MCQ
Silicon dissolves in excess of $HF$ due to formation of
- A$SiF_4$
- B$SiH_4$
- C$H_2SiF_6$
- D$H_2SiF_4$
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| column $I$ Metals | column $II$ Coordination compounds |
| $a.$ $Co$ | $i.$ Wilkinson catalyst |
| $b.$ $Zn$ | $ii.$ Chlorophyll |
| $c.$ $Rh$ | $iii.$ Vitamin $B_{12}$ |
| $d.$ $Mg$ | $iv.$ Carbonic anhydrase |
${H_2}O\left( g \right) + C\left( s \right) \to CO\left( g \right) + {H_2}\left( g \right);\Delta H = 131\,kJ$
$CO\left( g \right) + \frac{1}{2}{O_2}\left( s \right) \to C{O_2}\left( g \right);\Delta H = - 282\,kJ$
${H_2}\left( g \right) + \frac{1}{2}{O_2}\left( s \right) \to {H_2}O\left( g \right);\Delta H = - 242\,kJ$
$C(s) + O_2(g) \to CO_2(g); \Delta H = X\,kJ$
The value of $X$ will be......$kJ$