)87.28 g (d)0.55 g
43.2.24 cm3 of a gas is produced at NTP by the action of 8.24 mg of alcohol (ROH) on methyl magnesium bromide. The molar mass of alcohol is :
(a) 92.29 g(b)184.58 g(c)369.16 g (d)22.4 g
44.A compound on analysis was found to contain 8% sulphur by mass. The least molar mass of that compound will be :
(a) 32 a.m.u.(b)256 a.m.u.(c)400 a.m.u. (d)92 a.m.u.
45.0.40 g of chloroplatinate of monoacid base on ignition gave 0.125 g of platinum. The molar mass of the base is :
(a) 214 g mol¯(b)107 g mol¯(c)2.14 g mol¯(d)12 g mol¯ (at.wt.Pt=195)
46Silver salt of a dibasic acid weighing 1.8 g gave 1.08 g of silver. The molar mass of the acid is :
(a) 166 g mol¯(b)1.66 g mol¯(c)146 g mol¯(d)292 g mol¯
47.0.45 g of a diacid base were dissolved in water and the solution was made up to 250 ml. 20 ml of this diluted acid required 15 ml of N/25 HCI for complete neutralisation. The molecular weight of the base is :
(a) 120 g mol¯(b)60 g mol¯(c)180 g mol¯(d)None of these
48.One molecule of a substance contains 6 carbon atoms, 12 hydrogen atoms and 1.5936 X 10¯22 g of the third component. The molecular weight of the substance is?
(a) 84 g mol¯(b)180 g mol¯(c)8.4 g mol¯ (d)85.5936X10¯22g mol¯
49.A plant virus is found to consist of uniform cylindrical particles of 150 A0in diameter and 5000 Å long. The specific volume of the virus is 0.75 cm3 g¯. If the virus is considered to be a simple particle, the molecular weight of the virus will be :
(a) 108 g mol¯ (b)1.234 x 107g mol¯(c)7.095 X107 g mol¯(d) 50,000g mol¯
50.56 cm3 of oxygen combine with 112 cm3 of hydrogen to form water : When 56 cm3 of H2 is passed over heated capric oxide, the latter loses 0.04 g of its weight. All measurements are done under similar conditions of temperature and pressure (at. wt., H=1, O=16). Which of the following law is obeyed by this data?
(a) Gay Lussac’s law of gaseous volume (B) Law of constant composition (c) Law of multiple proportion (d) Law of reciprocal proportion
51.ICI contains 77.8% iodine, Kl contains 23.6% K and KCI contains 52% of K. These results obey the law of :
(a)constant composition(b)Reciprocal proportion
(c)multiple proportion(d)conservation of mass
52.Hydrated zinc sulphate contains 22.65% Zn and 43.9% H2O. If the law of definite proportion is true, the weight of zinc used to produce 7.2 g of crystal would be :
(a) 3.2 g(b)1.63 g(c)0.815 g (d)None of these
53.An iodine compound on analysis was found to contain iodine and oxygen in the ratio of 127 g and 40 g by weight. If atomic weight of iodine and oxygen are 127 and 16 respectively, the formula of the compound will be :
(a) 12O3(b)12O4(c)12O5(d)12O
54.In an experiment, 1.0 g of lime stone (CaCO3) gave 224 cm3 of CO2 at NTP and 0.56 g of calcium oxide. These data illustrate the law of :
(a)Multiple proportion(b)Reciprocal proportion
(c)Gaseous volume(d)Conservation of mass
55.A sample of Mg CO3 has 28.57% Mg, 14.29% C and 57.14% oxygen. If the law of constant proportion is true, then the weight of carbon in 2.1 g of MgCO3 from another source will be :
(a) 0.1 g(b)0.2 g(c)0.3 g(d)0.4 g
56.Two isotopes of 35 Cl and 37Cl combine with sodium metal to form two samples of
17 17
sodium chloride. These compound formation obey the law of :
(a)equivalents(b)multiple proportion
(c)constant composition(d)None of these
57.8.5 g of silver nitrate react with KCI solution to give 7.15 gsilver chloride and 5.05 g KNO3. If the law of conservation of mass is obeyed, the weight of KCI used will be :
(a) 1.8 g(b)3.7 g(c)2.9 g(d)10.6 g
58.Out of two oxides formed by a metal, 0.72 g of the lower oxide forms 0.8 g of higher oxide. If the higher oxide contains 80% metal, the data is true for the law of :
(a)multiple proportion(b)combining weights
(c)gaseous volume(d)constant composition
