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Q.

Which of the following is incorrect?

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a

3O2⇄dischargeSilent  electric2O3;  ΔH=−284.5 kJ

b

Ozone undergoes addition reaction with unsaturated hydrocarbons.

c

Sodiumthiosulphate reacts with  I2 to form sodium tetrathionate and sodium iodide.

d

Ozone oxidizes lead sulphide to lead sulphate.

answer is A.

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Detailed Solution

The formation of ozone from oxygen is an endothermic reaction not exothermic reaction. 3O2→dischargeElectric2O3 ;      ΔH=287 kJSo, statement3O2⇌dischargeSilent2O3;        ΔH=−284.5 kJ is not correct statement.
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Which of the following is incorrect?