Examples of Ionic Compounds

Q.

Number of atoms per unit cell if atoms are present at the corner of the unit cell and two atoms at each body diagonal

Ans: 9

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Q.

Give the IUPAC name of ${\mathrm{K}}_3\left[\mathrm{Cr}{\left({\mathrm{C}}_2{\mathrm{O}}_4\right)}_3\right]$

Q. AB has NaCl type structure. If edge length of crystal lattice is 141A^°. The radius of A+ approximately is. 1} 2.5 2}20.6 3} 32 4} 28.3

Q. What is the difference between ccp and hcp?

Q. In which of the following crystals alternate tetrahedral voids are occupied

1. $NaCl$
2. $ZnS$
3. $Ca{F}_2$
4. $N{a}_{2}O$

Q. Sodium crystallizes in a bcc unit cell. Calculate the approximate number of unit cells in 9.2grams of sodium.

Q.

The unit cell of a NaCl lattice

1. Has 4NaCl units

2. Is electrically charged

3. Hasions

4. Is body centered cube

Q.

Number of atoms per unit cell, if atoms are present at the corner of unit cell and two atoms at each body diagonal

Q.

In a face centred cubic cell, an atom at the face contributes to the unit cell

[Karnataka (Engg./Med.) 2000; AFMC 2001]

1. 1/2 part

2. 1/4 part

3. 1/8 part

4. 1 part

Q.

The number of atoms per unit cell in a primitive unit cell is:

1. 1

2. 8

3. 6

4. 12

Q.

In a normal spinel type structure, the oxide ions are arranged in ccp whereas $\frac{1}{8}$ tetrahedral holes are occupied by $Z{n}^{2+}$ ions and 50% of octahedral holes are occupied by $F{e}^{3+}$ ions. The formula of the compound is ?

1. $Z{n}_{2}F{e}_2{O}_4$

2. $ZnF{e}_2{O}_3$

3. $Z{n}_{2}F{e}_2{O}_4$

4. $Z{n}_{2}F{e}_2{O}_2$

Q. What is the minimum distance between two $N{a}^{+}$ ions which are present along the edges in an ideal NaCl type crystal? Let, $r_{N{a}^{+}}$= radius of Na ⁺ and $r_{C{l}^{-}}$= radius of $C{l}^{-}$.

1. $2r_{C{l}^{-}}$
2. $\sqrt{2}\times (r_{N{a}^{+}}+r_{C{l}^{-}})$
3. 
   $2\left(r_{N{a}^{+}}\right)$
4. $2\times (\sqrt{2}+1)r_{N{a}^{+}}$

Q. $F{e}_3{O}_4$ has inverse spinel structure. What is not true about this solid?

1. $F{e}^{3+}$ ions are equally distributed between octahedral and tetrahedral voids
2. Tetrahedral voids are equally distributed between $F{e}^{2+}$ and $F{e}^{3+}$
3. Number of $O^{-2}$ >$F{e}^{3+}$ > $F{e}^{2+}$
4. Coordination number of $F{e}^{3+}$ = 8 throughout the unit cell

Q.

What type of lattice is found in potassium chloride crystal

[MP PMT 1996]

1. Face centred cubic

2. Body centred cubic

3. Simple cubic

4. Simple tetragonal

Q. For a given solid, the following arrangement of particles is observed :


Choose the property that is represented by the above arrangement of solid particles along AB and CD direction :

1. Isotropy
2. Anisotropy
3. Amorphous nature
4. None of the above

Q. 4. A solid AB has ZnS-type structure. If the edgelength of the unit cell is 400 pm and the radius ofion is 0.130 nm then the radius of A+ ion is1 43.2 pm

Q.

What type of lattice is found in potassium chloride crystal

[MP PMT 1996]

1. Face centred cubic

2. Body centred cubic

3. Simple cubic

4. Simple tetragonal

Q. a sold element x forms cubic crystal in which atoms occupy corners , two atoms on each body diagonal and also one atom at each edge centre .effective no.of x atoms in the unit cell is

Q.

