Chemistry - General Knowledge Questions and Answers

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An oxidising agent is a

An electron acceptor

An electron donor

In a chemical reaction its oxidation number increases

It releases H₂ in a chemical reaction

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Silver gets corroded due to ________ in air.

Oxygen

Hydrogen Sulphide

Carbon dioxide

Nitrogen

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Which of the following causes the rusting of iron?
a. Oxidation
b. Reduction
c. Chemical reaction with oxygen
d. Chemical reaction with CO²

A and B

B and C

C and D

A and C

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Photo-oxidation process is initiated by

Light

Heat

Oxygen

Catalyst

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Copper substances when exposed to air gains a green coating due to the formation of:

CuO

CuCO₃ Cu(OH)₂

CuSO₄

Cu(NO₃)₂

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Browning of paper in old books is caused by

Frequent use

Lack of aeration

Collection of dust

Oxidation of cellulose

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Catalyst is a substance which

Increases the rate of the reaction

Decreases the rate of reaction

Has no action on the rate of the reaction

None of these

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When quick lime is added to water

Heat is liberated

Heat is absorbed

Temperature decreases

No heat change takes place

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What is the element that is in the highest percentage in the composition of the earth ?

Silicon

Oxygen

Magnesium

Iron