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Q.

Which of the following sodium salts, on heating with solid K2Cr2O7 and concentrated H2SO4, gives red coloured vapours?
 

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a

NaI

b

 NaCl 

c

 NaBr 

d

NaNO2 

answer is B.

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Detailed Solution

Chromyl chloride(CrO2Cl2)

NaCl +K2Cr2O7 +H2SO4  →H2SO4 +NaHSO4 +CrO2Cl2 +H2O

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Which of the following sodium salts, on heating with solid K2Cr2O7 and concentrated H2SO4, gives red coloured vapours?