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Effect on Indicators by Acids and Bases

Four test tub...

Question

Four test tubes contain $d i l . H C l$ , $K_{2} C r O_{4}$ , $C d C l_{2}$ , and $K N O_{3}$ solution. Which of the following will identify $B a C l_{2}$ ?

A

d i l . H C l

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B

K_{2} C r O_{4}

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C

N a F

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D

A g N O_{3}

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Solution

The correct option is B $K_{2} C r O_{4}$
Reaction:
$K_{2} C r O_{4} + B a C l_{2} \to B a C r O_{4}$
yellow ppt
The precipitate is insoluble in dilute acetic acid but readily soluble in mineral acids.

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