Which of the following point is not true about interstitial compounds?

Q. Which of the following is true for all metals?
(a) They are hard solids.
(b) They have high melting and boiling points.
(c) They have 1−3 valence electrons.
(d) They are malleable and ductile.

Q. Transition metals are hard and lustrous substances with high melting points and form highly coloured compounds. Which of the following is not transition metals?

Q. Choose the correct answer from the options given below:
(i) In the periodic table alkali metals are placed in the group ___________
(a) 1
(b) 11
(c) 17
(d) 18

(ii) Which of the following properties do not match with elements of the halogen family?
(a) They have seven electrons in their valence shell.
(b) They are highly reactive chemically.
(c) They are metallic in nature.
(d) They are diatomic in their molecular form.

Q. why group 1 element have low melting point and boiling point even though they are metals ?

Q. Many transition metals form interstitial compounds. The characteristics of these interstitial compounds are:
(I) They have high melting points, higher than those of pure metals
(II) They are very hard
(III) They retain metallic conductivity
(IV) They are chemically more reactive than the pure metals