Interstitial Compounds

Q. A metal nitrate reacts with KI to give a black precipitate which on addition of excess of KI convert into orange solution. The cation of the metal nitrate is

1. 
2. 
3. 
4. 

Q.

What are the interstitial compounds? Why, arc such compounds well known for transition metals?

Q. Consider the complexes $\left(I\right)[MnC{l}_6{]}^{3–},$ $\left(II\right)[Fe{F}_6{]}^{3–}$ and $\left(III\right)[Co{F}_6{]}^{3–}$. Then the correct order of their magnetic moment (spin only) is correctly represented in

1. $I=III<II$
2. $I=II=III$
3. $I=II>III$
4. $I=III<II$

Q.

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

1. They retain metallic conductivity.

2. They have high melting points.

3. They are very hard

4. They are highly reactive.

Q.

What is meant by Hydronium ion?

Q. An element has a primitive cubic structure with unit cell edge length of $272\text{pm}$. The atomic radius is:

1. $\frac{\sqrt{2}}{4}\times 272\text{pm}$
2. $\frac{4}{\sqrt{3}}\times 272\text{pm}$
3. $\frac{1}{\sqrt{2}}\times 272\text{pm}$
4. $\frac{1}{2}\times 272\text{pm}$

Q. Which of the following are interstitial carbides?

1. $ZrC$
2. $VC$
3. $WC$
4. $Ca{C}_2$

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 is/are 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. Solid Phosphorus pentachloride shows some ionic character. Give reason.

Q.

2. One molecule of an ic acid of a non-metal having 5 electrons in valence shell reacts with a molecule of base to form a salt X. The base corresponds to the metal with one electron in valence shell. If the salt so formed can react with the same base in 1:2 ratio, predict the formula of the salt X.

1. K₂SO₄

2. Na₂HPO₄

3. KH₂PO₄

4. Na₃PO₄

Q. In a face centered cubic lattice, atom $\left(A\right)$ occupies the corner positions and atom $\left(B\right)$ occupies the face centre positions. If one atom of $\left(B\right)$ is missing from one of the face centered points, the formula of the compound is:

1. $A_2{B}_5$
2. $A_2{B}_3$
3. $A{B}_2$
4. $A_{2}B$

Q. Which of the following is/are interstitial carbides?

1. $ZrC$
2. $VC$
3. $WC$
4. All of the above.

Q. Which of the following atoms is not used in the formation of interstitial compounds of transition metals?

1. $H$
2. $C$
3. $O$
4. $Cl$

Q. Why d-block element form complexes?

1. due to larger size and higher nuclear charge
2. due to small size and low nuclear charge
   
3. none of the above
4. due to small size and higher nuclear charge
   

Q. Many transition metals from interstial compounds. Which of the following characteristics of these interstitial compounds is/are correct :
$\left(I\right)$ They have high melting points, higher than those of pure metals

$\left(II\right)$ They are very hard

$\left(III\right)$ They retain metalic conductivity

$\left(IV\right)$ They are chemically more reactive than the pure metals

1. $I,II,III$
2. $I,III$
3. $II,IV$
4. $IV$ only

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

1. A normal spinel compound

2. Interstitial compound

3. Covalent compound

4. Co-ordination compound

Q.

What are interstitial compounds? Why are such compounds well known for

transition metals?

Q. D - block elements are very useful as catalysts – True or False?

1. False
2. True

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. The spin only magnetic moment value (in Bohr magneton units) of $Cr(CO{)}_6$ is:

1. $0$
2. $2.84$
3. $4.90$
4. $5.92$

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

1. A normal spinel compound

2. Interstitial compound

3. Covalent compound

4. Co-ordination compound

Q. Interstitial compounds are:

1. non-stoichiometric and are ionic in nature
2. non-stoichiometric and are neither typically ionic nor covalent in nature
3. non-stoichiometric and are covalent in nature
4. stoichiometric and are neither ionic nor covalent in nature

Q. Fill in the blanks.
____________ sulphur has no sharp melting point.

Q.
Product (S) shows white precipitate:

1. After 5 min
2. No reaction
3. No ppt. at room temperature
4. Immediately

Q.

Which of the following elements form interstitial compounds?

1. Alkali metals
2. Halogens
3. Noble gases
4. Transition 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

1. $I,II,III$
2. $II,IV$
3. $I,II$
4. $IV$ only

Q. A sulphate of a metal (M) on healing evolves two gases (B) and (C) and an oxide (D). Gas (B) turns acidified dichromate paper green while gas (C) forms a trimer. Compound (D) forms a Lewis acid (E) with HCl (g).
If, the number of S -S bonds in trimer of gas (C) be 'n' and the number of equivalent M-Cl bonds in one molecule of anhydrous (E) be 'm', Then, (m + n) is:

Q. Interstitial compounds are formed when small atoms are dropped under the curved lattice of metals. Whether the following is not the characteristics property of interstitial compounds?
[1 mark]

1. They have higher melting points than the pure metals
2. They are very hard
3. They retain metallic conductivity
4. They are chemically very reactive

Q. How many ions are produced from $\left[Co\right(N{H}_3{)}_6]C{l}_3$ in solution?

1. 4
2. 2
3. 3
4. 6