IGCSE Chemistry Paper-1: Specimen Questions with Answers 95 - 96 of 99

Question 95

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Question

MCQ▾

Which acid is known as the king of acids?

Choices

Choice (4)
a.Acetic acid
b.Sulphuric acid
c.Hydrochloric acid
d.Nitric acid

Answer

b.

Explanation

Sulphuric acid is called the king of chemicals because it has a large number of applications. It finds applications in manufacturing either directly or indirectly. Some of the uses of sulphuric acid are: ‎‎1. It is used in the production of lead-acid batteries. ‎2. It is used for production of fertilizers. ‎3. It is widely used in chemical labs. ‎4. It is used in the manufacture of phosphate fertilizers. ‎5. It is used in petroleum refining. ‎6. It is used for production of paper.

There are tons of other uses of Sulphuric acid.

Question 96

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Question

MCQ▾

A substance X has the following properties. Name X.

  • hardest substance known to man
  • brittle (not malleable)
  • insulator (non-conductor)
  • insoluble in water
  • very high melting point

Choices

Choice (4)
a.Graphite
b.Diamond
c.Fullerenes
d.None of the above

Answer

b.

Explanation

Diamond has strong covalent bonds holding the structure together. All of the bonds are directional and stress will tend to break the structure (In a malleable substance, such as for example a metal, the bonding is non-directional and can still act if the particles are displaced with respect to one another).

All of the valence (outer shell) electrons are used in bonding. The bonds are sigma and the electrons are located between the two carbon nuclei being bonded together. None of the electrons are free to move.

There are only very weak Van der Waal’s attractions between the carbon atoms and the water molecules whereas the carbon atoms are bonded very tightly to one another.

Many strong covalent bonds holding the structure together - it requires massive amounts of energy to pull it apart

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