CHEMISTRY
CLASS – X
1.How will you define the rate of a chemical reaction? What is the meaning of average rate of a chemical reaction.
2.Which of the following reactions will favour the formation of product (s) when the temperature is raised by 10° C and reaction is carried out in a closed container?
(i) N2(g) + 3H2(g) 2 NH3(g) + 92KJ
(ii)2Cl2(g) + 2H2O(g) 4HCl(g) + O2(g) – 113 kJ
3.Write the equilibrium constant for the following reactions.
(a)2NO2(g) N2O4(g)
(b)2SO2(g) + O2(g) 2SO3(g)
(c)CO(g) + 3H2(g) CH4(g) + H2O(g)
(d)Fe3+(aq) + SCN–(aq) FeSCN2+(aq)
4.Calculate pH of 0.001M HNO3 solution if acid is fully dissociated.
5.Calculate pH of 0.005M H2SO4 solution if acid is completely dissociated.
6.Calculate pH of 0.005 M Ba(OH)2 solution assuming Ba(OH)2 is completely ionized.
7.2.8 g of KOH is dissolved in 500 ml of solution. Calculate pH of solution if KOH is full ionized in aqueous solution.
8.Calculate the pH of solution if [H3O+] = 1 × 10–4. State whether the solution is acidic, basic or neutral.
9.Calculate pH of solution if [OH–] = 1 × 10–4. State whether the solution is acidic, basic or neutral.
10.Calculate the value of equilibrium constant at 298 K if equilibrium concentration of reactants and products for the reaction.
CH3COOH(l) + C2H5OH(l) CH3COOC2H5(l) + H2O(l)
[CH3COOH] = 0.33 mol L–1, [C2H5OH] = 0.33 mol L–1, [CH3COOC2H5] = 0.66 mol L–1 [H2O] = 0.66 mol L–1.
11.Among the following indicate which can act as Bronsted and Lowery acids, bases and both.
(i)H3O+(ii)Cl–(iii)NH3(iv)
12.Calculate pH of 10–2 M HCl assuming complete ionization. State whether the solution is acidic, basic or neutral?
13.0.04g NaOH has been dissolved per litre of solution. What is its pH. Atomic weight of NaOH = 40 g mol L–1.
14.In the reaction. A(g) + B(g) 2C(g)
At equilibrium [A] = 2.25 mol L–1, [B] = 0.75 mol L–1, [C] = 0.5 moles L–1 in 1 litre flask. What is the value of equilibrium constant?
15.Classify the following as homogeneous or heterogeneous equilibrium.
(i)BaCO3(s) BaO(s) + CO2(g)
(ii)2CO(g) + O2(g) 2CO2(g)
16.Calculate pH of solution formed by dissolving 3.65 g of HCl per litre. (Molecular weight of HCl = 36.5 g mol L–1).
17.Which of the following will react at the highest rate?
(a)1 mol of A and 1 mol B in a 1 L vessel.
(b)2 mol of A and 2 mol of B in 2 L vessel.
(c)0.2 mol of A and 0.2 mol of B in a 0.1 L vessel.
18.How is quicklime prepared from lime stone ? Write the chemical equation for the involved reaction.
19.Write chemical equations to show what happens when
(i)Chlorine is passed over solid slaked when
(ii)Moist paste of plaster of Paris to a solid.
20.What is meant by bleaching? Write the chemical equation for the reaction involved in preparing bleaching powder.
21.Write chemical formula of washing soda and state its two important uses.
22.Name an alloy currently preferred for making containers of milk, food and for making household utensils. Why is it preferred?
23.A calcium compound having an odour of cholorine is used to remove yellowness of white clothes in laundries. Name the compound. Write the chemical equation involved in its preparation.
24.Give the chemical names of the following compounds and state one use of each of them.
(i) Washing soda(ii)Baking soda(iii)Bleaching powder
25.A white coloured compound reacts vigorously with water. The solution formed turns red litmus blue. It is used in the blast furnace to free the ore from the sand. Write the commercial name of the compound and its chemical formula. Mention its two other uses in industry.
26.A compound which is prepared from gypsum has a property of hardening when mixed with proper quantity of water. Identify the compound. Write the chemical equation of its preparation. Mention one important use of the compound.
27.A certain compound is alkaline in nature. On exposure to air it turns into white opaque powder Identify the compound and mention its two uses.
28.How is bleaching powder prepared? Write the necessary chemical equation involved. Mention is one use.
29.Write the constituent of baking powder. How does it cause the cake to rise and become light?
30.Write the chemical name of plaster of Paris. Mention any two of its uses.
31.To remove gangue form an iron ore, a white substance is mixed with in a blast furnace. What is it ? State its one other application.
32.When carbon dioxide is blown into a transparent solution, it turns milky. Identify the chemical substance present in the solution. How is the chemical substance prepared? Write the chemical equation involved in the process.
33.What is calcium sulphate hemihydrates commonly known as? List its two uses.
34.Write the chemical name and formula of baking soda and mention one of its uses.
35.Write the chemical formula of washing soda. What happens when crystals of washing soda are exposed to air?
