313664
The percentage ionic character in \(\mathrm{Cs}-\mathrm{Cl}\) bond in \(\mathrm{CsCl}\) molecule is _____. The electronegativity values of \(\mathrm{Cs}\) and \(\mathrm{Cl}\) are 0.7 and 3.0 respectively.
1 55.3
2 60
3 45
4 75.7
Explanation:
\(\mathrm{X}_{\mathrm{A}}-\mathrm{X}_{\mathrm{B}}=\mathrm{X}_{\mathrm{Cl}}-\mathrm{X}_{\mathrm{Cs}}=(3.0-0.7)=2.3\) Percentage ionic character in \(\mathrm{Cs}-\mathrm{Cl}\) bond \(\begin{aligned}& =\left[16 \times 2.3+3.5 \times(2.3)^{2}\right] \\& =[36.8+18.51]=55.31\end{aligned}\)
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE
313665
Assertion : As lattice encrgy increases, melting and boiling points of ionic compound increases. Reason : As lattice energy increases, slability of ionic compound increases.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
Lattice energy, the energy needed to break ionic bonds in a crystal lattice, influences boiling points; higher lattice energy in ionic compounds requires more energy to transition to a gaseous state, correlating with elevated boiling points.So the option (1) is correct.
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE
313666
Assertion : Decrease in lattice enthalpy is not as sharp as increase in interionic distance. Reason : Change in interionic distance affects the structure, which compensates the otherwise change in lattice enhalpy.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
Lattice enthalpy representing the energy to separate ions in an ionic compound. It is inversely proportional to the square of the interionic distance. As the distance increases, the electrostatic attraction weakens, causing a rapid decrease in lattice enthalpy. So the option (1) is correct.
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE
313667
The higher lattice energy corresponds to
1 \(\mathrm{MgO}\)
2 \(\mathrm{CaO}\)
3 \(\mathrm{SrO}\)
4 \(\mathrm{BaO}\)
Explanation:
Lattice energy \(\propto\) charge of ion \(\propto \dfrac{1}{\text { size of ion }}\) On moving downward, the size of alkaline earth metals increases due to increase in number of shells. Thus, Mg has the smallest size. Hence, lattice energy is higher for \(\mathrm{MgO}\).
313664
The percentage ionic character in \(\mathrm{Cs}-\mathrm{Cl}\) bond in \(\mathrm{CsCl}\) molecule is _____. The electronegativity values of \(\mathrm{Cs}\) and \(\mathrm{Cl}\) are 0.7 and 3.0 respectively.
1 55.3
2 60
3 45
4 75.7
Explanation:
\(\mathrm{X}_{\mathrm{A}}-\mathrm{X}_{\mathrm{B}}=\mathrm{X}_{\mathrm{Cl}}-\mathrm{X}_{\mathrm{Cs}}=(3.0-0.7)=2.3\) Percentage ionic character in \(\mathrm{Cs}-\mathrm{Cl}\) bond \(\begin{aligned}& =\left[16 \times 2.3+3.5 \times(2.3)^{2}\right] \\& =[36.8+18.51]=55.31\end{aligned}\)
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE
313665
Assertion : As lattice encrgy increases, melting and boiling points of ionic compound increases. Reason : As lattice energy increases, slability of ionic compound increases.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
Lattice energy, the energy needed to break ionic bonds in a crystal lattice, influences boiling points; higher lattice energy in ionic compounds requires more energy to transition to a gaseous state, correlating with elevated boiling points.So the option (1) is correct.
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE
313666
Assertion : Decrease in lattice enthalpy is not as sharp as increase in interionic distance. Reason : Change in interionic distance affects the structure, which compensates the otherwise change in lattice enhalpy.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
Lattice enthalpy representing the energy to separate ions in an ionic compound. It is inversely proportional to the square of the interionic distance. As the distance increases, the electrostatic attraction weakens, causing a rapid decrease in lattice enthalpy. So the option (1) is correct.
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE
313667
The higher lattice energy corresponds to
1 \(\mathrm{MgO}\)
2 \(\mathrm{CaO}\)
3 \(\mathrm{SrO}\)
4 \(\mathrm{BaO}\)
Explanation:
Lattice energy \(\propto\) charge of ion \(\propto \dfrac{1}{\text { size of ion }}\) On moving downward, the size of alkaline earth metals increases due to increase in number of shells. Thus, Mg has the smallest size. Hence, lattice energy is higher for \(\mathrm{MgO}\).
