Ionic Bond

Q.

Why is bond-making exothermic?

Q. In the following pair of compounds, ionic and covalent hydrides are, respectively:

1. $Si{H}_4,B_2{H}_6$
2. $LiH,NaH$
3. $B_2{H}_6,NaH$
4. $Ca{H}_2,Si{H}_4$

Q.

Give reason for the following:

Ionic compounds conduct electricity in molten state

Q. The ionic bonds $X^{+}{Y}^{-}$ are formed when:

1. Electron affinity of $Y$ is low and ionisation energy of $X$ is high
2. Electron affinity of $Y$ is high and ionisation energy of $X$ is low
3. Lattice energy of $XY$ is low
4. None of these

Q. Electronic configuration of some elements are given below:
$L:1s^{2}2s^{2}2p^4$
$Q:1s^{2}2s^{2}2p^{6}3s^{2}3p^5$
$P:1s^{2}2s^{2}2p^6,3s^1$
$R:1s^{2}2s^{2}2p^{6}3s^2$
The ionic compound that can be formed by these elements are:

1. $L_{2}P,RL,PQ$ and $R_{2}Q$
2. $LP,RL,PQ$ and $RQ$
3. $P_{2}L,RL,PQ$ and $R{Q}_2$
4. $LP,R_{2}L,P_{2}Q$ and $RQ$

Q. The experimental value of dipole moment of $HCl$ is $1.05D$. The length of the $H-Cl$ bond is $1.250A^{\circ }$. The percentage of ionic character in $HCl$ is: (Given, $\frac{2}{3.34}=0.6$)

Q.

The geometric form of crystals is the result of orderly arrangement of _____

1. Molecules only

2. ions only

3. Atoms only

4. Any of the above

Q.

The geometric form of crystals is the result of orderly arrangement of _____

1. Molecules only

2. ions only

3. Atoms only

4. Any of the above

Q.

Formation of chemical bond is accompanied by __________

1. Decrease in energy

2. Increase in energy

3. No change

4. None of these