Chemistry-(general)
NEET Chemistry (general) MCQ Question
Type: MCQ-conceptual-Easy-Class 11
Which of the following statements about the heat of reaction and standard enthalpy of formation is correct?
A
The standard enthalpy of formation for elements in their standard state is zero.
B
The heat of reaction is always negative for exothermic reactions.
C
The coefficients used in enthalpy calculations are not related to stoichiometric coefficients.
D
The standard enthalpy of formation for H2O(l) is positive.
Correct Answer
Option A
Detailed Explanation
According to the NCERT context, the standard enthalpy of formation (ΔfH°) for elements in their standard state is defined as zero, which is a fundamental principle in thermodynamics. Other options reflect common misconceptions about enthalpy and thermodynamic processes.
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