\({\rm{NaCl,}}\,\,{\rm{KN}}{{\rm{O}}_{\rm{3}}}{\rm{,}}\,\,{\rm{HCl}}\) are strong electrolytes but size of hydrated \({{\rm{H}}^{\rm{ + }}}\) ion is small. Smaller the size of ion, greater is the conductivity.
CHXII03:ELECTROCHEMISTRY
330002
Statement A : The cell potential of mercury cell is 1.35 V, which remains constant. Statement B : In mercury cell, the electrolyte is a paste of KOH and ZnO.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both Statements are correct.
4 Both Statements are incorrect.
Explanation:
\({\rm{Zn(1) + HgO(s)}} \to {\rm{Zn(s) + Hg(1)}}\) The cell potential remains constant during its life as the overall reaction does not involve any ion in solution whose concentration changes during its life time. So, the option (3) is correct.
CHXII03:ELECTROCHEMISTRY
330003
What is the SI unit of conductivity?
1 \({\rm{Sm}}\)
2 \({\rm{S}}{{\rm{m}}^{{\rm{ - 1}}}}\)
3 \({\rm{S}}{{\rm{m}}^{\rm{2}}}\)
4 \({\rm{S}}{{\rm{m}}^{{\rm{ - 2}}}}\)
Explanation:
The reciprocal of specific resistance or resistivity \(\left( {\rm{\rho }} \right)\) is called specific conductance or conductivity \(\left( {\rm{\kappa }} \right)\). The SI unit of conductivity is \({\rm{S}}{{\rm{m}}^{{\rm{ - 1}}}}\).
CHXII03:ELECTROCHEMISTRY
330004
Assertion : Substances like glass, ceramics, etc. having very low conductivity are known as insulators. Reason : They do not allow the passage of electric current through them.
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:
The substances which do not allow the flow of electric current through them are termed as insulators. So, option (1) is correct.
CHXII03:ELECTROCHEMISTRY
330005
Conductivity of a strong electrolyte
1 may increase or decrease with dilution
2 Decreases on dilution
3 Increases on dilution
4 Does not change with dilution
Explanation:
Strong electrolyte ionizes completely on dilution and the number of ions does not increase on dilution. A small increase in \({{\rm{\Lambda }}_{\rm{m}}}\) with dilution is due to the weakening of electrostatic attraction between the ions on dilution.
\({\rm{NaCl,}}\,\,{\rm{KN}}{{\rm{O}}_{\rm{3}}}{\rm{,}}\,\,{\rm{HCl}}\) are strong electrolytes but size of hydrated \({{\rm{H}}^{\rm{ + }}}\) ion is small. Smaller the size of ion, greater is the conductivity.
CHXII03:ELECTROCHEMISTRY
330002
Statement A : The cell potential of mercury cell is 1.35 V, which remains constant. Statement B : In mercury cell, the electrolyte is a paste of KOH and ZnO.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both Statements are correct.
4 Both Statements are incorrect.
Explanation:
\({\rm{Zn(1) + HgO(s)}} \to {\rm{Zn(s) + Hg(1)}}\) The cell potential remains constant during its life as the overall reaction does not involve any ion in solution whose concentration changes during its life time. So, the option (3) is correct.
CHXII03:ELECTROCHEMISTRY
330003
What is the SI unit of conductivity?
1 \({\rm{Sm}}\)
2 \({\rm{S}}{{\rm{m}}^{{\rm{ - 1}}}}\)
3 \({\rm{S}}{{\rm{m}}^{\rm{2}}}\)
4 \({\rm{S}}{{\rm{m}}^{{\rm{ - 2}}}}\)
Explanation:
The reciprocal of specific resistance or resistivity \(\left( {\rm{\rho }} \right)\) is called specific conductance or conductivity \(\left( {\rm{\kappa }} \right)\). The SI unit of conductivity is \({\rm{S}}{{\rm{m}}^{{\rm{ - 1}}}}\).
