ICSE Class X Chemistry Practice Paper for 2018

ICSE Class X Chemistry Practice Paper for 2018

Choose the correct answer from the options given below: Supratim Das Sir 9434008713

1. Ionisation potential increases over a group from top to bottom because the

A Atomic radius increases and nuclear charge increases

B. Atomic radius decreases and nuclear charge decreases

C. Atomic radius increases and screening effect increases

D. Atomic radius decreases and nuclear charge increases

2. A compound X consists of only ions in a packed lattice structure. Hence, X will have

A Acrystalline hard structure and high melting point

B. A low melting point and low boiling point

C. An ionic bond and low melting point

D. A strong force of attraction between its molecules

3. When fused lead bromide is electrolysed, we observe

A Asilver grey deposit at the anode and a reddish brown deposit at the cathode

B. A silver grey deposit at the cathode and a reddish brown deposit at the anode

C. A silver grey deposit at the cathode and reddish brown fumes at the anode

D. Silver grey fumes at the anode and reddish brown fumes at the cathode

4. The main isomer of acetic acid is

A an acid

B. an ester

C. an anhydride

D. all of these

5. Heating an ore in a limited supply of air or in the absence of air at a temperature justbelow its melting point is known as

A Smelting

B. Ore dressing

C. Calcination

D. Bessemerisation

6. If an element A belongs to Group VII, then it will have

A. 7 valence electrons and high electron affinity

B. 7 valence electrons and high reducing property

C. 7 valence electrons and high IP

D. 7 valence electrons and high electropositive character

7. The molecule containing a double covalent bond and alcoholic group on the same carbon is called

A. alkynol

B. alcohol

C. enol

D. all of these

8. The compound with a triple bond and a sp hybridized carbon is

A. ethyne

B. propyne

C. 2-butyne

D. all of these

9. Aluminium powder is used in thermite welding because

A It is a strong reducing agent.

B. It is a strong oxidising agent.

C. It is corrosion resistant.

D. It is a good conductor of heat.

10. The IUPAC name of (CCl3)3CH is

A. 1,1,1,2,2,2 hexachloro 3 trochloromethyl propane

B. 2 trochloromethyl propane

C. 1,1,2,2,3,3 hexachloro 2 trochloromethyl propane

D. 1,1,1,3,3,3 hexachloro 2 trochloromethyl propane

Fill in the blanks from the choices given within brackets:

i. The basicity of benzoic acid is______(3, 1, 4 ).

ii. The compound formed when isopropyl alcohol reacts with sodium is______(sodium ethanoate,sodium isopropoxide, sodium propanoate).

iii. Quicklime is not used to dry HCl gas because______(CaO is alkaline, CaO is acidic, CaOis neutral).

iv. Ammonia gas is collected by______(an upward displacement of air, a downward

displacement of water, a downward displacement of air).

v. Cold, dilute potassium permanganate reacts with ethene to form______(diol, alcohol, carboxylic acid).

Give one word or phrase for the following:

i. The ratio of the mass of a certain gas to the mass of its 22.4 Lt at normal emperature and pressure

ii. Formation of ions from molecules

iii. Photolytic decomposition of aalkanes with chlorine

iv. Hydrocarbons containing a CO-O-CO functional group

v. The amount of energy released when an atom in the gaseous state accepts an electron to form an anion

Write balanced equations for the following:

i. Action of heat on a mixture of ethylene and concentrated sulphuric acid

ii. Action of warm water on magnesium nitride

iii. Action of concentrated sulphuric acid on carbon

iv. Action of dilute hydrochloric acid on sodium sulphide

v. Preparation of ethane from methyl bromide

Distinguish between the following pairs of compounds using the test given withinbrackets:

i. Iron (II) sulphate and iron (III) sulphate (using ammonium hydroxide)

ii. A lead salt and a zinc salt (using excess ammonium hydroxide)

iii. Sodium nitrate and sodium sulphite (using dilute sulphuric acid)

iv. Dilute sulphuric acid and dilute hydrochloric acid (using barium chloride solution)

v. Ethyne and ethene (using cuprous chloride solution)

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