A compound \( (\mathrm{X}) \) has following characteristics: (i) It is used as a water softening...

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A compound \( (\mathrm{X}) \) has following characteristics:
(i) It is used as a water softening agent.
(ii) It gives \( \mathrm{NaOH} \) on reaction with \( \mathrm{Na}_{2} \mathrm{CO}_{3} \).
(iii) Its clear solution becomes milky when \( \mathrm{CO}_{2} \) gas is passed.
(iv) It liberates ammonia gas with ammonium salts.
The compound \( (\mathrm{X}) \) is:
(a) \( \mathrm{Ca}\left(\mathrm{HCO}_{3}\right)_{2} \)
(b) \( \mathrm{Ca}(\mathrm{OH})_{2} \)
(c) \( \mathrm{CaO} \)
(d) \( \mathrm{CaCO}_{3} \)
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