IGCSE Chemistry: Specimen Questions with Answers 157 - 159 of 240

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Question 157

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Statement

True-False▾

Hydrochloric acid is used as a bleaching agent in the textile industry.

Answer

TRUE

Explanation

Hydrochloric acid is used in textile industries to bleach the textile and add colour to the clothes. It is also used indirectly for bleaching as hydrochloric acid is used to make bleaching powder.

So, the statement is true.

Question 158

Question

MCQ▾

The first element in group is ________.

Choices

Choice (4)

a.

Lithium

b.

Sodium

c.

Helium

d.

Beryllium

Answer

d.

Explanation

Beryllium (Be) is the very first element in group.

Beryllium (Be) is the Very First Element in 2nd Group

Question 159

Question

MCQ▾

Aliphatic compounds are those compounds which have:

Choices

Choice (4)

a.

Cyclic structure

b.

Closed chain structure

c.

Cyclic and branched chain structure

d.

Open chain structure

Answer

d.

Explanation

  • Compounds having open chain structure are known as aliphatic compounds. Open chain structures consist of straight chain structure and branched chain structure.
  • In a straight chain structure, carbon atoms are linked with each other in a straight chain by a strong covalent bond. E. g. Heptane. Its condensed formula is:
The Chain Structure of Heptane
The Open Chain Structure of 2 Methyl Propane

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