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Preparations and Uses of Caustic Soda

An orange sol...

Question

An orange solid on heating gives a colourless gas where as a green solid can be reduced to metal by aluminium powder. The orange and green solids respectively are:

A

(N H_{4})_{2} C r_{2} O_{7} & C r_{2} O_{3}

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B

N a_{2} C r_{2} O_{7} & C r_{2} O_{3}

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C

K_{2} C r_{2} O_{7} & C r O_{3}

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D

(N H_{4})_{2} C r O_{4} & C r O_{3}

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Solution

The correct option is A $(N H_{4})_{2} C r_{2} O_{7} & C r_{2} O_{3}$
Conceptual
$(N H_{4})_{2} C r_{2} O_{7} Δ - \to N_{2} + C r_{2} O_{3} + 4 H_{2} O$
Colourless green
gas solid

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