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Sam carried a reaction between copper sulphate solution and sodium carbonate solution in a closed container and recorded the following observations. which

of the following observations is incorrect ?
(a) Law of conservation of mass is obeyed in the reaction
(b) Blue precipitate of copper carbonate is formed
(c) Blue precipitate of sodium sulphate is formed
(d) Vigorous reaction takes place


CuSO_{4} +Na _{2} CO_{3} =CuCO_{3}| +Na _{2}SO _{4}
     blue                          grass green    white solution 
| = precipitate
Hence (b) is incorrect.
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