On heating an inorganic salt 'X' with $c o n c . H_{2} S O_{4}$ results in evolution of reddish brown fumes which on addition of $M n O_{2}$ , the fumes get intensifies. The fumes turns starch paper yellow. X is

Nitrate salt

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Bromide salt

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Fluoride salt

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Sulphate salt

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Solution

The correct option is B Bromide salt
On heating bromide salt with $c o n c . H_{2} S O_{4}$ results in evolution of reddish brown fumes of bromine in excess. This indicates the presence of $B r^{-}$ ions. Fumes gets intensified by the addition of $M n O_{2}$ to the solution.
Bromine vapours turn starch paper yellow.
Hence, A is a bromide salt.

$2 N a B r + 2 H_{2} S O_{4} \to B r_{2} + S O_{2} + N a_{2} S O_{4} + 2 H_{2} O$

$2 N a B r + M n O_{2} + 2 H_{2} S O_{4} \to N a_{2} S O_{4} + M n S O_{4} + 2 H_{2} O + B r_{2}$

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Similar questions

c o n c . H_{2} S O_{4}

M n O_{2}

K I

(A)

(B)

c o n c . H_{2} S O_{4}

C S_{2}

c o n c . H_{2} S O_{4}

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