Give one relevant observation for the following:
(a) Sodium hydroxide is added dropwise to Calcium nitrate solution.
(b) Dilute Hydrochloric acid is added to Iron (II) sulphide.
(c) An amphoteric metal is added to hot concentrated alkali.
Give one relevant observation for the following:
(a) Sodium hydroxide is added dropwise to Calcium nitrate solution.
(b) Dilute Hydrochloric acid is added to Iron (II) sulphide.
(c) An amphoteric metal is added to hot concentrated alkali.
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Solution and Explanation
(a) Observation: A white precipitate of Calcium hydroxide [Ca(OH)_2] is formed, which is sparingly soluble in excess of sodium hydroxide.
(b) Observation: A gas is evolved which has a characteristic foul smell of rotten eggs (Hydrogen Sulphide, H_2S).
(c) Observation: The metal dissolves with brisk effervescence as a colorless, odorless gas (Hydrogen) is evolved, which burns with a 'pop' sound.
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