Which would exhibit coordination isomerism?

1. [Co(NH₃)₅Br]²⁺SO₄ ^2-

2. [Pt(NH₃)₄Cl₂]Br₂

3. [Cr(NH₃)₆] [Co(CN)₆]

4. [Cr(NH₃)₆]Cl₃

Q. Ions are the constituent particles of ionic solid. Such solids are formed by the three-dimensional arrangement of cations and an ions bounded by strong coulombic forces. These solids are hard and brittle in nature. They have high melting and boiling point. Some information are given in List - I and List - II, match the List-I with List-II

List -I	List II
(I) Co-ordination number of $C{a}^{2+}\text{and}{F}^{-}$ in fluorite structure	(P) 8, 4
(II) Co-ordination number of $Z{n}^{2+}\text{and}{S}^{2-}$ in zinc blende structure	(Q) 8, 8
(III) Co-ordination number of $C{s}^{+}\text{and}C{l}^{-}$ in $CsCl$ (bcc type) structure	(R) 4, 8
(IV) Co-ordination number of $L{i}^{+}\text{and}{O}^{2-}$ in antifluorite structure	(S) 4, 4

Which of the following option has the correct combination considering List-I and List-II

1. I-S
2. II-Q
3. III-P
4. IV-R

Q. A crystal of lead (II) sulphide has NaCl structure. In this crystal the shortest distance between a $P{b}^{2+}$ ion and $S^{2-}$
ion is 300 pm. What is the volume of a unit cell of lead sulphide ?

1. $216\times {10}^{-24}c{m}^3$
2. $2.7\times {10}^{-23}c{m}^3$
   
3. $216\times {10}^{-30}c{m}^3$
   
4. $27\times {10}^{-30}c{m}^3$

Q. Which type of void is present in body centred cubic lattice

Q.

Which of the following statements is not true about NaCl structure

[DCE 2001]

1. Cl^- ions has coordination number 6

2. Each unit cell contains 4 NaClmolecules
3. Cl^- ions are in fcc arrangement

4. Na⁺ ions has coordination number 4

Q.

In fluorite structure (CaF₂)

1. None

2. Ca²⁺ ions are ccp and F^- ions are present in all the tetrahedral voids

3. Ca²⁺ ions are ccp and F^- ions are present in all the octahedral voids

4. Ca²⁺ ions are ccp and F^- ions are present in all the octahedral voids & half of thetetrahedral voids

Q. Which of the following fcc structure contains cations in alternate tetrahedral voids?

1. $NaCl$
2. $ZnS$
3. $N{a}_{2}O$
4. $Ca{F}_2$

Q.

The number of atoms per unit cell in a body centred cubic arrangement is:

1. 12

2. 2

3. 8

4. 6

Q. How many Coulomb's of electricity are required for the reduction of 1 mole of $Mn{O}_4^{-}toM{n}^{2+}$

1. $96500C$
2. $1.93\times {10}^{5}C$
3. $4.83\times {10}^{5}C$
4. $9.65\times {10}^{6}C$

Q.

The radius ratio of $C{s}^{+}$ to $C{l}^{-}$ is 0.90. If the radius of $C{l}^{-}$ ion is $1.80\stackrel{\circ }{A}$, the false statement regarding the CsCl structure is ?

1. The distance between the centres of $C{l}^{-}$ ions is greater than $3.60\stackrel{\circ }{A}$

2. The distance between $C{s}^{+}$ ion and $C{l}^{-}$ is $3.42\stackrel{\circ }{A}$

3. The distance between two $C{s}^{+}$ ions is greater than $3.24\stackrel{\circ }{A}$

4. The distance between $C{s}^{+}$ ion and $C{l}^{-}$ is $3.60\stackrel{\circ }{A}$

Q.

What is a lattice

Q. (a) Why does presence of excess of lithium make LiCl crystals pink?
(b) A solid with cubic crystal is made of two elements P and Q. Atoms of Q are at the corners of the cube and P at the body-centre. What is the formula of the compound?