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

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

Odour of a pungent smelling gas is recorded

The surface of metal becomes shining

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.

Only A

Only D

A, B

C, D

None

Corrosion in case of iron is known as

Rancidity

Combination

Reduction

Rusting

None

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

The equation has been balanced

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

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

Correct chemical formulae of reactants and products are written

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, d

C, d

A, b, c

A, c

None

Which of the following are exothermic processes?

(a) Reaction of water with quick lime

(b) Dilution of an acid

(d) Sublimation of camphor (crystals)

C, B

D, B

D, C

A, B

None

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.

(iii) and (iv)

(ii) and (iii)

(i) and (iv)

(i) and (ii)

None

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

Pink

Black

White

Yellow

None

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

Ripening of banana

Digestion of food in your stomach

Burning of candle wax when heated

Melting of candle wax when heated

None

10.

What happens when lead nitrate reacts with potassium iodide?

Yellow ppt of lead iodide and potassium nitrate will be produced

They will not react

Evolution of gas will occur

A large amount of hydrogen will be released

None

11.

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

12.

A dilute ferrous sulphate solution was gradually added to the beaker containing acidified permanganate solution. The light purple color of the solution fades and finally disappears. Which of the given equation is the correct explanation for the observation?

FeSO₄ acts as an oxidizing agent and oxidizes KMnO₄

KMnO₄ is an oxidizing agent, it oxidizes FeSO₄

The color disappears due to dilution, no reaction is involved

KMnO₄ is an unstable compound and decomposes in the presence of FeSO₄ to a colourless compound

None

13.

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?

KMnO4 is an oxidising agent, it oxidises FeSO4.

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

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

FeSO4 acts as an oxidising agent and oxidises KMNO4.

None

14.

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 two compounds react to form a single compound.1

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.

None

15.

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), (vi) and (iii)

(ii) and (iv)

(i), (ii) and (iv)

None

16.

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.

C, A

A, D

B, C

D, B

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.

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

(iv) only

(ii) and (iii)

(i) and (iii)

None

19.

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

Silver

Sodium

Aluminium

Iron

None

20.

Which of the following shows an oxidation reaction?

Gain of oxygen

None of the above

Gain of hydrogen

Loss of oxygen

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