CHXII03:ELECTROCHEMISTRY
330004
Assertion : Substances like glass, ceramics, etc. having very low conductivity are known as insulators. Reason : They do not allow the passage of electric current through them.
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:
The substances which do not allow the flow of electric current through them are termed as insulators. So, option (1) is correct.
CHXII03:ELECTROCHEMISTRY
330005
Conductivity of a strong electrolyte
1 may increase or decrease with dilution
2 Decreases on dilution
3 Increases on dilution
4 Does not change with dilution
Explanation:
Strong electrolyte ionizes completely on dilution and the number of ions does not increase on dilution. A small increase in \({{\rm{\Lambda }}_{\rm{m}}}\) with dilution is due to the weakening of electrostatic attraction between the ions on dilution.
\({\rm{NaCl,}}\,\,{\rm{KN}}{{\rm{O}}_{\rm{3}}}{\rm{,}}\,\,{\rm{HCl}}\) are strong electrolytes but size of hydrated \({{\rm{H}}^{\rm{ + }}}\) ion is small. Smaller the size of ion, greater is the conductivity.
CHXII03:ELECTROCHEMISTRY
330002
Statement A : The cell potential of mercury cell is 1.35 V, which remains constant. Statement B : In mercury cell, the electrolyte is a paste of KOH and ZnO.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both Statements are correct.
4 Both Statements are incorrect.
Explanation:
\({\rm{Zn(1) + HgO(s)}} \to {\rm{Zn(s) + Hg(1)}}\) The cell potential remains constant during its life as the overall reaction does not involve any ion in solution whose concentration changes during its life time. So, the option (3) is correct.
CHXII03:ELECTROCHEMISTRY
330003
What is the SI unit of conductivity?
1 \({\rm{Sm}}\)
2 \({\rm{S}}{{\rm{m}}^{{\rm{ - 1}}}}\)
3 \({\rm{S}}{{\rm{m}}^{\rm{2}}}\)
4 \({\rm{S}}{{\rm{m}}^{{\rm{ - 2}}}}\)
Explanation:
The reciprocal of specific resistance or resistivity \(\left( {\rm{\rho }} \right)\) is called specific conductance or conductivity \(\left( {\rm{\kappa }} \right)\). The SI unit of conductivity is \({\rm{S}}{{\rm{m}}^{{\rm{ - 1}}}}\).
CHXII03:ELECTROCHEMISTRY
330004
Assertion : Substances like glass, ceramics, etc. having very low conductivity are known as insulators. Reason : They do not allow the passage of electric current through them.
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:
The substances which do not allow the flow of electric current through them are termed as insulators. So, option (1) is correct.
CHXII03:ELECTROCHEMISTRY
330005
Conductivity of a strong electrolyte
1 may increase or decrease with dilution
2 Decreases on dilution
3 Increases on dilution
4 Does not change with dilution
Explanation:
Strong electrolyte ionizes completely on dilution and the number of ions does not increase on dilution. A small increase in \({{\rm{\Lambda }}_{\rm{m}}}\) with dilution is due to the weakening of electrostatic attraction between the ions on dilution.
\({\rm{NaCl,}}\,\,{\rm{KN}}{{\rm{O}}_{\rm{3}}}{\rm{,}}\,\,{\rm{HCl}}\) are strong electrolytes but size of hydrated \({{\rm{H}}^{\rm{ + }}}\) ion is small. Smaller the size of ion, greater is the conductivity.
CHXII03:ELECTROCHEMISTRY
330002
Statement A : The cell potential of mercury cell is 1.35 V, which remains constant. Statement B : In mercury cell, the electrolyte is a paste of KOH and ZnO.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both Statements are correct.
4 Both Statements are incorrect.
Explanation:
\({\rm{Zn(1) + HgO(s)}} \to {\rm{Zn(s) + Hg(1)}}\) The cell potential remains constant during its life as the overall reaction does not involve any ion in solution whose concentration changes during its life time. So, the option (3) is correct.
