The gas that cannot be collected over water is:

Give the chemical reaction for preparing pure $CO$.

Which of the following statements about zeolites is incorrect?

The last element of group-$14$ is found to be

Consider the following statements:
$I$. In diamond,each carbon atom is $sp^3$-hybridised.
$II$. Graphite has planar hexagonal layers of carbon atoms.
$III$. Silicones being surrounded by non-polar alkyl groups are water repelling in nature.
$IV$. The order of catenation in group $14$ elements is $Si > C > Sn > Ge > Pb$.
The correct statements are:

Amphibole silicate structure has '$x$' number of corners shared per tetrahedron. The value of '$x$' is