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CBSE Class 12 Chemistry 2017 Delhi Set 1 Solved Paper

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Question : 21 of 26
Marks: +1, -0
Give reasons:
(i) Thermal stability decreases form H2O\mathrm{H}_2\mathrm{O} to H2\mathrm{H}_2 Te.
(ii) Fluoride ion has higher hydration enthalpy than chloride ion.
(iii) Nitrogen does not form pentahalide.
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