Which of the following is not correct ?

• A

  Ammonia is used as refrigerant
• Correct answer
  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 $\mathrm{HOCl}$

Solution

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 $\mathrm{CaC}_2$.

Hence, the correct answer is option: 'B'.