A) \[C{{O}_{2}}\] is given out
B) Water vapours are given out
C) Carbon dioxide and water vapours are evolved
D) None of the above
Correct Answer: D
Solution :
Key Idea Heating effects of carbonates (i) Na, K, Rb, Cs, Fr carbonate \[\xrightarrow{\Delta }\] No gas (ii) \[{{(N{{H}_{4}})}_{2}}C{{O}_{3}}\xrightarrow{\Delta }\,\underset{\begin{smallmatrix} ammonium \\ bicarbonate \end{smallmatrix}}{\mathop{N{{H}_{4}}HC{{O}_{3}}}}\,\,\,\,+N{{H}_{3}}\] (iii) \[A{{g}_{2}}C{{O}_{3}}\xrightarrow{\Delta }4Ag+2C{{O}_{2}}+{{O}_{2}}\] \[2HgC{{O}_{3}}\xrightarrow{\Delta }2Hg+2C{{O}_{2}}+{{O}_{2}}\] (iv) Rest carbonate \[\xrightarrow{\Delta }\] Rest oxide \[+C{{O}_{2}}\] \[ZnC{{O}_{3}}\xrightarrow{\Delta }ZnO+C{{O}_{2}}\] \[L{{i}_{2}}C{{O}_{3}}\xrightarrow{\Delta }L{{i}_{2}}O+C{{O}_{2}}\] When carbonates of IA group elements are heated, there is no evolution of gas and water vapours. Only \[L{{i}_{2}}C{{O}_{3}}\] gives \[C{{O}_{2}}\] on heating.
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