A. CuSO4
B. FeSO4
C. Na2SO4
D. PbSO4
Correct Answer: Option A
A. CuSO4
Explanation
When water is added to white coloured anhydrous copper sulphate, its colour changes to blue, indicating that the blue coloured copper sulphate pentahydrate is regenerated.
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![A quantity of hot water at 100ºC is added to 400g of water at 10ºC until the temperature of the mixture is 60ºC. Calculate the mass of the hot water added. [Specific heat capacity of water =4200JKg-1 K-1]](https://erudites.ng/wp-content/plugins/contextual-related-posts/default.png "A quantity of hot water at 100ºC is added to 400g of water at 10ºC until the temperature of the mixture is 60ºC. Calculate the mass of the hot water added. [Specific heat capacity of water =4200JKg-1 K-1]")
