IGCSE Chemistry Paper-1: Specimen Questions with Answers 31 - 32 of 99

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Question 31

Question

MCQ▾

Give example of a gas in a liquid?

Choices

Choice (4)

a.

Wine

b.

Soft drinks

c.

Sea Water

d.

All of the above

Answer

b.

Explanation

Gas in a liquid is a type of a mixture. A mixture is heterogeneous substances, ones with non-uniform composition throughout the sample.

A gas in a liquid implies a mixture which has a liquid and a gas within it. Soft drinks, such as cola, are mixtures of mainly carbon dioxide gas and water.

Question 32

Question

MCQ▾

Find correct statement regarding with elements and compounds:

Choices

Choice (4)

a.

Elements are type of pure substance whereas compounds are type of mixtures.

b.

The composition of elements varies and that of compound remains the same.

c.

An element is composed of a single kind of atom whereas A compound is composed of two or more elements in a

d.

Question does not provide sufficient data or is vague

Answer

c.

Explanation

Elements and compounds both are type of Pure substances i.e.. have a definite and constant composition. An element is composed of a single kind of atom. An atom is the smallest particle of an element that still has all the properties of the element. A compound is composed of two or more elements in a specific ratio. For example, water is a compound made up of two elements, hydrogen (H) and oxygen (O) . These elements are combined in a very specific way — in a ratio of two hydrogen atoms to one oxygen atom, known as H2O.

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