Physics-(general)
NEET Physics (general) MCQ Question
Type: MCQ-numerical-Hard-Class 11
Calculate the standard enthalpy change for the reaction of 2 moles of CH4 (g) decomposing into carbon (C) and hydrogen (H) atoms.
A
+1665 kJ mol⁻¹
B
+3330 kJ mol⁻¹
C
-1665 kJ mol⁻¹
D
-3330 kJ mol⁻¹
Correct Answer
Option B
Detailed Explanation
From the NCERT context, the enthalpy change for CH4 (g) → C(g) + 4H(g) is +1665 kJ mol⁻¹ for 1 mole of CH4. For 2 moles, it is 2 x 1665 = +3330 kJ mol⁻¹.
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