IGCSE Chemistry Paper-1: Specimen Questions with Answers 47 - 48 of 99

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Question 47

Question

MCQ▾

Find correct statement regarding displacement reaction?

Choices

Choice (4)

a.

placement reaction is the loss of electrons by a molecule

b.

Displacement reaction is the loss of electrons by a molecule

c.

Displacement reaction is one in which one part of a molecule is displaced by other.

d.

Displacement reaction is one in which two or more elements combines together to form a single compound

Answer

c.

Explanation

Displacement reaction is a chemical reaction in which a more reactive element displaces a less reactive element from its compound. Both metals and non-metals take part in displacement reactions.

Question 48

Question

MCQ▾

Which of the following statements are incorrect in regard to alkanes?

  1. Alkanes are saturated hydrocarbons.
  2. All the carbon atoms present are bound to each other carbon atoms by double bond
  3. All the carbon atoms present are bound to each other carbon atoms by double bond

Choices

Choice (4)

a.

Only 3

b.

1 and 3

c.

Only 2

d.

2 and 3

Answer

d.

Explanation

Alkanes are the simplest organic molecules, consisting of only carbon and hydrogen and with only single bonds between carbon atoms. Alkanes are used as the basis for naming the majority of organic compounds (their nomenclature) . Alkanes have the general formula CnH2n + 2.

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