CHXII03:ELECTROCHEMISTRY
330003
What is the SI unit of conductivity?
1 \({\rm{Sm}}\)
2 \({\rm{S}}{{\rm{m}}^{{\rm{ - 1}}}}\)
3 \({\rm{S}}{{\rm{m}}^{\rm{2}}}\)
4 \({\rm{S}}{{\rm{m}}^{{\rm{ - 2}}}}\)
Explanation:
The reciprocal of specific resistance or resistivity \(\left( {\rm{\rho }} \right)\) is called specific conductance or conductivity \(\left( {\rm{\kappa }} \right)\). The SI unit of conductivity is \({\rm{S}}{{\rm{m}}^{{\rm{ - 1}}}}\).
CHXII03:ELECTROCHEMISTRY
330004
Assertion : Substances like glass, ceramics, etc. having very low conductivity are known as insulators. Reason : They do not allow the passage of electric current through them.
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:
The substances which do not allow the flow of electric current through them are termed as insulators. So, option (1) is correct.
CHXII03:ELECTROCHEMISTRY
330005
Conductivity of a strong electrolyte
1 may increase or decrease with dilution
2 Decreases on dilution
3 Increases on dilution
4 Does not change with dilution
Explanation:
Strong electrolyte ionizes completely on dilution and the number of ions does not increase on dilution. A small increase in \({{\rm{\Lambda }}_{\rm{m}}}\) with dilution is due to the weakening of electrostatic attraction between the ions on dilution.
\({\rm{NaCl,}}\,\,{\rm{KN}}{{\rm{O}}_{\rm{3}}}{\rm{,}}\,\,{\rm{HCl}}\) are strong electrolytes but size of hydrated \({{\rm{H}}^{\rm{ + }}}\) ion is small. Smaller the size of ion, greater is the conductivity.
CHXII03:ELECTROCHEMISTRY
330002
Statement A : The cell potential of mercury cell is 1.35 V, which remains constant. Statement B : In mercury cell, the electrolyte is a paste of KOH and ZnO.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both Statements are correct.
4 Both Statements are incorrect.
Explanation:
\({\rm{Zn(1) + HgO(s)}} \to {\rm{Zn(s) + Hg(1)}}\) The cell potential remains constant during its life as the overall reaction does not involve any ion in solution whose concentration changes during its life time. So, the option (3) is correct.
CHXII03:ELECTROCHEMISTRY
330003
What is the SI unit of conductivity?
1 \({\rm{Sm}}\)
2 \({\rm{S}}{{\rm{m}}^{{\rm{ - 1}}}}\)
3 \({\rm{S}}{{\rm{m}}^{\rm{2}}}\)
4 \({\rm{S}}{{\rm{m}}^{{\rm{ - 2}}}}\)
Explanation:
The reciprocal of specific resistance or resistivity \(\left( {\rm{\rho }} \right)\) is called specific conductance or conductivity \(\left( {\rm{\kappa }} \right)\). The SI unit of conductivity is \({\rm{S}}{{\rm{m}}^{{\rm{ - 1}}}}\).
CHXII03:ELECTROCHEMISTRY
330004
Assertion : Substances like glass, ceramics, etc. having very low conductivity are known as insulators. Reason : They do not allow the passage of electric current through them.
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:
The substances which do not allow the flow of electric current through them are termed as insulators. So, option (1) is correct.
CHXII03:ELECTROCHEMISTRY
330005
Conductivity of a strong electrolyte
1 may increase or decrease with dilution
2 Decreases on dilution
3 Increases on dilution
4 Does not change with dilution
Explanation:
Strong electrolyte ionizes completely on dilution and the number of ions does not increase on dilution. A small increase in \({{\rm{\Lambda }}_{\rm{m}}}\) with dilution is due to the weakening of electrostatic attraction between the ions on dilution.