Write the SI unit of molar conductivity.
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Solution and Explanation
The standard international (SI) unit for molar conductivity, \( \Lambda_m \), is expressed as: \[ S \, m^2 \, \text{mol}^{-1} \] In this expression:
- \( S \) (Siemens) denotes the unit of electrical conductivity,
- \( m^2 \) indicates the area over which the conductivity is measured,
- \( \text{mol}^{-1} \) signifies per mole of the solution's electrolyte.
Top Questions on Electrochemistry
Standard electrode potential for \( \text{Sn}^{4+}/\text{Sn}^{2+} \) couple is +0.15 V and that for the \( \text{Cr}^{3+}/\text{Cr} \) couple is -0.74 V. The two couples in their standard states are connected to make a cell. The cell potential will be:
To calculate the cell potential (\( E^\circ_{\text{cell}} \)), we use the standard electrode potentials of the given redox couples.
Given data:
\( E^\circ_{\text{Sn}^{4+}/\text{Sn}^{2+}} = +0.15V \)
\( E^\circ_{\text{Cr}^{3+}/\text{Cr}} = -0.74V \)- CBSE CLASS XII - 2025
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- (a) Write the cell reaction and calculate the e.m.f. of the following cell at 298 K: \[ \text{Sn}(s) \mid \text{Sn}^{2+} (\text{0.004 M}) \parallel \text{H}^+ (\text{0.02 M}) \mid \text{H}_2 (\text{1 Bar}) \mid \text{Pt}(s) \] (Given: \( E^\circ_{\text{Sn}^{2+}/\text{Sn}} = -0.14 \, \text{V}, E^\circ_{\text{H}^+/\text{H}_2} = 0.00 \, \text{V} \)) \vspace{5pt}
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(a.)Write the anode and cathode reactions and the overall cell reaction occurring in a lead storage battery during its use.
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- The charge required for the reduction of 1 mol of \( MnO_4^- \) to \( MnO_2 \) is
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- Calculate \( \Lambda_m^0 \) for acetic acid and its degree of dissociation (\( \alpha \)) if its molar conductivity is 48.1 \( \Omega^{-1} \, \text{cm}^2 \, \text{mol}^{-1} \).
Given that
\( \Lambda_m^0 (\text{HC}) = 426 \, \Omega^{-1} \, \text{cm}^2 \, \text{mol}^{-1} \),
\( \Lambda_m^0 (\text{NaCl}) = 126 \, \Omega^{-1} \, \text{cm}^2 \, \text{mol}^{-1} \),
\( \Lambda_m^0 (\text{CH}_3\text{COONa}) = 91 \, \Omega^{-1} \, \text{cm}^2 \, \text{mol}^{-1} \).- CBSE CLASS XII - 2025
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- Ethanentrile into Ethanal
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- \([Ni(CN)_4]^{2-}\)
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- \([NiCl_4]^{2-}\)
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Mention the number of unpaired electrons and geometry of the following complexes:
(i) \([NiCl_4]^{2-}\)
(ii) \([Ni(CN)_4]^{2-}\)
Convert the following:
(a) Ethanenitrile into ethanal.
(b) Cyclohexane into adipic acid.
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