Which one of the following statement is true for all the alkali met...

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Which one of the following statement is true for all the alkali metals?
(a) Their nitrates decompose on heating to give \( \mathrm{NO}_{2} \) and \( \mathrm{O}_{2} \) gas.
\( \mathrm{P} \)
(b) Their carbonates decompose on heating to give \( \mathrm{CO}_{2} \) and normal oxide.
W
(c) Oxide \( \left(\mathrm{M}_{2} \mathrm{O}\right) \) and peroxides \( \left(\mathrm{M}_{2} \mathrm{O}_{2}\right) \) of alkali metals are diamagnetic.
(d) All alkali metals bicarbonates exist in solid state.
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