All Questions - Page 44

Chemistry

A metal surface of $100 \mathrm{~cm}^{2}$ area has to be coated with nickel layer of thickness $0.001 \mathrm{~mm}$ . A current of $2 \mathrm{~A}$ was passed through a solution of $\mathrm{Ni}\left(\mathrm{NO}_{3}\right)_{2}$ for ' $\mathrm{x}$ ' seconds to coat the desired layer. The value of $\mathrm{x}$ is __________. (Nearest integer) ( $\rho_{\mathrm{Ni}}$ (density of Nickel) is $10 \mathrm{~g} \mathrm{~mL}$ , Molar mass of Nickel is $60 \mathrm{~g} \mathrm{~mol}^{-1}$ $\left.\mathrm{F}=96500 ~\mathrm{C} ~\mathrm{mol}^{-1}\right)$

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Chemistry

One Faraday of electricity liberates $x \times 10^{-1}$ gram atom of copper from copper sulphate. $x$ is ________.

Chemistry

An oxidation-reduction reaction in which
3 electrons are transferred has a $\Delta$ Gº of 17.37 kJ mol^–1 at
25 ^oC. The value of E^o
cell (in V) is ______ × 10^–2.
(1 F = 96,500 C mol^–1)

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Chemistry

A constant current was passed through a solution of $\mathrm{AuCl}_4^{-}$ ion between gold electrodes. After a period of 10.0 minutes, the increase in mass of cathode was $1.314 \mathrm{~g}$ . The total charge passed through the solution is _______ .

Chemistry

The photoelectric current from Na (Work function, w₀ = 2.3 eV) is stopped by the output voltage of the cell
Pt(s) | H₂ (g, 1 Bar) | HCl (aq., pH =1) | AgCl(s) | Ag(s).
The pH of aq. HCl required to stop the photoelectric current form K(w₀ = 2.25 eV), all other conditions remaining the same, is _______ $\times$ 10^-2 (to the nearest integer).

Given, 2.303 ${{RT} \over F}$ = 0.06 V;

Chemistry

For the disproportionation reaction
2Cu⁺(aq) ⇌ Cu(s) + Cu²⁺(aq) at 298 K. ln K
(where K is the equilibrium constant) is
___________ × 10^–1.
Given :
( $E_{C{u^{2 + }}/C{u^ + }}^0 = 0.16V$

Chemistry

The Gibbs change (in J) for the given reaction at
[Cu²⁺] = [Sn²⁺] = 1 M and 298K is :

Cu(s) + Sn²⁺(aq.) $\to$ Cu²⁺(aq.) + Sn(s);

( $E_{S{n^{2 + }}|Sn}^0 = - 0.16\,V$ , Take F = 96500 C mol)

Chemistry

The magnitude of the change in oxidising power of the $MnO_4^ - /M{n^{2 + }}$ couple is x 10 V, if the H concentration is decreased from 1M to 10

Chemistry

Emf of the following cell at 298K in V is x $\times$ 10^{$-$ 2}.
Zn|Zn²⁺(0.1 M)||Ag⁺ (0.01 M)|Ag
The value of x is _________. (Rounded off to the nearest integer)
[Given : $E_{Z{n^{2 + }}/Zn}^\theta = - 0.76V;E_{A{g^{2 + }}/Ag}^\theta = + 0.80V;{{2.303RT} \over F} = 0.059$ ]

Chemistry

The molar conductivities at infinite dilution of barium chloride, sulphuric acid and hydrochloric acid are 280, 860 and 426 S cm² mol^{$-$ 1} respectively. The molar conductivity at infinite dilution of barium sulphate is _________ S cm² mol^{$-$ 1}. (Round off to the Nearest Integer ).

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Chemistry

For the cell
Cu(s) | Cu²⁺ (aq) (0.1 M) || Ag⁺(aq) (0.01 M) | Ag(s)
the cell potential E₁ = 0.3095 V
For the cell
Cu(s) | Cu²⁺ (aq) (0.01 M) || Ag⁺(aq) (0.001 M) | Ag(s)
the cell potential = ____________ $\times$ 10^{$-$ 2} V. (Round off the nearest integer).
[Use : ${{2.303RT} \over F}$ = 0.059]

Chemistry

These are physical properties of an element

(A) Sublimation enthalpy

(B) Ionisation enthalpy

(C) Hydration enthalpy

(D) Electron gain enthalpy

The total number of above properties that affect the reduction potential is ____________ (Integer answer)

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Chemistry

For the galvanic cell,

Zn(s) + Cu²⁺ (0.02 M) $\to$ Zn²⁺ (0.04 M) + Cu(s),

E_cell = ______________ $\times$ 10^{$-$ 2} V. (Nearest integer)

Chemistry

Consider the following cell reaction :

$C{d_{(s)}} + H{g_2}S{O_{4(s)}} + {9 \over 5}{H_2}{O_{(l)}}$ is ___________. (Nearest integer) [Given : Faraday constant = 96487 C mol]

Chemistry

Among $\mathrm{CrO}, \mathrm{Cr}_2 \mathrm{O}_3$ and , the sum of spin-only magnetic moment values of basic and amphoteric oxides is _________ (nearest integer).

