IGCSE Chemistry: Specimen Questions with Answers 103 - 105 of 240

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Question 103

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Short Answer▾

All metal nitrates decompose when heated. A few form a nitrite and oxygen. Most form the metal oxide, oxygen and a brown gas called nitrogen dioxide

Suggest why the nitrate of the metal, named in (a) (i) , decomposes less readily than lead (II) nitrate

[2 Marks]

Explanation

Because lead (II) nitrate is supports heating more than lithium nitrate.

Question 104

Question

MCQ▾

In the reaction between and , a pungent smelling gas is formed. Identify the gas.

Choices

Choice (4)

a.

b.

c.

d.

Answer

a.

Explanation

The reaction between and occurs as follows:

So we get , i.e.. ammonia as a gaseous product.

Now ammonia is a pungent smelling gas.

So the pungent smelling gas produced in the reaction between and is NH3.

Question 105

Statement

True-False▾

Sulphuric acid is used to make fire extinguisher.

Choices

Choice (4)

a.

False

b.

True

c.

Question does not provide sufficient data or is vague

d.

None of the above

Answer

b.

Explanation

Sulphuric acid is used to make fire extinguisher.

In the soda-acid fire extinguisher, carbon dioxide is generated by mixing sulfuric acid with a solution of sodium bicarbonate.

So, the statement is true.

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