NEETChemistry-Thermodynamics
NEET Chemistry Hess's Law MCQ Question
Type: MCQ-numerical-Medium-Class 11
On the basis of thermochemical equations (1), (2) and (3), find out which of the relationships given in options (a) to (d) is correct
- C(graphite) + O₂(g) → CO₂(g); ΔH = x kJmol⁻¹
- C(graphite) + 1/2 Ω₂(g) → CO(g); ΔH = y kJmol⁻¹
- CO(g) + 1/2 Ω₂(g) → CO₂(g); ΔH = z kJmol⁻¹
A
z = x + y
B
x = y − z
C
x = y + z
D
y = 2z − x
Correct Answer
Option 3
Detailed Explanation
According to Hess's law, the enthalpy change for the overall reaction is the sum of the enthalpy changes for the individual steps: x = y + z.
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