MCQ
Correct formula of calomel is
- ✓$H{g_2}C{l_2}$
- B$HgC{l_2}$
- C$HgC{l_2}.{H_2}O$
- D$HgS{O_4}$
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
$CH_{4(g)} + 2O_{2(g)} \rightleftharpoons CO_{2(g)} + 2H_2O_{(l)},$
$\Delta H_r = -170.8 \, k\,J\,mol^{-1}.$ which of the following statements is not true ?
| Column-$I$ | Column-$II$ |
| $(A)$ $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4\left(\mathrm{H}_2 \mathrm{O}\right)_2\right] \mathrm{Cl}_2$ | $(p)$ geometrical isomers |
| $(B)$ $\left[\mathrm{Pt}\left(\mathrm{NH}_3\right)_2 \mathrm{Cl}_2\right]$ | $(q)$ paramagnetic |
| $(C)$ $\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_5 \mathrm{Cl}\right] \mathrm{Cl}$ | $(r)$ diamagnetic |
| $(D)$ $\left[\mathrm{Ni}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right] \mathrm{Cl}_2$ | $(s)$ metal ion with $+2$ oxidation state |
$MgO(s) + C(s) \to Mg(s) + CO(g)$, for which $\Delta _r{H^o} = + 491.1\,kJ\,mo{l^{ - 1}}$ and $\Delta _r{S^o} = 198.0\,Jk^{-1}\,mo{l^{ - 1}}$ is not feasible at $298\, K$. Temperature above which reaction will be feasible is.....$K$