36.What is the common name of the compound CaOCl2? Name the substance which on treating with chlorine, yields bleaching powder.
37.How are coloured glasses made?
38.Give the names of raw materials that are required for the manufacture of washing soda by Solvay process. Write the reactions involved in the process.
39.State two reasons for counting sulphur amongst the non-metals. Which properties of sulphur make it possible to bring sulphur from a deep mine to the surface of the Earth by the Frasch process and to purify it by sublimation of liquid sulphur?
40.Write chemical equations to show what happens when
(i)SO3 is passed into water.
(ii)CO is passed over heated Fe2O3.
(iii)CuS is heated with CuO.
41.An ore gives sulphur dioxide (SO2) gas on heating with air. State the method that your would apply for its concentration. Name any two metal ores which can be concentrated by this method.
42.In what forms are metals found in nature? With the help of examples explain how metals react with oxygen and dilute acids. Also write chemical equations for the reaction.
43.Give with examples three common compounds in which metal occur in nature. Write chemical equation for the metal reacting with a dilute acid to produced for the reaction.
44.Wy is it necessary to concentrate ore before processing? Draw a labelled diagram of “Froth
floatation Process” for concentrating ore. State the principle of this process.
45.With the help of a labelled diagram, describe the process of extraction of sulphur by Frasch process.
46.Draw a labelled diagram of Frasch process for mining sulphur. State the function of the following in the Frasch process : (i) Super heated water (ii) Air at high pressure.
47.Name the chief ore of Al used in Baeyer’s process. Describe the method of extraction of pure aluminium oxide from the ore with chemical equation.
48.Explain how the following metals are obtained from their compound by the reduction process:
(a)Metal ‘X’, which is low in reactivity series
(b)Metal ‘Y’, which is middle of the series
(c)Metal ‘Z’, which is high up in the reactivity series.
49.What is an alloy? Name the constituents of (i) brass and (ii) bronze. Give one use of bronze specifying the property on which this is based.
50.What is meant by allotropy and allotropes? Illustrate with examples.
51.You are given a sample of an ore containing sulphide of copper along with a high percentage of unwanted materials. With the help of a diagram describe the process by which you would remove the unwanted materials from the given ore.
52.With the help of a labelled diagram, explain the method used to concentrate sulphide ore. What elements are added to copper to make bronze and brass?
53.What are allotropes? Name two allotropes of carbon. Why do they differ from each other with reference to (i) conduction of electricity and (ii) hardness?
54.Draw a labelled diagram for Frasch process for extraction of sulphur from sulphur beds.
(i)What is the function of super heated water in the process?
(ii)Why is the sulphur pushed out through the middle pipe?
55.What is an alloy? Give the composition of an alloy called magnalium. Give two of its uses.
56.An ore gives CO2 on treatment with dilute acid. Identify the ore and name the process that should b used to concentrate this ore. Outline two steps that should be taken to convert such a concentrated ore into free metal.
57.Element E is highly reactive and its electronic configuration is 2, 8, 5. If this element is present in all living organisms, answer the following questions :
(a)What is the name of element E?
(b)Write two valencies exhibited by element E.
(c)Write two allotropes of E.
58.Element E has electronic confituration 2, 8, 6. It occurs both in free state and combined state. This element is mined by Frasch process. Now answer the following:
(a)What is name of element E?
(b)Write the three valencies of E.
(c)What is physical state of E at room temperature?
59.Give any three differences between Na and silicon.
60.Give the names of the following :
(i)an aldehyde derived from ethane
(ii)a ketone derived from butane.
(iii)the compound obtained by oxidation of methanol by chromic anhydride (CrO3)
(iv)the substance formed on catalytic hydrogenation of methanal.
61.Describe Tollen’s test. Write the equations of the reactions involved in this test.
62.Which class of compounds gives positive Fehling’s test? Write the reactions involved in this test.
63.Give any two uses of methanal.
64.How is propane prepared commercially? Give the reactions involved in it.
65.Give an example of an addition reaction of propanone.
66.How is ethanoic acid prepared commercially from methanol?
67.How is ethanoic acid prepared commercially from methanol?
68.Explain the following terms:
(i)sodium(ii) sodium carbonate
(iii)ethanol in presence of conc. H2SO4 and (iv) soda lime
69.What are polymers? Hoe are they classified?
70.Give two examples each polymers belonging to different classes.
71.Write IUPAC names of
(i)CH3COCH2CH3(ii)CH3 – CH – CH3
OH
(iii)HCOOH(iv)CH3COOCH3
72.Why are soaps not suitable for washing clothes in hard water?
73.Explain how natural rubber is obtained from lated of the rubber tree. What is done to improve the properties of natural rubber?
74.Give two uses of each of the following compounds.
(i)Ethanol(ii)Acetic acid
75.Give two characteristics and two uses of nylon fibres?
76.What are the advantages when terylene is mixed with wool to prepare fibre?
77.What are natural fibres? Give two examples of natural polyamide fibres.
78.How do we obtain pure silk?
79.Give two advantages and two disadvantages of soaps over detergents.
Graphics By:- Pradeep Tokas 1Written By:- Raj Kumar Badhan