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Standard XII

Chemistry

Addition of Sulphuric Acid and Water

A substance ...

Question

A substance $X$ , when heated with $Y$ produces residue and odorless gas which turns lime water milky. Silver nitrate is added to the residue and yellow precipitate is formed. $X$ and $Y$ could be, respectively :

M n O_{2}

and

S

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N a B r O_{3}

and

C

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K I

and

S

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N a_{2} S O_{4}

and

C

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Solution

The correct option is B $N a B r O_{3}$ and $C$
When $N a B r O_{3}$ reacts with carbon, sodium bromide (residue) and $C O_{2}$ gas is liberated which turns limewater milky. When silver nitrate is added to the residue, yellow precipitate of silver bromide is formed.
$2 N a B r O_{3} + 2 C \to 2 N a B r + 3 C O_{2} ↑$
$2 N a B r + A g N O_{3} \to A g B r ↓ (yellow ppt) + N a N O_{3}$

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A substance X, when heated with Y produces residue and odorless gas which turns lime water milky. Silver nitrate is added to the residue and yellow precipitate is formed. X and Y could be, respectively :

A substance $X$ , when heated with $Y$ produces residue and odorless gas which turns lime water milky. Silver nitrate is added to the residue and yellow precipitate is formed. $X$ and $Y$ could be, respectively :