59.Out of the two unknown hydrocarbons, 0.052 g of one gave 95.8 cm3 of CO2 , 0.016g of the other produced 23.9 cm3 of CO2. If both experiments were done at 150C and 755 mm pressure, the data illustrates the law of :
(a)combining proportion(b)definite proportion
(c)multiple proportion(d)gaseous volume
60.3.0 g of ethane (C2H6) gave 5.4 g H2O and 8.8g CO2 on complete combustion in oxygen. The data is true for the law of :
(a)constant composition(b)multiple proportion
(c)reciprocal proportion(d)conservation of mass
61.Some results of experiments are given below:
(a)In phosphorous chloride, P = 22.57%, Cl = 77.43%
(b)In phosphine, P = 91.18%, H = 8.82%
(c)In hydrogen chloride, H = 2.77%, Cl = 97.23%
The law of combination that obeys the given results is :
(a)conservation of mass(b)reciprocal proportion
(c)definite proportion(d)Gay Lussac’s law of gaseous volume
62.‘x’ g of sulphur and ‘y’ g of oxygen are allowed to react in a closed vessel so that no solid sulphur is left behind. The ratio of weights of x and y is :
(a) 2:1(b)1:2(c)1:1(d)4:1
63.x g of an element A reacts with y g of an element B. Also, y g of element B combines with 2 z of C. If one gram equipment of B weighs y g, then the mass ratio in which A and C combine is :
(a) x:y(b)y:z(c)x:2z(d)y:2z
64.If the absolute temperature of a gas is doubled and the pressure is reduced to one half, the volume of gas will :
(a)remain unchanged(b)be doubled(c)increase four fold
(d)be halved(e)be reduced to one fourth
65.To what temperature must a neon gas sample be heated to double the pressure, if the initial volume of the gas at 750C is decreased by 15%?
(a)3190C(b)5920C(c)1280C(d)600C(e)900C
66.2 g of O2 at 270C and 760 mm of Hg pressure has volume
(a) 1.5 lit.(b)2.8 lit.(c)11.2 lit.(d)22.4 lit.
67.A certain sample of gas has a volume of 0.2 litre measured at 1 atm pressure and 00C. At the same pressure but 2730C, its volume will be :
(a) 0.4 litres(b)0.8 litres(c)27.8 litres.(d)55.6 litres
68.One mole of monoatomic ideal gas at T (K) is expanded from 1 L to 2 L adiabetically under a constant external pressure of 1 atm. The final temperature of the gas in kelvin is :
(a) T(b) T__ (c)T - 2(d)T + 3
25/3-1 3x0.0821 2x0.0821
69.The ratio of rate of diffusion of helium with respect to methane under similar conditions of constant temperature and pressure is :
(a) 2(b)0.5(c)16(d)4
70.The average and total kinetic energies of 0.5 mol of an ideal gas at 273 K are respectively in KJ mol¯ :
(a) 2.5x102;3.9(b)3.405;1.7025(c)5.0x10¯4;7.8(d)6.81;4.08
71.1 mole of a N2O4(g) is kept in a container under 1.0 atmospheric pressure and 270C. It is heated to 3270C. As a result, 20% of N2O4(g) by mass decomposed to NO2(g). The resultant pressure is:
(a) 1 atm(b)1.2 atm(c)2.4 atm(d)3.6 atm
72.Hydrogen gas diffuses from two different vessels X and Y. Vessel X has a circular orfice while vessel Y has a square orfice of length equal to the radius of the orfice vessel X. Assuming same temperature and pressure, the ratio of the rates of diffusion of H2 gas from vessel X to vessel Y is :
(a) 1 : 1(b)1 : 2(c)1(d)π
π
73.The molecules of gas X more 3 times faster than those of gas Y at the same temperature. The ratio of the molecular weights Mxwill be :
My
(a) 1/10(b)1/9(c)1/8(d)7/1
74.Which of the following statement is false?
(a)The difference between rms velocity and mean velocity at any temperature for different gases diminishes as larger and yet larger molar masses are considered.
(b)The square of the mean velocity of molecules is equal to square of the rms velocity at a certain temperature.
(c)The ratio of the mean velocity to the rms velocity is independent of temperature.
(d)The mean K.E. of the gas molecules at any given temperature does and depend on the mean velocity.
