Question

Write the observation for the following: [3]

a) When dilute sulphuric acid is added to an active metal.

b) When copper sulphate crystals is heated.

c) When erric chloride, a deliquescent substance, is kept unstoppered in bottle.
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Answer 1

here is ur ans

Explanation:a)-Reaction of potassium with dilute sulphuric acid: Potassium sulphate and hydrogen gas are formed when potassium reacts with dilute sulphuric acid. Reaction of magnesium metal with dilute hydrochloric acid: Magnesium chloride and hydrogen gas are formed when magnesium reacts with dilute hydrochloric acid.

b)-when blue copper sulphate crystals are heated they lose water of crystallization and blue colour of cuso4 changes to white.

c)-Most deliquescent substances are salts. While table salt or sodium chloride (NaCl) may be deliquescent if the particles are small and the humidity is very high, salt is usually considered to be hygroscopic. Because of their affinity for water, deliquescent substances find use as desiccants.

Answer 2

Explanation:

a) Reaction of potassium with dilute sulphuric acid: Potassium sulphate and hydrogen gas are formed when potassium reacts with dilute sulphuric acid. Reaction of magnesium metal with dilute hydrochloric acid: Magnesium chloride and hydrogen gas are formed when magnesium reacts with dilute hydrochloric acid.

b) when blue copper sulphate crystals are heated they lose water of crystallization and blue colour of cuso4 changes to white