It is observed that $Pb^{2+}$ is more stable than $Pb^{4+}$, while $Sn^{2+}$ is less stable than $Sn^{4+}$. Consider the following reactions:
$PbO_{2} + Pb \rightarrow 2PbO; \Delta_{r}G^{\circ} (1)$
$SnO_{2} + Sn \rightarrow 2SnO; \Delta_{r}G^{\circ} (2)$
Identify the correct set from the following.

  • A
    $\Delta_{r}G^{\circ}(1) > 0; \Delta_{r}G^{\circ}(2) < 0$
  • B
    $\Delta_{r}G^{\circ}(1) < 0; \Delta_{r}G^{\circ}(2) < 0$
  • C
    $\Delta_{r}G^{\circ}(1) < 0; \Delta_{r}G^{\circ}(2) > 0$
  • D
    $\Delta_{r}G^{\circ}(1) > 0; \Delta_{r}G^{\circ}(2) > 0$

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Silicon dissolves in excess of $HF$ due to the formation of:

Which species does not exist?

Match the following:
| List-$I$ | List-$II$ |
| :--- | :--- |
| $A$. Carbon black | $I$. Electrodes in batteries |
| $B$. Graphite | $II$. Extraction of metals |
| $C$. Diamond | $III$. Abrasive |
| $D$. Activated charcoal | $IV$. Filler in automobile tyres |
| | $V$. Air conditioning system |

$C_{60}$ (Buckminsterfullerene) consists of which of the following?

In the laboratory,silicon can be prepared by the reaction:

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