10th Standard CBSE Science Unit 1 Chemical Reactions and Equations One Mark Question Paper | QB365

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10th Standard CBSE Science Unit 1 Chemical Reactions and Equations One Mark Question Paper

Published on: 23/08/2019

Chemical Reactions and Equations

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Questions:

Multiple Choice Question

10 x 1 = 10

The reaction of H₂ gas with oxygen gas to form water is an example of

(a)

redox reaction

(b)

combination reaction

(c)

exothermic reaction

(d)

all of these reactions

Which of the following will be required to identify the gas evolved when dilute hydrochloric acid reacts with zinc metal?

(a)

Red litmus paper

(b)

A burning splinter

(c)

Lime water

(d)

PH paper

Methane on combustion gives

(a)

neither CO₂ nor H₂O

(b)

CO₂

(c)

both CO₂ and H₂O

(d)

H₂O

Chemically rust is

(a)

only ferric oxide

(b)

hydrated ferrous oxide

(c)

hydrated ferric oxide

(d)

none of these

The chemical formula of lead sulphate is

(a)

PbSO₄

(b)

PB(SO₄)₂

(c)

Pb₂(SO₄)₃

(d)

Pb₂SO₄

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?

(a)

Lead sulphate (insoluble)

(b)

Ammonium nitrate

(c)

Lead acetate

(d)

Potassium sulphate

Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is

(a)

1 : 1

(b)

2 : 1

(c)

4 : 1

(d)

1 : 2

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

(a)

KMnO₄ is an oxidising agent, it oxidises FeSO₄

(b)

FeSO₄ acts as an oxidising agent and oxidises KMnO₄

(c)

The colour disappears due to dilution; no reaction is involved

(d)

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

Which of the following is not a physical change?

(a)

Boiling of water to give water vapour.

(b)

Melting of ice to give water.

(c)

Dissolution of salt in water.

(d)

Combustion of Liquefied Petroleum Gas(LPG).

10.

Fe₂O₃ + 2Al \(\rightarrow\) Al₂O₃ + 2Fe.
The above reaction is an example of a

(a)

Combination of reaction

(b)

Double displacement reaction

(c)

Decomposition reaction

(d)

Displacement reaction.

Generic 2

10 x 2 = 20

11.

Silver articles develop black coating and copper articles develop green coating. Which chemical phenomenon is responsible for this coating?

12.

Which term is used to indicate the development of unpleasant smell and taste in butter and oil containing food?

13.

State one basic difference between a physical change and a chemical change.

14.

Name and state the law which is kept in mind while we balance a chemical equation.

15.

Which one is a chemical change-rusting of iron or melting of iron?

16.

What is meant by a chemical reaction?

17.

Name the different forms of energy required for breaking down the reactants in decomposition reaction.

18.

Name the gas evolved when zinc reacts with dil.HCl.

19.

Give an example of photochemical reactions.

20.

What is the role of a catalyst in a chemical

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Answers Key:

Multiple Choice Question

10 x 1 = 10

(b)
combination reaction

(b)
A burning splinter

(a)
PbSO₄

(b)
Ammonium nitrate

(b)
2 : 1

(a)
KMnO₄ is an oxidising agent, it oxidises FeSO₄

(d)
Combustion of Liquefied Petroleum Gas(LPG).

10.

(d)
Displacement reaction.

Generic 2

10 x 2 = 20

11.

Silver coin with atmospheric sulphur and green coating is of copper carbonate which is formed due to the reaction of copper with moist carbon dioxide from the air.

12.

Oxidation

13.

In a physical change, no new substance is formed. In a chemical change, new substance is formed.

14.

Law of conservation of mass.
Mass can neither be created nor destroyed during a chemical reaction.

15.

Physical change:
A temporary change, in which no new substance is formed and the chemical composition of the original substance remains the same, even though some of its physical properties like color, state, shape, size, etc. may change. For example, the melting of ice.
Melting of iron is a physical change because when the iron is heated it changes from one state to other but the chemical properties remain the same.
Chemical change:
A permanent change in which new substances are formed whose chemical and physical properties are completely different from that those of the original substance. For example, the burning of fuel.
During rusting of iron the new substance i.e rust (red-brown solid) is formed when iron comes in contact with air and water.
Thus rusting of iron is a chemical change.

16.

A process in which two or more substances react to form some other new substances with new set of properties is called a chemical reaction.

17.

Heat, light and electricity.

18.

Hydrogen gas is evolved.

19.

An example of photochemical reactions is the process of photosynthesis occurring in the leaves of green plants.
\(\underset { Carbon\\ dioxide }{ { 6CO }_{ 2 } } +\underset { Water}{ { 6H }_{ 2 } O} \overset { sunlight }{ \underset { Chlorophyll }{ \rightleftharpoons } } \underset {Glucose }{ C_6H_{12}O_6 } +\underset {Oxygen }{6{ O }_{ 2 }}\)

20.

A catalyst changes the rate of reaction without taking part in the reaction itself.