Which of the following is the pyro silicate ion?

The three elements $X$,$Y$ and $Z$ with electronic configurations shown below all form hydrides:

Element	Electronic configuration
$X$	$1s^2, 2s^2, 2p^2$
$Y$	$1s^2, 2s^2, 2p^6, 3s^1$
$Z$	$1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 3d^{10}, 4s^2, 4p^5$

Which set of properties match correctly with properties of the hydrides of these elements?

Which of the following is not a monomer for a high molecular mass silicone polymer?

Silicon oil is obtained from the hydrolysis and polymerisation of

Explain the origin and sources of group $14$ elements.

In the following reaction,identify the nature of the product formed by the complete hydrolysis of the underlined atom at $R.T.$:
$H_2\underset{-}{S}_2O_7 + H_2O \longrightarrow 2H_2SO_4$