CIE Chemistry (US-0439): Specimen Questions with Answers 183 - 185 of 240

Question number: 183

MCQ▾

Question

The elements of which group neither donate nor accept electrons?

Choices

Choice (4) Response

a.

b.

c.

d.

Answer

c.

Explanation

  • The elements of group have valence electrons. So it is not at all easy for the elements of the group to give electrons in order to achieve octet configuration. At the same time, it is also difficult for the group elements to accommodate four extra electrons in order to achieve octet configuration. Hence they mostly share their valence electrons but do not transfer.

  • Therefore they are known as metalloids as they neither give electrons like metals not accept electrons like nonmetals.

Question number: 184

MCQ▾

Question

Complete the following reaction:

Choices

Choice (4) Response

a.

b.

c.

d.

None of the above

Answer

b.

Explanation

Water reacts with metallic oxide to give base.

So in the given reaction, calcium hydroxide is formed as the product.

Question number: 185

Short Answer Question▾

Write in Short

Alkanes and alkenes are both series of hydrocarbons.

  1. (i) Explain the term hydrocarbon.

[1 Marks]

Explanation

In organic chemistry, a hydrocarbon is an organic compound consisting entirely of hydrogen and carbon, and thus are group hydrides. Hydrocarbons, from which one hydrogen atom has been removed, are functional groups called hydrocarbyls.