Q-1. Name the following.
a. An acidic hygroscopic substance.
b. On heating, this salt changes from green to black.
c. Two gases- one of which is basic and which combine to give a solid.
d. Process used for obtaining highly electropositive metals.
e. Acid used in electrolysis of water.
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Answer:
Take three small pieces of red litmus paper. Put one drop each of the given solutions on these litmus papers.
The liquid which turns red litmus into blue is a basic solution.
Divide the blue litmus paper so formed into two parts. Put one drop each of the other two liquids separately on these two pieces of litmus paper.
The solution which turns blue litmus paper red is acidic solution.
The solution which does not affect the colour of litmus paper is water.
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Answer:
1.sulfuric acid
2.Iron sulphate
3.Hydrogen chloride gas and ammonia gas.
4.electrolysis of their fused salts.
5.sulfuric acid solution
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