Assertion(A): Standard enthalpy of formation of ${CO}_{2}$ is the sum of standard enthalpy of formation of carbon monoxide and standard enthalpy of combustion of carbon monoxide
Reason (R): Enthalpy change is same whether reaction takes place in one step or in a number of steps.

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Both(A) and (R)are true and (R) is the correct explanation of (A)

Both(A) and (R)are true and (R) is not the correct explanation if (A)

(A) is true but (R) is false

Both(A) and (R) are false

answer is A.

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Detailed Solution

The standard enthalpy of formation of a substance is the enthalpy change that occurs when 1 mole of the substance is formed from its constituent elements in their standard states. A pure element in its standard state has a standard enthalpy of formation of zero.

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