IGCSE Chemistry: Specimen Questions with Answers 64 - 66 of 240

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Question 64

Question

MCQ▾

What are the causes of acid rain?

Choices

Choice (4)

a.

Internal Combustion engines

b.

Pollution by industries

c.

Burning of fossil fuels

d.

All a., b. and c. are correct

Answer

d.

Explanation

  • The causes of acid rain are internal Combustion engines, pollution by industries and burning of fossil fuels. These release oxides of nitrogen, sulphur etc.
  • These oxides combine with the water vapours in the atmosphere to lower the pH of rain water and cause acid rain.

Question 65

Question

MCQ▾

Some white anhydrous sulfate powder is put into a beaker of water and stirred.

What would show that the process was exothermic?

Choices

Choice (4)

a.

A blue solution is formed

b.

The beaker feels cooler

c.

The beaker feels warmer

d.

The powder dissolves in the water

Answer

a.

Explanation

Correct option is A i.e.. A blue solution is formed. Because when then the solution turns blue and a little heat is evolved so this shows that it is a exothermic process.

Question 66

Question

MCQ▾

The atomicity of sodium molecule is three.

Choices

Choice (4)

a.

One

b.

Three

c.

Four

d.

Two

Answer

a.

Explanation

The number of atoms of an element that join together to form a molecule of that element is known as atomicity of that molecule.

Sodium (Na) molecule is made of one atom of sodium. So it՚s a monatomic molecule.

So it՚s atomicity is one.

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