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Q.

Identify the correct statement from the following

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a

Nitrates of all alkali metals give NO2 and O2 on heating

b

Except LiHCO3, all the hydrogen carbonates of alkali metals are obtained in solid form

c

Except LiCl, all the chlorides of alkali metals are deliquescent

d

Carbonates of all alkali metals give CO2  on thermal decomposition

answer is B.

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Detailed Solution

4LiNO3→∆2Li2O+4NO2↑+O2↑ 2MNO3M=Na,K,Rb,Cs→∆2MNO2+O2Lithium nitrate undergo decomposition differently when compared to the decomposition of nitrates of other alkali metal nitrates.→ LiHCO3 - It is not solid [liquid]NaHCO3,KHCO3,RbHCO3,CsHCO3 are solids→ LiCl is deliquescent,    NaCl is deliquesent due to presence of CaCl2 & MgCl2→ Na2CO3 and other corbonates can't undergo decomposition only Li2CO3 undergoes decomposition                                   Li2CO3→∆Li2O+CO2
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