TS EAMCET · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

Which of the following is not correct ?

A Ammonia is used as refrigerant
B A mixture of \(\mathrm{Ca}(\mathrm{CN})_2\) and \(\mathrm{C}\) is known as nitrolim
C A mixture of \(\mathrm{Ca}\left(\mathrm{H}_2 \mathrm{PO}_4\right)_2\) and \(\mathrm{CaSO}_4 \cdot 2 \mathrm{H}_2 \mathrm{O}\) is known as superphosphate of lime
D Hydrolysis of \(\mathrm{NCl}_3\) gives \(\mathrm{NH}_3\) and \(\mathrm{HOCl}\)

Verified Solution

Answer & Solution

Correct Answer

(B) A mixture of \(\mathrm{Ca}(\mathrm{CN})_2\) and \(\mathrm{C}\) is known as nitrolim

Step-by-step Solution

Detailed explanation

A mixture of calcium cyanamide \(\mathrm{CaCN}_2\) and coke (C) is called nitrolim. It is used as it fertilizer and can be prepared by passing nitrogen on \(\mathrm{CaC}_2\).

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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