- ✓Germanium
- BSodium chloride
- CSolid neon
- DCopper
Germanium and silicon are both semiconductors. They are neither conductors nor insulators. This we can study in principles of electronics.
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$A.$ Surface tension is the outcome of equal attractive and repulsion forces acting on the liquid molecule in bulk.
$B.$ Surface tension is due to uneven forces acting on the molecules present on the surface.
$C.$ The molecule in the bulk can never come to the liquid surface.
$D.$ The molecules on the surface are responsible for vapour pressure if the system is a closed system.
(Atomic number of $Zn =30,\,Ni =28$ and $Cr =24$ )
[Given : The solubility product of $Ca ( OH )_{2}$ in water $\left.=5.5 \times 10^{-6}\right]$