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Question

Choose the correct statement(s):


A
Oxides of Ag and Hg can be reduced on heating
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B
CsI3(s) is thermodynamically more stable than NaI3(s)
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C
Roasting is a cause of acid rain
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D
Graphite is thermodynamically more stable than diamond
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Solution

The correct options are
A Oxides of Ag and Hg can be reduced on heating
B CsI3(s) is thermodynamically more stable than NaI3(s)
C Roasting is a cause of acid rain
D Graphite is thermodynamically more stable than diamond
The oxides of metal like Ag and Hg can be reduced by heating.
2HgOHeating−−−−2Hg+O2
2Ag2OHeating−−−−4Ag+O2

CsI3(s) is thermodynamically more stable than NaI3(s) because the anion and the cation in the case of CsI3(s) is of comaprable size. Whereas, for NaI3(s) the difference in size is very high.

Roasting releases SO2 which is responsible for acid rain.

Graphite contains one delocalised electron per carbon. This causes a greater attraction between the carbon atoms thereby giving stronger bonds, and more stability to the structure. Graphite has greater van der Walls' forces.
Diamond, on the other hand, does not contain any delocalised electrons.

Chemistry

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