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Three thermochemical equation are given below: (i) underset kJJ mol^-1 C_ (graphite) + O_2( ~g) → CO_2(g) Δ H°=x (iii) CO_( gJ)+1 / 2 O_2( gk → CO_2(…

NEET UG 2013 — Chemistry Physical Chemistry

2013mcqeasy

Three thermochemical equation are given below: (i) C(graphite) kJJmol−1+O2( g)→CO2(g)ΔH∘=x\underset{\mathrm{kJJ} \mathrm{mol}^{-1}}{\mathrm{C}_{\text {(graphite) }}}+\mathrm{O}_{2(\mathrm{~g})} \rightarrow \mathrm{CO}_{2(g)} \Delta \mathrm{H}^{\circ}=xkJJmol−1C(graphite) ​​+O2( g)​→CO2(g)​ΔH∘=x (iii) CO(gJ)+1/2O2(gk→CO2( g)iΔH∘=z\mathrm{CO}_{(\mathrm{gJ})}+1 / 2 \mathrm{O}_{2(\mathrm{gk}} \rightarrow \mathrm{CO}_{2(\mathrm{~g}) i} \Delta \mathrm{H}^{\circ}=\mathrm{z}CO(gJ)​+1/2O2(gk​→CO2( g)i​ΔH∘=z Based on the above equations, find out which of the relationship given below is correct.

Official previous-year question

Held on 30 Apr 2013 · Verified 9 Jul 2026.

Options

  1. A

    z=x+yz=x+yz=x+y

  2. B

    x=y+zx=y+zx=y+z

  3. C

    y=2z−xy=2 z-xy=2z−x

  4. D

    x=y−zx=y-zx=y−z

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