75.For identical conditions of temperature, the density of a gas A is three times that of gas B but the molar mass of gas B is two times that of gas A. The ratio of pressure of gases A and B is:
(a) 3(b)1(c)6(d)1
36
76.Pressure remaining constant, at what temperature, the volume of a gas at 00 C will be double of the volume?
(a) 1000C(b)5460C(c)273 K(d)546 K
77.T = 550K, V=49.8 litre, n=2 mol, then the pressure will be (atm) :
(a) 2(b)4(c)1.5(d)2.5
78.If rms = 1000, the average velocity is :
(a) 920(b)820(c)1000(d)1020
79.Iodised table salt contains 7.6x10¯5g of KI per gram of NaCI. The concentration in ppm in KI is :
(a) 76(b)152(c)500(d)760
80.10 litre solution of urea contains 240 g urea. The active mass of urea will be :
(a) 0.02(b)0.04(c)0.2(d)0.4
81.For an ideal gas, number of moles per litre in terms of its pressure P, gas constant R and temperature T is :
(a) PT(b)RT(c)P (d)PRT
R PRT
82.If 0.44 g of a colourless oxide of nitrogen occupies 224 mL at 1520 mm Hg and 2730C, then the compound is :
(a) NO(b)NO2(c)N2O3(d)N2O
83.If the density of air at 298 K and 101.325 kPa is 1.161kg m¯3, then the average molar mass of air, assuming air behaves as an ideal gas is :
(a) 18 g mol¯(b)28 g mol¯(c)32 g mol¯(d)2g mol¯
84.If the value of critical pressure and critical temperature are 72 atm and 300C respectively, the value of Vander Waal constant ‘a’ will be :
(a) 0.0432 L mol¯(b)3.628 L2atm mol¯2
(c) 0.0216 L mol¯ (d)0.06 atm L2 mol¯2
85.The value of Vander Waal’s constant b for CO2 gas having critical pressure and critical temperature values 72.9 atm and 31.20C is :
(a) 0.342 L mol¯(b)0.342 L2atm mol¯2
(c) 0.0428 L mol¯ (d)0.0214 L mol¯
86.A real gas is supposed to obey the gas equation, P(V-b)=nRT at NTP. If one mole of a gas occupies 24 dm3 volume at NTP, the compressibility factor for the gas will be :
(a) 1.071(b)5.8 x 10¯3(c)2.9 x 10¯3(d)2
87.The temperature at which 2.5 mol of SO2 obeying the Vander Waal equation will occupy a volume of 12 litre at a pressure of 16 atm is :
(a) 788.69 K(b)1061.690C(c)2730C(d)1061.69 K
88.The reduced temperature of oxygen at 370C if critical temperature of this gas is 155 K, will be :
(a) 0.2167(b)2(c)0.5167(d)48
89.The reduced pressure of a gas is 0.1604. If critical pressure is 45.6 atm, its pressure will be :
(a) 3.5 x 10¯3 atm(b)45.76 atm(c)7.31 atm(d)None of these
90.The number of potassium atoms required for the preparation of 0.2 MKMnO4 are:
(a) 2.408 x 1023(b)1.408 x 1023(c)2.4 x 1022(d)1.204 x 1023
91.The number of molecules in 4.49 L of a gas at 00C and 1 atmospheric pressure is approximately :
(a) 12.06 x 1023(b)12.06 x 1022 (c)24.12 x 1022(d)24.12 x 1023
92.The percentage of sodium present is the cereal served in breakfast which is labeled to contain 110 mg of sodium per 100 g of cereal, is :
(a) 2%(b)3% (c)1%(d)0.11%
93.The number of gram atoms of oxygen (atomic mass, 16 a.m.u.) in 8 g of oxygen, is
(a) 0.1(b)0.3 (c)0.5(d)5.0
94.0.01 mol of a compound weighs 1 g . The molecular mass of the compound is :
(a) 20 a.m.u.(b)50 a.m.u. (c)100 a.m.u.(d)2.0 a.m.u.
95.Volume occupied by one molecule of water (density = 1 g cm¯3 ) is :
(a) 3.0 x 10¯23 cm3(b) 5.5 x 10¯23 cm3 (c) 9.0 x 10¯23 cm3 (d)6.023 x 10¯23cm3
96.The number of atoms (x) of oxygen present in 88g of CO2 and (y) the mass of CO having same no. of oxygen atoms are :
(a) (x) 1024 (y) 100 g (b) (x) 2.408 x 1024 (y) 105g.
