IGCSE Chemistry: Specimen Questions with Answers 173 - 175 of 240

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Question 173

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Short Answer▾

Give another example of a substance other than a metal which, when finely powdered, might explode when ignited in air.

[1 Marks]

Explanation

Another example is water-reactive as well and will ignite when they contact water or humid air. They can be handled safely in atmospheres of argon or (with a few exceptions) nitrogen.

Question 174

Question

MCQ▾

________ acid is used as a cleansing agent in galvanization mixtures and for preparing some bathroom cleansing agent and in a large concentration emits fumes of chlorine gas.

Choices

Choice (4)

a.

Acetic acid

b.

Carbonic acid

c.

Sulphuric acid

d.

Hydrochloric acid

Answer

d.

Explanation

Hydrochloric acid is used as a cleansing agent in galvanization mixtures and for preparing some bathroom cleansing agent and in a large concentration emits fumes of chlorine gas.

Question 175

Question

MCQ▾

1 mole of a substance occupies a volume of

Choices

Choice (4)

a.

b.

c.

d.

All a., b. and c. are correct

Answer

d.

Explanation

  • The molar volume of a gas is 22.4 liters at STP (standard temperature and pressure) .
  • The molar volume of gas is at RTP (room temperature and pressure) .
The Molar Volume
The Molar Volume, STP

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