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Uses of Slaked Lime

Gas X turns l...

Question

Gas (X) turns lime water milky. Gas (X) also turns acidied $K_{2} C r_{2} O_{7}$ green. (X) is :

C O

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C O_{2}

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S O_{2}

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none of these

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Solution

The correct option is B $S O_{2}$
Gas (X) is $S O_{2}$ .
$C a (O H)_{2} + S O_{2} \to C a S O_{3} m i l k y + H_{2} O S O_{2} + C r_{2} O_{7}^{2 -} + H^{+} \to C r^{3 +} g r e e n + S O_{4}^{2 -} + H_{2} O$

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(A)

H C l - - \to

(B)

(B)

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

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O_{2}

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