Interstitial Compounds

Q. Which of the following is true about interstitial compounds

1. Interstitial compounds have the same chemical properties as that of the parent metal
2. Interstitial compounds have the same physical properties as that of the parent metal
3. As a result of filling up of interstitial spaces, these compounds becomes rigid and hard
4. Interstitial compounds have higher melting points which are higher than those of pure metals

Q.

Hydrogen is readily adsorbed by the _______ at room temperature.

1. Ammonia

2. Sulphuric Acid

3. Platinum

4. Zinc

Q. Which of the following 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. Is there any way we can tell whether an element is a metal or a non metal without looking at the periodic table? Maybe through looking at their valencies?

Q. The compound $ZnF{e}_2{O}_4$ is

1. Interstitial compound

2. Covalent compound

3. A normal spinel compound

4. Co-ordination compound

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

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

Q. The $R_f$ value of A and B in a mixture determined by TLC in a solvent are $0.65$ and $0.42$ respectively. If the mixture is separated by column chromatography using the same solvent mixture as a mobile phase, which of the two compounds, A or B will elute first? Explain.