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Alkali metals readily react with oxyacids forming corresponding salts like \( \mathrm{M}_{2} \mathrm{CO}_{3}, \mathrm{MHCO}_{3}, \mathrm{MNO}_{3}, \mathrm{M}_{2} \mathrm{SO}_{4} \) etc. with evolution of hydrogen. They also dissolve in liquid \( \mathrm{NH}_{3} \) but without the evolution of hydrogen. The colour of its dilute solution is blue but when it is heated and concentrated then its colour becomes bronze.
Among the carbonates of alkali metals which one has highest stability?
(A) \( \mathrm{Cs}_{2} \mathrm{CO}_{3} \)
(B) \( \mathrm{Rb}_{2} \mathrm{CO}_{3} \)
(C) \( \mathrm{K}_{2} \mathrm{CO}_{3} \)
(D) \( \mathrm{Na}_{2} \mathrm{CO}_{3} \)
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