313664
The percentage ionic character in \(\mathrm{Cs}-\mathrm{Cl}\) bond in \(\mathrm{CsCl}\) molecule is _____. The electronegativity values of \(\mathrm{Cs}\) and \(\mathrm{Cl}\) are 0.7 and 3.0 respectively.
1 55.3
2 60
3 45
4 75.7
Explanation:
\(\mathrm{X}_{\mathrm{A}}-\mathrm{X}_{\mathrm{B}}=\mathrm{X}_{\mathrm{Cl}}-\mathrm{X}_{\mathrm{Cs}}=(3.0-0.7)=2.3\) Percentage ionic character in \(\mathrm{Cs}-\mathrm{Cl}\) bond \(\begin{aligned}& =\left[16 \times 2.3+3.5 \times(2.3)^{2}\right] \\& =[36.8+18.51]=55.31\end{aligned}\)
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE
313665
Assertion : As lattice encrgy increases, melting and boiling points of ionic compound increases. Reason : As lattice energy increases, slability of ionic compound increases.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
Lattice energy, the energy needed to break ionic bonds in a crystal lattice, influences boiling points; higher lattice energy in ionic compounds requires more energy to transition to a gaseous state, correlating with elevated boiling points.So the option (1) is correct.
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE
313666
Assertion : Decrease in lattice enthalpy is not as sharp as increase in interionic distance. Reason : Change in interionic distance affects the structure, which compensates the otherwise change in lattice enhalpy.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
Lattice enthalpy representing the energy to separate ions in an ionic compound. It is inversely proportional to the square of the interionic distance. As the distance increases, the electrostatic attraction weakens, causing a rapid decrease in lattice enthalpy. So the option (1) is correct.
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE
313667
The higher lattice energy corresponds to
1 \(\mathrm{MgO}\)
2 \(\mathrm{CaO}\)
3 \(\mathrm{SrO}\)
4 \(\mathrm{BaO}\)
Explanation:
Lattice energy \(\propto\) charge of ion \(\propto \dfrac{1}{\text { size of ion }}\) On moving downward, the size of alkaline earth metals increases due to increase in number of shells. Thus, Mg has the smallest size. Hence, lattice energy is higher for \(\mathrm{MgO}\).
313664
The percentage ionic character in \(\mathrm{Cs}-\mathrm{Cl}\) bond in \(\mathrm{CsCl}\) molecule is _____. The electronegativity values of \(\mathrm{Cs}\) and \(\mathrm{Cl}\) are 0.7 and 3.0 respectively.
1 55.3
2 60
3 45
4 75.7
Explanation:
\(\mathrm{X}_{\mathrm{A}}-\mathrm{X}_{\mathrm{B}}=\mathrm{X}_{\mathrm{Cl}}-\mathrm{X}_{\mathrm{Cs}}=(3.0-0.7)=2.3\) Percentage ionic character in \(\mathrm{Cs}-\mathrm{Cl}\) bond \(\begin{aligned}& =\left[16 \times 2.3+3.5 \times(2.3)^{2}\right] \\& =[36.8+18.51]=55.31\end{aligned}\)
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE
313665
Assertion : As lattice encrgy increases, melting and boiling points of ionic compound increases. Reason : As lattice energy increases, slability of ionic compound increases.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
Lattice energy, the energy needed to break ionic bonds in a crystal lattice, influences boiling points; higher lattice energy in ionic compounds requires more energy to transition to a gaseous state, correlating with elevated boiling points.So the option (1) is correct.
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE
313666
Assertion : Decrease in lattice enthalpy is not as sharp as increase in interionic distance. Reason : Change in interionic distance affects the structure, which compensates the otherwise change in lattice enhalpy.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
Lattice enthalpy representing the energy to separate ions in an ionic compound. It is inversely proportional to the square of the interionic distance. As the distance increases, the electrostatic attraction weakens, causing a rapid decrease in lattice enthalpy. So the option (1) is correct.
CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE
313667
The higher lattice energy corresponds to
1 \(\mathrm{MgO}\)
2 \(\mathrm{CaO}\)
3 \(\mathrm{SrO}\)
4 \(\mathrm{BaO}\)
Explanation:
Lattice energy \(\propto\) charge of ion \(\propto \dfrac{1}{\text { size of ion }}\) On moving downward, the size of alkaline earth metals increases due to increase in number of shells. Thus, Mg has the smallest size. Hence, lattice energy is higher for \(\mathrm{MgO}\).
