Interstitial Compounds

Q.

Which element of group $17$ undergoes sublimation?

Q. Which of the following is/are true for interstitial compounds:

1. Small atoms like hydrogen, boron etc. occupy the interstitial holes in a metal lattice.
2. These compounds are non-stoichiometric and cannot be decisively classified as ionic or covalent.
3. The formulae do not correspond to any normal oxidation state of the metal.
4. These compounds have the same appearance as that of the parent metal.

Q. In Nessler’s reagent, the active ion is:

1. $A{g}^{+}$
2. $H{g}^{2+}$
3. $[Hg{I}_3{]}^{-}$
4. $[Hg{I}_4{]}^{2-}$

Q. In Nessler’s reagent, the active ion is:

1. $A{g}^{+}$
2. $H{g}^{2+}$
3. $[Hg{I}_3{]}^{-}$
4. $[Hg{I}_4{]}^{2-}$

Q. Which of the following statement is wrong about intersititial compounds?

1. they are very hard
2. they retain metallic conductivity
3. their melting points are lower than those of pure metals
4. they are chemically inert.