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Q.

Which of the following statements is not correct?

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a

HgSO4 is used as a catalyst in converting acetylene to acetaldehyde

b

ZnSO47H2O on strong heating gives ZnO with the liberation of SO2 and O2

c

ZnSO47H2O on heating at 373 K gives ZnSO42H2O

d

On sublimation, black variety ofHgS changes to a red variety

answer is C.

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Detailed Solution

ZnSO47H2O373K6H2OZnSO4H2O723KH2OZnSO4; 2ZnSO4 above 1000K2ZnO+2SO2+O2 

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