${C a S O}_{4}$ is insoluble but is not precipitated when excess of ${(N H}_{4})_{2} {S O}_{4}$ is added to ${C a C l}_{2}$ .
If true enter 1, else enter 0.

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Solution

Though ${C a S O}_{4}$ is insoluble but it is not precipitated when excess of ${(N H}_{4})_{2} {S O}_{4}$ is added to ${C a C l}_{2}$ . This is because calcium sulphate reacts with ammonium sulphate to give a soluble ammonium complex.
The reaction is as follows:
${C a S O}_{4} + {({N H}_{4})}_{2} {S O}_{4} ⟶ {(N H}_{4})_{2} [{C a ({S O}_{4})}_{2}]$
soluble

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