CBSE Class 10 Science 2020 · Paper 31/1/1 · Question 5(b)
When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is obtained and the sulphuric acid so formed remains in the solution. The reaction is an example of a :
- (a)Combination reaction
- (b)Displacement reaction
- (c)Decomposition reaction
- (d)Double displacement reaction
Answer
(d) Double displacement reaction
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