Question

For each questions four answers are given. Out of four
only one answer is correct. Select the correct answer :
(i) A solution reacts with crushed egg-shells to give a gas
that turns lime water milky-
(a) NaCl
(b) LiCl
(c) HCl
(d) KCl
(ii) An element ereacts with Oxygen to give a compound
with a high melting point. The compound is also
soluble in water. The element is likely to be-
(a) Calcium
(b) Carbon
(c) Silicon
(d) Iron
​

Answer 1

Answer:

(i) (c) HCl

Eggshells are made of calcium carbonate. Acids liberate carbon dioxide when they react with any carbonate. Carbon dioxide turns lime-water milky.

(ii) (a) Calcium

Calcium reacts with oxygen and forms calcium oxide which has a high melting point and shoot s insoluble in water too.

Explanation:

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