On treating a compound with warm dil. $H_{2} S O_{4},$ gas $X$ is evolved which turns $K_{2} C r_{2} O_{7}$ paper acidified with dil. $H_{2} S O_{4}$ to a green compound $Y .$ $X$ and $Y$ respectively are:

$X = S O_{2}, Y = C r_{2} {(S O_{4})}_{3}$

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$X = S O_{2}, Y = C r_{2} O_{3}$

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$X = S O_{3}, Y = C r_{2} O_{3}$

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$X = S O_{3}, Y = C r_{2} {(S O_{4})}_{3}$

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Solution

The correct option is A
$X = S O_{2}, Y = C r_{2} {(S O_{4})}_{3}$

$N a_{2} S O_{3} + H_{2} S O_{4} \to N a_{2} S O_{4} + H_{2} O + S O_{2} ↑ (X)$
$3 S O_{2} (X) + K_{2} C r_{2} O_{7} + H_{2} S O_{4} \to C r_{2} {(S O_{4})}_{3} (Y) + K_{2} S O_{4} + H_{2} O$

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Similar questions

Q. A gas when passes through

K_{2} C r_{2} O_{7}

and dil.

H_{2} S O_{4}

solution turns it green, the gas is:

$X + H_{2} S O_{4} \to Y$
$Y + K_{2} C r_{2} O_{7} +$ $H_{2} S O_{4} \to$ Green solution.
$Y$ is a colorless gas with irritating smell.
$X$ and $Y$ are respectively:

Q. A solution of

K_{2} C r_{2} O_{7}

acidified with

H_{2} S O_{4}

when treated with a substance 'X', gives a blue coloured solution of 'Y'. The substance 'X' and the oxidation state of central atom of compound 'Y' are respectively:

[X] + H_{2} S O_{4} \to [Y]

; a colourless gas with irritating smell

[Y] + K_{2} C r_{2} O_{7} + H_{2} S O_{4} \to

Green solution

[X]

and

[Y]

are:

Q. A salt on reaction with dil.

H_{2} S O_{4}

produces a colourless gas which turns lime water milky and an acidified orange coloured potassium dichromate solution green. The salt may be:

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On treating a compound with warm dil. H2SO4, gas X is evolved which turns K2Cr2O7 paper acidified with dil. H2SO4 to a green compound Y. X and Y respectively are:

The correct option is A X=SO2,Y=Cr2(SO4)3 Na2SO3+H2SO4→Na2SO4+H2O+SO2↑(X) 3SO2(X)+K2Cr2O7+H2SO4→Cr2(SO4)3(Y)+K2SO4+H2O

On treating a compound with warm dil. $H_{2} S O_{4},$ gas $X$ is evolved which turns $K_{2} C r_{2} O_{7}$ paper acidified with dil. $H_{2} S O_{4}$ to a green compound $Y .$ $X$ and $Y$ respectively are:

The correct option is A
$X = S O_{2}, Y = C r_{2} {(S O_{4})}_{3}$

$N a_{2} S O_{3} + H_{2} S O_{4} \to N a_{2} S O_{4} + H_{2} O + S O_{2} ↑ (X)$
$3 S O_{2} (X) + K_{2} C r_{2} O_{7} + H_{2} S O_{4} \to C r_{2} {(S O_{4})}_{3} (Y) + K_{2} S O_{4} + H_{2} O$