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Oxides of Sulphur

Four test tub...

Question

Four test tubes containing dil. $H C l, {B a C l}_{2}, {C d C l}_{2}$ and ${K N O}_{3}$ solution. Which of the following will identify ${B a C l}_{2}$ ?

Dil.

H_{2} {S O}_{4}

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K_{2} {C r O}_{4}

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{F e S O}_{4} / H_{2} {S O}_{4}

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{A g N O}_{3}

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Solution

The correct option is B $K_{2} {C r O}_{4}$
Ba(II) ion react with potassium chromate to give yellow precipitate of barium chromate.
$B a^{2 +} + K_{2} C r O_{4} \to B a C r O_{4} ↓ y e l l o w p r e c i p i t a t e + 2 K^{+}$
Hence, potassium chromate will idntify barium chromate.

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