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Q.

Which of the following solid salt on heating with solid $K_{2} C r_{2} O_{7}$ and cone. $H_{2} S O_{4}$ orange red vapours are evolved which turn aqueous NaOH solution yellow?

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a

$N a B r$

b

$N a C l$

c

$N a N O_{3}$

d

$N a I$

answer is B.

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Which of the following solid salt on heating with solid K2Cr2O7 and cone. H2SO4 orange red vapours are evolved which turn aqueous NaOH solution yellow?