Among the following oxides of $p$-block elements,the number of oxides having amphoteric nature is: $Cl_2O_7, CO, PbO_2, N_2O, NO, Al_2O_3, SiO_2, N_2O_5, SnO_2$
- A$2$
- B$6$
- C$4$
- D$3$
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Match the following and choose the correct code.
Material Application $A$. Silicones $i$. As a catalyst $ii$. Greases $B$. Zeolites $iii$. In surgical implants $iv$. As ion exchangers
| Material | Application |
|---|---|
| $A$. Silicones | $i$. As a catalyst |
| $ii$. Greases | |
| $B$. Zeolites | $iii$. In surgical implants |
| $iv$. As ion exchangers |
The gas which turns lime water milky is:
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View SolutionThe catenation tendency of $C, Si$ and $Ge$ is in the order $Ge < Si < C$. The bond energies (in $kJ \ mol^{-1}$) of $C-C, Si-Si$ and $Ge-Ge$ bonds, respectively, are:
Bleaching powder is obtained by the action of chlorine on which of the following?
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View SolutionWhich of the following pairs of elements form amphoteric oxides?
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