Fill in the blank ... 1. Common salt is ____ in water 2. The freshly sand papered surface of a metal has ___ 3. coconut oil __ on the surface of water .4. Most of the gases are ___ in water 5. Glass is a ___ substance
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Explanation:
(a) Common salt is obtained from sea-water by the process of evaporation.
(b) Rock salt is mined just like coal.
(c) Chemical formula of washing soda is Na
2
CO
3
.10H
2
O
(d) Sodium hydrogen carbonate is baking soda whereas sodium carbonate is washing soda.
(e) The chemical formula of plaster of Paris is CaSO4 .2 1 H2O.
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