PRACTICE TEST 1 -Class 10 - Science -Chemistry -Chapter 1

Class 10 - CHEMICAL REACTION - Chemistry Mock Test.

This Test Consist of 20 Questions

Total Time - 20 -Minutes

Which of the following shows an oxidation reaction?

Loss of oxygen

Gain of oxygen

Gain of hydrogen

None of the above

None

Which among the following statement(s) is /are true? Exposure of silver chloride to sunlight for a long duration turns grey due to-

(a) The formation of silver by decomposition of silver chloride.

(b) Sublimation of silver chloride.

(d) Oxidation of silver chloride.

A, B

Only A

C, D

Only D

None

What happens when lead nitrate reacts with potassium iodide?

Evolution of gas will occur

They will not react

Yellow ppt of lead iodide and potassium nitrate will be produced

A large amount of hydrogen will be released

None

Dilute hydrochloric acid is added to granulated zinc taken in a test tube. The following observations are recorded. Point out the correct observation.

The reaction mixture turns milky

A colorless and odourless gas is evolved

The surface of metal becomes shining

Odour of a pungent smelling gas is recorded

None

The reaction in which two compounds exchange their ions to form two new compounds is called

Displacement reaction

Combination reaction

Redox reaction

Double displacement reaction

None

Which metallic spoon can be used to stir lead nitrate solution?

Silver

Aluminium

Sodium

Iron

None

A dilute ferrous sulphate solution was gradu¬ally added to the beaker containing acidified permanganate solution. The light purple colour of the solution fades and finally disap¬pears. Which of the following is the correct explanation for the observation?

FeSO4 acts as an oxidising agent and oxidises KMNO4.

KMnO4 is an unstable compound and de-composes in presence of FeSO4. to a colourless compound.

KMnO4 is an oxidising agent, it oxidises FeSO4.

The colour disappears due to dilution; no reaction is involved.

None

Which of the following statements about the given reaction are correct? 3Fe(s) + 4H₂O(g) → Fe₃O₄ (s) + 4H₂ (g)
(a) Iron metal is getting oxidized.
(b) Water is getting reduced.
(c) Water is acting as reducing agent.
(d)Water is acting as oxidizing agent.

A, b, c

A, c

A, b, d

C, d

None

A student wrote a chemical equation of the reaction between carbon monoxide and hydrogen as,

CO2 + 2H2 → CH3OH.

How can the reaction be classified?

The reaction is an example of a decomposition reaction as a compound dissociates into two compounds.

The reaction is an example of a combination reaction as a compound separates into two compounds.

The reaction is an example of a decomposition reaction as two compounds react to form a single compound.

The reaction is an example of a combination reaction as two compounds react to form a single compound.1

None

10.

In writing chemical equations, inclusion of state symbols shall be done while

The chemical formulae of products and reactants have been changed to bring about quick balancing

The equation has been balanced

The equation is being balanced to fulfill the law of conservation of mass

Correct chemical formulae of reactants and products are written

None

11.

Which of the following are exothermic processes?

(a) Reaction of water with quick lime

(b) Dilution of an acid

(d) Sublimation of camphor (crystals)

D, C

D, B

C, B

A, B

None

12.

Which among the following statement(s) is (are) true?

Exposure of silver chloride to sunlight for a long duration turns grey due to

(i) the formation of silver by decomposition of silver chloride

(ii) sublimation of silver chloride

(iii decomposition of chlorine gas from silver chloride

(iv) oxidation of silver chloride

(i) only

(i) and (iii)

(iv) only

(ii) and (iii)

None

13.

Which of the given statements is not a physical change?

Combustion of Liquefied Petroleum Gas (LPG)

Boiling of water to give water vapour

Melting of ice to give water

Dissolution of salt in water

None

14.

Solid calcium Oxide reacts vigorously with water to form calcium hydroxide accompanied by liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form its solution called lime water. Which among the following is are true about slaking of lime and the solution formed?

(a) It is an endothermic reaction.

(b) It is exothermic reaction.

(d) The pH of the resulting solution will be less than seven.

A, D

D, B

C, A

B, C

None

15.

2HNO3 + Ca (OH)2 → Ca (NO3)2 + 2H2O; is an example of

(i) displacement reaction

(ii) double displacement reaction

(iii) neutralisation reaction

(iv) combination reaction.

(ii) and (iii)

(i) and (iv)

(iii) and (iv)

(i) and (ii)

None

16.

In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the following can be used in place of lead nitrate?

Potassium sulphate

Ammonium nitrate

Lead sulphate (insoluble)

Lead acetate

None

17.

A substance X which is a group 2 element is used intensively in the cement industry. This element is present in bones also. On treatment with water, it forms a solution which turns red litmus blue. Element X is

None

18.

One of the following processes does not involve a chemical reaction, that is:

Digestion of food in your stomach

Ripening of banana

Melting of candle wax when heated

Burning of candle wax when heated

None

19.

Which of the following statements about the given reaction are correct?
3Fe (s) + 4H₂O (g) → Fe₃O₄ (s) + 4 H₂ (g)
(i) Iron metal is getting oxidised
(ii) Water is getting reduced
(iii) Water is acting as reducing agent
(iv) Water is acting as oxidising agent

(i), (ii) and (iv)

(ii) and (iv)

(i), (vi) and (iii)

None

20.

When a magnesium ribbon is burnt in air, the ash formed is

Yellow

Pink

White

Black

None

Chapter 1 - Chemical Reaction and Equation

chapter 2- Acids, Bases and Salt

Chapter 3 – Metals and Non-metals

Chapter 4 – Carbon and its Compounds

Assertion and Reason chemistry

CASE BASED QUESTIONS

Curriculum

Ncert-Class 10 Science - Chemistry

Chapter 1 - Chemical Reaction and Equation

chapter 2- Acids, Bases and Salt

Chapter 3 – Metals and Non-metals

Chapter 4 – Carbon and its Compounds

Assertion and Reason chemistry

CASE BASED QUESTIONS

PRACTICE TEST 1 -Class 10 – Science -Chemistry -Chapter 1 – Chemical Reaction and Equation