If X is a member of chalcogen family, the chemical highest stability of `X^(2-)` is exhibited by

If X is a member of chalcogen family, the highest stability of X^(-2) is exhibited by

Which member of carbon family has the highest value of first ionisation enthalpy?

Which member of the halogen family (X) does not show oxidation state of +1?

Except _________ all members of carbon family exhibit allotropy.

Among the hydrides of the members of oxygen family, which has maximum thermal stability .

Among the hydrides of the members of oxygen family, which has (1) Lowest boiling point (ü) Highest reducing character (ii) Highest thermal stability (iv) Weakest acidic character?

(i) Which family of compounds is known as chalcogens and why ? (ii) Except fluorine, other members of the halogen family show variable oxidation states. Why ? (iii) Give the shape of S_(8) molecule in rhombic sulphur.

Which member of carbon family has the maximum tendency to exhibit catenation property?