Which of the following chemicals is used for poisoning the specimens in herbarium technique?

H g_{2} C l_{2}

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A g N O_{3}

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H C l

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H g C l_{2}

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Solution

The correct option is D $H g C l_{2}$
Mercuric chloride is used for poisoning specimens in herbarium technique where the specimen is dipped in the alcoholic solution of $H g C l_{2}$ and dried and fumigated before storage.
So the correct answer is "Option D".

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Which of the following metal chloride gives white ppt and black ppt respectively with aequeous solution of gas (B)

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2 H g C l_{2} + K_{2} C_{2} O_{4} \to 2 K C l + 2 C O_{2} + H g_{2} C l_{2}

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