$SnCl_2$ acts as a reducing agent because:

Which substance is used to produce smoke screens?

‘Lead pencil’ contains

In the carbon family,elements other than carbon do not form $p\pi-p\pi$ bonds because their atomic radii are very ........

$(Me)_2SiCl_2$ on condensation after hydrolysis will produce

Given below are two statements:
Statement $I$ : $SiO_2$ and $GeO_2$ are acidic while $SnO$ and $PbO$ are amphoteric in nature.
Statement $II$ : Allotropic forms of carbon are due to property of catenation and $p \pi-d \pi$ bond formation.
In the light of the above statements,choose the most appropriate answer from the options given below: