Ionic and Covalent Character

Q. According to Fajans' rules, ionic bonds are formed when cations have :

1. low positive charge and large size
2. low positive charge and small size
3. high positive charge and large size, and anions have a small size
4. low positive charge and large size, and anions have a small size

Q. If the electronegativity of atom A is 2.0 and atom B is 3.0, then what is the percentage ionic character of bond A-B?

1. 80.5 %
   
2. 12.5 %
3. 19.5 %
4. 87.5 %

Q. The correct order of the increasing ionic character is :

1. $BeC{l}_2<MgC{l}_2<CaC{l}_2<BaC{l}_2$
2. $BeC{l}_2<MgC{l}_2<BaC{l}_2<CaC{l}_2$
3. $BeC{l}_2<BaC{l}_2<MgC{l}_2<CaC{l}_2$
4. $BaC{l}_2<MgC{l}_2<CaC{l}_2<BeC{l}_2$

Q.

Hanny - Smith formula for calculating the percentage of ionic character is

1. $16(|x_A-x_B|)+3.5(x_A-x_B{)}^2$
2. $16(x_A-x_B)+3.5(x_A-x_B{)}^2$
3. $16(x_A-x_B{)}^2-3.5(x_A-x_B)$
4. $16(x_A-x_B{)}^2+3.5(x_A-x_B{)}^2$

Q. The dipole moment of $NaCl$ molecule is $8.4\text{D}$ and its bond length is $2.1\stackrel{\circ }{\text{A}}$. The percentage ionic character in this molecule will be:

1. $50.25\%$
2. $60.30\%$
3. $83.33\%$
4. $100\%$

Q.

Hanny - Smith formula for calculating the percentage of ionic character is

1. $16(|x_A-x_B|)+3.5(x_A-x_B{)}^2$
2. $16(x_A-x_B)+3.5(x_A-x_B{)}^2$
3. $16(x_A-x_B{)}^2-3.5(x_A-x_B)$
4. $16(x_A-x_B{)}^2+3.5(x_A-x_B{)}^2$

Q. The dipole moment of $NaCl$ molecule is $8.4\text{D}$ and its bond length is $2.1\stackrel{\circ }{\text{A}}$. The percentage ionic character in this molecule will be:

1. $50.25\%$
2. $60.30\%$
3. $83.33\%$
4. $100\%$

Q. Select the most ionic and most covalent compounds respectively from the following. $Cr{O}_5,M{n}_2{O}_7,PbO,Sn{O}_2$

1. $Cr{O}_5,M{n}_2{O}_7$
2. $PbO,M{n}_2{O}_7$
3. $Sn{O}_2,Cr{O}_5$
4. All of the above.

Q. Polarization is an important phenomenon which is helpful in determination of covalent nature of compound. With the help of Fajan's rule one can easily predict the nature of compound.
Which of the following possess the least covalent character?

1. $LiCl$
2. $NaCl$
3. $KCl$
4. $CsCl$

Q. The dipole moment of $NaCl$ molecule is $8.4\text{D}$ and its bond length is $2.1\stackrel{\circ }{\text{A}}$. The percentage ionic character in this molecule will be:

1. $50.25\%$
2. $60.30\%$
3. $83.33\%$
4. $100\%$