Consider these statements: (i) germanium is a metalloid; (ii) tin shows allotropy (grey and white forms); (iii) the +4 state is more stable than the +2 state for lead; (iv) $\mathrm{SiCl}{}_4$ is readily hydrolysed but $\mathrm{CCl}{}_4$ is not; (v) like $\mathrm{SiO}{}_2$, solid $\mathrm{CO}{}_2$ has a giant covalent network. The number of correct statements is

(i) true: Ge is a metalloid. (ii) true: grey (alpha) and white (beta) tin. (iii) false: because of the inert pair effect Pb(II) is more stable. (iv) true: Si can use vacant $d$ orbitals (or expand its coordination) to accept water, whereas C cannot. (v) false: solid $\mathrm{CO}{}_2$ is a molecular solid. Hence three are correct: (i), (ii) and (iv).