MCQ
Which of the following relation is correct ?
- A$\Delta H_f^o (H_2O, l) = \Delta H_c^o (H_2, g)$
- B$\Delta H_f^o (CO_2, g) = \Delta H_c^o (C, graphite)$
- C$\Delta H_c^o (CO, g) = \Delta H_c^o(C, graphite) -\Delta H_f^o(CO, g)$
- ✓All of the above
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$I.$ $Zn +$ conc. $HNO_3$ (hot) $\rightarrow Zn(NO_3)_2 + X + H_2O$
$II.$ $Zn +$ dil. $HNO_3$ (cold) $\rightarrow Zn(NO_3)_2 + Y + H_2O$
Compounds $X$ and $Y$ are respectively
$Pt(s)|\mathop {{H_2}(g)}\limits_{1\ atm} |HA\,\,\,\,\,\mathop {1\,M}\limits_{({K_a} = {{10}^{ - 7}})} \,\,||\,HB\,\,\,\,\,\mathop {1\,M}\limits_{({K_1} = {{10}^{ - 5}})}$
$\,|\mathop{{H_2}(g)}\limits_{1\ atm} |Pi(s)$