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Question

Which of the following is correct about lunar caustic?

A
When it is heated to its melting point, it decomposes to Ag, NO2 and O2
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B
When it is heated till it gets red hot, it decomposes to AgNO2 and O2
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C
It is prepared by reacting silver with nitric acid
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D
When it is treated with KI solution, it gives a yellow coloured compound which does not dissolve in KCN solution
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Solution

The correct option is C It is prepared by reacting silver with nitric acid
AgNO3 is called lunar caustic especially when fused and molded into sticks for use as a caustic.
(a) When it is heated to its melting point, it decomposes to AgNO2 and O2.
(b) When it is heated till it is red hot, it decomposes to Ag,NO2 and O2.
(d) When it is treated with KI solution, it gives AgI, a yellow coloured compound which dissolves in KCN solution to give K[Ag(CN)2].

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