When calcium carbide is reacted with heavy water, which of the following product(s) will be formed I. $\mathrm{CD}_4$ II. $\mathrm{C}_2 \mathrm{D}_2$ III. $\mathrm{Ca}(\mathrm{OD})_2$ IV. $\mathrm{Ca}_2 \cdot \mathrm{D}_2 \mathrm{O}$

• A

  I and IV
• Correct answer
  B

  II and III
• C

  I, II and III
• D

  I, II, III and IV

Solution

Calcium carbide $\left(\mathrm{CaC}_2\right)$ is an ionic carbide, which can be written as $[: \stackrel{\ominus}{\mathrm{C}} \equiv \stackrel{\ominus}{\mathrm{C}}:] \mathrm{Ca}^{2+}$

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