(A) The formation of ozone from oxygen is an endothermic reaction, not an exothermic reaction. The correct reaction is: $3 O_2 \underset{\text{silent

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$3 O_2 \underset{\text{silent electric discharge}}{\rightleftharpoons} 2 O_3 ; \Delta H = -284.5 \ kJ$

(A) The formation of ozone from oxygen is an endothermic reaction, not an exothermic reaction. The correct reaction is: $3 O_2 \underset{\text{silent electric discharge}}{\rightleftharpoons} 2 O_3 ; \Delta H = +284.5 \ kJ$. Therefore, the statement $3 O_2 \underset{\text{silent electric discharge}}{\rightleftharpoons} 2 O_3 ; \Delta H = -284.5 \ kJ$ is incorrect.

Class 12 Chemistry p-Block Elements (Class 12)Oxygen family

Medium

Which of the following is not correct?

TS EAMCET 2006 All TS EAMCET

AP EAMCET 2006 All AP EAMCET

A
$3 O_2 \underset{\text{silent electric discharge}}{\rightleftharpoons} 2 O_3 ; \Delta H = -284.5 \ kJ$
B
Ozone undergoes addition reaction with unsaturated carbon compounds.
C
Sodium thiosulphate reacts with $I_2$ to form sodium tetrathionate and sodium iodide.
D
Ozone oxidises lead sulphide to lead sulphate.