(c) (x) 2.408 x 1024 (y) 112g.(d)None of these
97.The molecular mass of hydrogen chloride (HCI) having absolute density 1.63 g L¯, is :
(a) 3.651 g(b)36.51 g (c)18 g(d)9 g
98.The weight of one litre of an unknown gas is 1.25 g at N.T.P. Which of the following gas pertains to the given data?
(a) N2(b)N2O (c)N2O2(d)N2O4
99.The minimum molecular weight of insulin containing 3.4% sulphur is :
(a) 941.176 g. mol¯ (b) 4703 g. mol¯ (c) 10.625 g. mol¯ (d)106.25 g. mol¯
100.How many moles of lead (II) chloride will be formed from a reaction between 6.5 g of PbO and 3.2 g HCI?
(a) 0.011 (b) 0.029 (c)0.044 (d)0.333
101.If three elements, A, B and C crystallised in cubic solid lattice with A atoms at corners, B atoms at cube centre and C atoms at the edges, which formula of the compound is expected out of :
(a)ABC3’(b)ABC2’(c)ABC,(d)AB3C,
102.The radius of A+ in ionic compound AB is 0.225 A. If AB has ZnS structure, the ideal radius of B- will be :
(a)5.06 pm, (b)50.6 pm,(c)100 pm, (d)150.6 pm,
103.A substance crystallises to f.c.c. lattice having 6Å edge length. If the density of unit cell is 2kg dm¯3, the molar mass of substance is :
(a)51.65 g mol¯ (b)25.8 g mol¯ (c)76.4 g mol¯ (d)65.04 g mol¯
104.An ionic compound AB crystallieses in b.c.c. lattice. If its unit cell edge length is 412 pm and radius of B¯ is 181 pm, the radius of A+ is :
(a)200 pm (b)175.8 pm(c)351.6 pm (d)100 pm
105.An XY ionic compound has zinc sulphide type structure. If the radius of Y ¯ is 100 pm, the radius of X+ will be :
(a)45 pm (b)0.225 Å(c)120 pm (d)2.25Å
106.The number (n) of atoms in a cube when atoms are given on its own diagonal are :
(a)n(b)2n(c)3n(d)4n
107.The number of atoms in a cubic based unit cell having one atom on each corner and two atoms on each body diagonal are :
(a)1(b)2(c)3(d)4
108.How many unit cells are present in a cube shaped ideal crystal of NaCI of mass 1.00 g? (atomic masses, Na = 23, CI = 35.5).
(a)1.71 x 1021 unit cells (b)2.57 x 1021 unit cells
(c)5.14 x 1021 unit cells (d)1.28 x 1021 unit cells
109.A binary solid (A+B-) has a zinc blende structure with B¯ ions constituting thelattice and A+ ions occupying 25% tetrahedral holes. The formula of solid is :
(a)AB3(b)AB2(c)AB4(d)AB
110.The percentage of free space is a body centred unit cell is :
(a)34%(b)28%(c)30%(d)32%
111.The limiting radius ratio for tetrahedral shape is :
(a)0.155 to 0.225 (b)0.225 to 0.414 (c)1.0 to 1.55(d)1.55 to 0.225
112.The number of octahedral sites for sphere in a cubic closest-packed (face-centred cubic) structure are :
(a)One (b)Two (c)Three(d)Four
113.A metal of atomic mass = 75 forms a cubic lattice of edge length 5Å and density 2 g cm¯3. The radius of atom (Avogadro’s number, NA = 6 x 1023) is :
(a)217 pm (b)100 pm (c)217 Å(d)None of these
114.The volume of O2 required for the complete combustion of 120 cm3 of methane gas in a eudiometer tube will be :
(a)60 cm3(b)120 cm3 (c)240 cm3(d)360 cm3
115.The volume of Oxygen gas required for the complete combustion of 1.12 litre of ethene at 270C and 750 mm pressure will be :
(a)1L(b)2L (c)2.3 L(d)3.03 L
116.A mixture of 25 mL nitric oxide and 25 mL of oxygen was sparked in a eudiometer tube. The volume of the gas left behind after treated with KOH solution would be :
(a)12.5 mL O2 (b)25 mL O2 (c)2.5 mL O2(d)2.5 mL NO2
117.45 cm3of O2 was mixed with 6 cm3 of a gaseous hydrocarbon and exploded in a eudiometer tube. After explosion, the volume was found to be 36 cm3 . After treatment with KOH solution, the volume was left as 18 cm3. The molecular formula of the hydrocarbon is :
