MCQ
Hess's law is used to calculate :
- ✓Enthalpy of reaction
- BEntropy of reaction
- CWork done in reaction
- DAll the above
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$(A)\,ZnO + Na_2O\rightarrow Na_2ZnO_2$
$(B)\,ZnO + CO_2\rightarrow ZnCO_3$
$C_2H_4(g) + H_2(g) \to C_2H_6(g)$
| Bond | Bond energy $(kJ)$ |
| $C-H$ | $413$ |
| $C-C$ | $348$ |
| $C=C$ | $610$ |
| $H-H$ | $436$ |

$Cr{(OH)_3} + Cl{O^ - } + O{H^ - } \to CrO_4^{2 - } + C{l^ - } + {H_2}O$
$Cr{(OH)_3}$ $-$ $Cl{O^ - }$ - $CrO_4^{2 - }$ $-$ $Cl^-$