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CHEMISTRY

Chemistry
Browning of paper in old books is caused by

Collection of dust
Oxidation of cellulose
Lack of aeration
Frequent use

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Chemistry
Catalyst is a substance which

Decreases the rate of reaction
None of these
Has no action on the rate of the reaction
Increases the rate of the reaction

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Chemistry
When quick lime is added to water

No heat change takes place
Heat is liberated
Temperature decreases
Heat is absorbed

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

Iron
Silicon
Magnesium
Oxygen

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Chemistry
Which among the following is used to dilute oxygen in the gas cylinders used by divers ?

Krypton
Helium
Argon
Neon

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