Chemistry
The figure shown below demonstrates the solubility curve of a substance. From the statements given below, choose which is/are correct :
P — A is hydrated sodium chloride, B is anhydrous sodium chloride.
Q — A is Glauber's salt, B is sodium sulphate.
R — A is Gypsum, B is calcium sulphate.
- Only P
- Only Q
- Only R
- Both P and R
Water
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Answer
Only R
Reason — A is Glauber's salt and B is sodium sulphate because the solubility curve of Na2SO4.10H2O (Glauber's salt) rises till it reaches 32.8°C, and then it falls slightly. This is because Na2SO4.10H2O is hydrous below 32.8°C and anhydrous above it.
Whereas solubility curve of sodium chloride and gypsum are almost flat, showing minimal change in solubility as temperature rises.
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