Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
Name a non-metal which is known to form the largest number of compounds. (Nitrogen/ Carbon)

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Important Questions on Is Matter Around Us Pure?

EASY

9th CBSE

IMPORTANT

Core science chemistry>Chapter 2 - Is Matter Around Us Pure?>EXERCISE 2D>Q 4

Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
Name a non-metal other than carbon which shows allotropy. (Sodium/ Phosphorus)

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9th CBSE

IMPORTANT

Core science chemistry>Chapter 2 - Is Matter Around Us Pure?>EXERCISE 2D>Q 4

Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
Name a non-metal which is required for combustion. (Nitrogen/ Oxygen)

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IMPORTANT

Core science chemistry>Chapter 2 - Is Matter Around Us Pure?>EXERCISE 2D>Q 1

Classify the following substances as mixtures and compounds:
Milk, water, copper sulphate, sugar solution, brass, lead nitrate, ice-cream, muddy water, iron sulphide, carbon dioxide.

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9th CBSE

IMPORTANT

Core science chemistry>Chapter 2 - Is Matter Around Us Pure?>EXERCISE 2D>Q 2

Give the names of elements represented by the following symbols and classify them as
(i) metals,
(ii) non-metals which are chemically active,
(iii) non-metals which are chemically inactive :
(a) Cr,
(b) Na,
(c) S,
(d) P,
(e) Rn,
(f) CI,
(g) Pb,
(h) Si,
(i) Mg,
(j) W,

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9th CBSE

IMPORTANT

Core science chemistry>Chapter 2 - Is Matter Around Us Pure?>EXERCISE 2D>Q 3

Give the symbols of elements listed below and classify them as:
(i) metals
(ii) reactive non-metals
(iii) non-reactive non-metals
(a) krypton
(b) potassium
(c) copper
(d) carbon
(e) tin
(f) iodine
(g) neon
(h) mercury
(i) nitrogen
(j) zinc.

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9th CBSE

IMPORTANT

Core science chemistry>Chapter 2 - Is Matter Around Us Pure?>EXERCISE 2D>Q 4

What do you understand by the term symbol of an element?

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9th CBSE

IMPORTANT

Core science chemistry>Chapter 2 - Is Matter Around Us Pure?>EXERCISE 2D>Q 4

Write the names and symbols of two elements, which are represented by the first letter of English name.

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9th CBSE