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Assertion (A). Combustion of all organic...

Assertion (A). Combustion of all organic compounds is an exothermic reaction.
Reason (R). The enthalpies of all elements in their standard state are zero

Text Solution

Verified by Experts

The correct Answer is:
B
Correct explanation. In a combustion reaction, sum of enthalpies of reactants is greater than the sum of theenthalpied of products.
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The enthalpies of all elements in their standard states are :

Statement-1: Combustion of all organic compounds is an exothermic reaction . Statement-2: The enthalpy of formation of all elements in their standard state are zero.

The enthalpies of formation of all the elements in their standard states are

The enthalpy of any element in the standard state is taken as…………….

The enthalpies of the elements in their standard states are arbitrarily assumed to be

Knowledge Check

  • The enthalpies of all elements in their standard states are

    A
    unity
    B
    zero
    C
    `lt 0`
    D
    different for each element.

  • The enthalpies of all elements in their standard states are

    A
    less than zero
    B
    different for each element
    C
    zeor
    D
    unity

  • Statement-1: Combustion of all organic compounds is an exothermic reaction . Statement-2: The enthalpy of formation of all elements in their standard state are zero.

    A
    Statement-1 is True, Statement -2 is True, Statement-2 is a correct explanation for Statement-1.
    B
    Statement -1 is True ,Starement -2 is True ,Statement-2 is not a correct explanation for Statement-1
    C
    Statement-1 is True ,Statement-2 is False.
    D
    Statement-1 is False ,Statement-2 is True.