IGCSE Chemistry: Specimen Questions with Answers 149 - 150 of 240

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Question 149

Question

MCQ▾

Which statement about the substances used is correct?

Choices

Choice (4)

a.

The coating is plastic because it conducts electricity well

b.

The core is copper because it conducts electricity well

c.

The core is copper because it is cheap and strong

d.

The core is iron because it is cheap and strong

Answer

b.

Explanation

Correct Option is B i.e.. The core is copper because it conducts electricity well. Because in this metal electron move freely inside it and in this metal resistance is also less as compared to other metals.

Question 150

Question

MCQ▾

Elements in the same group have the same valency.

Choices

Choice (4)

a.

False

b.

True

c.

Sometimes false

d.

Sometimes true

Answer

b.

Explanation

Correct option is true because this is the law of general chemistry is that Elements in the same group have the same valency.

Therefore, elements whose atoms can have the same number of valence electrons are grouped together in the periodic table of the elements. As a general rule, a main group element (except hydrogen or helium) tends to react to form a closed shell, corresponding to the electron configuration s2p6.

Valence Electrons

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