(a)CH4 (b)C2H4 (c)C2H2(d)C3H6
118.Of the following, the electromagnetic radiation with maximum wavelength is :
(a)Ultraviolet (b)Radiowaves (c)X-ray(d)Infra-red
119.Radius of second Bohr orbit of H-atom is …… times the first Bohr orbit of H-atom :
(a)4 times (b)2 times (c)5 times(d)3 times
120.Maximum number of orbitals in h subshell are :
(a)16 (b)11 (c)13(d)10
121.For azimuthal quantum number, 1 = 2, the maximum number of electrons will be :
(a)0 (b)5 (c)10(d)14
122.The radius of fifth orbit of the hydrogen atom is :
(a)6.612Å (b)13.225 Å (c)26.45 Å(d)None of these
123.The molarity of the originalH3PO4 solution if 18.0 mL of H3PO4 solution is required to completely neutralise 35.0 mL of 0.045 M Ba(OH)2 is :
(a)5.8 M (b)0.058 M (c)1.58 M(d)2 M
124.The number of electrons in sulphur atom having n+1 = 3 are :
(a)8 (b)6 (c)4(d)2
125.The orbital that has two angular nodal planes is :
(a)f (b)d (c)p(d)s
126.The ion which has the maximum magnetic moment is :
(a)Na+ (b)Fe3+ (c)Cr3+(d)Sc3+
127.The wave number of the shortest wavelength transition in Lyman series of atomic hydrogen will be :
(a)3647 Å (b)109678 cm (c)9.1x10¯6cm(d)9.1Å
128.When the frequency of light incident on a metallic plate is doubled, the kinetic energy of the emitted photoelectron will be :
(a)halved (b)unchanged
(c)increase but more than double of the previous K.E.(d)doubled
129.The light energy required by the interior of human eye to see an object is 10¯17J. The number of photons of green light (λ=550 nm) required to see the object will be :
(a)25 (b)26(c)28(d)30
130.The number of d-electrons retained in Fe2+ (at. no. of Fe=26) ion is:
(a)6 (b)3(c)4(d)5
131.Assuming the velocity to be same, which of the following is associated with smallest de-Broglie wavelength?
(a)An electron (b)A proton(c)An alpha particle
(d)All will have same wavelength
132.The total number of electrons that can be accommodated in all the orbitals having principal quantum number 2 and azimuthal quantum number 1 is :
(a)2 (b)6(c)10(d)14
133.Least paramagnetic property is shown by :
(a)Fe (b)Mn(c)Ni(d)Cu
134.Which of the following is not permissible?
(a)n=4, 1=3, m=0 (b)n=4, 1=2, m=1
(c)n=4, 1=4, m=1(d)n=4, 1=0, m=0
135.Effective magnetic moment of Sc3+ ion is :
(a)1.73 (b)0(c)5.92(d)2.83(d)3.87
136.The ratio of charge and mass would be greater for :
(a)proton (b)electron(c)neutron(d)alpha particle
137.The number of radial nodes of 3s and 2p orbitals are respectively:
(a)2, 0 (b)0, 2(c)1, 2(d)2, 1
138.Experimental dipole moment of HBr is 0.263 x 10─29 C.m. If bound length of H-Br is 1.41 Aº, the percentage of ionic character in H-Br is :
(a)5.8% (b)11.63%(c)23.26%(d)90%
139.The percentage ionic character of C-H bond in CH4 assuming the Pauli’s electronegativity value of C and H to be 2.5 and 2.1 respectively is :
(a)3.34% (b)6.68%(c)4.99%(d)6.96%
140.The covalent radius of double bonded oxygen atoms in CO2 is :
(a)0.98Aº (b)0.32Aº(c)0.49Aº(d)4.9 Aº
141.The number of period to which an element with atomic number 21 belongs is :
(a)1 (b)2(c)3(d)4
142.The number of π electrons present in 2.6 g of ethyne are :
(a)NA (b)2NA(c)0.4 NA(d)4 NA
143.Energy needed to convert 5.75 g Na-atom is gaseous state to form Na+ (g) is :
(a)2829 kj (b)28.29 kj(c)123 kj(d)282.9 kj
144.The hydrogen ion concentration of a solution having a pH value of 4.32 is :
(a)4.79 x 10¯5 (b)3.8 x 102(c)2 x 10¯6(d)11 x 10¯9
145.The electron affinity of CI when 1.0g of CI-atom is converted to CIֿ (g) liberate 9.83 kj energy is :
(a)-349 kj(b)+349 kj(c)35.5 kj(d)-35.5 kj