Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as
Assertion: For the combustion of methane, \[\Delta E>\Delta H\] Reason: \[\Delta H\] is related by \[\Delta E\] by the expression. \[\Delta H=\Delta E+\Delta nRT\]A) If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
B) If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
C) If Assertion is true but Reason is false.
D) If both Assertion and Reason are false.
Correct Answer: A
Solution :
Combustion of methane is \[C{{H}_{4}}+2{{O}_{2}}\xrightarrow{{}}C{{O}_{2}}+2{{H}_{2}}O\] The relation in between \[\Delta H\] and \[\Delta E\] is \[\Delta H=\Delta E+\Delta nRT\] \[\Delta n={{n}_{p}}-{{n}_{r}}=1-3=-2\] \[\Delta H=\Delta E-2T\] So, \[\Delta H<\Delta E\] Hence, reason is correct explanation of assertion.
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