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NCERT Exemplar · Class 9 · Science

Chapter 2: Is Matter around Us Pure?

Practice each question, then open the answer or worked solution.

Short Answer Questions

23 questions
Q30Written answer

Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.

(a) Name a lustrous non-metal.

(b) Name a non-metal which exists as a liquid at room temperature.

(c) The allotropic form of a non-metal is a good conductor of electricity. Name the allotrope.

(d) Name a non-metal which is known to form the largest number of compounds.

(e) Name a non-metal other than carbon which shows allotropy.

(f) Name a non-metal which is required for combustion.

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Worked solution

a) Iodine is a lustrous non-metal.

b) Bromine is liquid at room temperature

c) Graphite is an allotropic form of Carbon (non-metal), which is a good conductor of electricity.

d) Carbon is a non-metal which can form the largest number of compounds.

e) Sulphur and Phosphorous are the non-metals which show allotropy.

f) Oxygen is a non-metal which is required for combustion.

Q31Written answer

Classify the substances given in Fig. 2.2 into elements and compounds

Elements and compounds

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Worked solution

Elements-Copper(Cu), Zinc(Zn), Oxygen(O2), Fluoride(F2), Mercury(Hg), Diamond

Compounds-NACL(Aq), Wood, Sand, H2O, CaCO3

Q32Multiple choice

Which of the following are not compounds?

(e) Aluminium

(f) Iodine

(g) Carbon

(h) Carbon monoxide

(i) Sulphur powder

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Correct option: A
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Worked solution

a.Chlorine gas

c.Iron

e. Aluminium

f. Iodine

g.Carbon

i.Sulphur powder