Question

7. The compound used as common salt is
(a) sodium chloride
(b) calcium chloride
(c) sodium oxide
(d) hydrogen chloride
8. Brass and bronze are
(a) elements (b) mixtures
(c) compounds (d) all of the above
9. Sand is a compound of
(a) silicon and nitrogen
(b) silicon and oxygen
(c) oxygen and sulphur
(d) none of the above
10. From the list given below select the correct substance
which is most suitable to the statements given :
(oxygen, diamond, zinc, graphite, gold]
(a) A metal which is brittle.
(b) A non-metal which is a good conductor of
electricity
(c) The hardest naturally occurring substance.
(d) The most ductile metal.
(e) A gaseous non-metal.​

Answer 1

Answer:

7) Sodium-Chloride

8)Mixtures

9)silicon dioxide

Explanation:

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Answer 2

Answer:

7.(a)

8.(a)

9.(b)

10.(a)-zinc

(b)-graphite

(c)-diamonds

(d)-gold

(e)-oxygen