Q-1What happens when hydrogen sulphide gas is passed into an aqueous solution of copper
sulphate?
(a) Yellow precipitate of copper oxide is obtained
(b) Black precipitate of copper sulphide is obtained
(c) Displacement reaction takes place
(d) Both (b) and (c)
Q-2 On adding dilute hydrochloric acid to the reaction mixture of sodium sulphite and barium
chloride, white precipitate disappears. This is because
(a) HCl decomposes barium sulphite
(b) Barium chloride is insoluble in water
(c) displacement reaction takes place
(d) barium sulphite is a salt of strong acid
Answers
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Answer:
1 option b is the answer
2 option a is the answer
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