Chemistry

The cell potential for the following cell

Pt |H₂(g)|H⁺ (aq)|| Cu²⁺ (0.01 M)|Cu(s)

is 0.576 V at 298 K. The pH of the solution is __________. (Nearest integer)

(Given : $E_{C{u^{2 + }}/Cu}^o = 0.34$ V and V)

Chemistry

The cell potential for $\mathrm{Zn}\left|\mathrm{Zn}^{2+}(\mathrm{aq})\right|\left|\mathrm{Sn}^{x+}\right| \mathrm{Sn}$ is at . The reaction quotient for the above reaction is . The number of electrons involved in the given electrochemical cell reaction is ____________.

Chemistry

The spin-only magnetic moment value of M³⁺ ion (in gaseous state) from the pairs Cr³⁺ / Cr²⁺, Mn³⁺ / Mn²⁺, Fe³⁺ / Fe²⁺ and Co³⁺ / Co²⁺ that has negative standard electrode potential, is ____________ B.M. [Nearest integer]

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Chemistry

For a cell, $\mathrm{Cu}(\mathrm{s})\left|\mathrm{Cu}^{2+}(0.001 \,\mathrm{M}) \| \mathrm{Ag}^{+}(0.01 \,\mathrm{M})\right| \mathrm{Ag}(\mathrm{s})$

Chemistry

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Question Bank

One Faraday of electricity liberates $x \times 10^{-1}$ gram atom of copper from copper sulphate. $x$ is ________.

An oxidation-reduction reaction in which
3 electrons are transferred has a $\Delta$ Gº of 17.37 kJ mol^–1 at
25 ^oC. The value of E^o
cell (in V) is ______ × 10^–2.
(1 F = 96,500 C mol^–1)

A constant current was passed through a solution of $\mathrm{AuCl}_4^{-}$ ion between gold electrodes. After a period of 10.0 minutes, the increase in mass of cathode was $1.314 \mathrm{~g}$ . The total charge passed through the solution is _______ .

For the disproportionation reaction
2Cu⁺(aq) ⇌ Cu(s) + Cu²⁺(aq) at 298 K. ln K
(where K is the equilibrium constant) is
___________ × 10^–1.
Given :
( $E_{C{u^{2 + }}/C{u^ + }}^0 = 0.16V$

The Gibbs change (in J) for the given reaction at
[Cu²⁺] = [Sn²⁺] = 1 M and 298K is :

Cu(s) + Sn²⁺(aq.) $\to$ Cu²⁺(aq.) + Sn(s);

( $E_{S{n^{2 + }}|Sn}^0 = - 0.16\,V$ , Take F = 96500 C mol)

The magnitude of the change in oxidising power of the $MnO_4^ - /M{n^{2 + }}$ couple is x 10 V, if the H concentration is decreased from 1M to 10

Emf of the following cell at 298K in V is x $\times$ 10^{$-$ 2}.
Zn|Zn²⁺(0.1 M)||Ag⁺ (0.01 M)|Ag
The value of x is _________. (Rounded off to the nearest integer)
[Given : $E_{Z{n^{2 + }}/Zn}^\theta = - 0.76V;E_{A{g^{2 + }}/Ag}^\theta = + 0.80V;{{2.303RT} \over F} = 0.059$ ]

The molar conductivities at infinite dilution of barium chloride, sulphuric acid and hydrochloric acid are 280, 860 and 426 S cm² mol^{$-$ 1} respectively. The molar conductivity at infinite dilution of barium sulphate is _________ S cm² mol^{$-$ 1}. (Round off to the Nearest Integer ).

These are physical properties of an element

(A) Sublimation enthalpy

(B) Ionisation enthalpy

(C) Hydration enthalpy

(D) Electron gain enthalpy

The total number of above properties that affect the reduction potential is ____________ (Integer answer)

For the galvanic cell,

Zn(s) + Cu²⁺ (0.02 M) $\to$ Zn²⁺ (0.04 M) + Cu(s),

E_cell = ______________ $\times$ 10^{$-$ 2} V. (Nearest integer)

Consider the following cell reaction :

$C{d_{(s)}} + H{g_2}S{O_{4(s)}} + {9 \over 5}{H_2}{O_{(l)}}$ is ___________. (Nearest integer) [Given : Faraday constant = 96487 C mol]

Among $\mathrm{CrO}, \mathrm{Cr}_2 \mathrm{O}_3$ and , the sum of spin-only magnetic moment values of basic and amphoteric oxides is _________ (nearest integer).

The cell potential for the following cell

Pt |H₂(g)|H⁺ (aq)|| Cu²⁺ (0.01 M)|Cu(s)

is 0.576 V at 298 K. The pH of the solution is __________. (Nearest integer)

(Given : $E_{C{u^{2 + }}/Cu}^o = 0.34$ V and V)

The cell potential for $\mathrm{Zn}\left|\mathrm{Zn}^{2+}(\mathrm{aq})\right|\left|\mathrm{Sn}^{x+}\right| \mathrm{Sn}$ is at . The reaction quotient for the above reaction is . The number of electrons involved in the given electrochemical cell reaction is ____________.

The spin-only magnetic moment value of M³⁺ ion (in gaseous state) from the pairs Cr³⁺ / Cr²⁺, Mn³⁺ / Mn²⁺, Fe³⁺ / Fe²⁺ and Co³⁺ / Co²⁺ that has negative standard electrode potential, is ____________ B.M. [Nearest integer]

For a cell, $\mathrm{Cu}(\mathrm{s})\left|\mathrm{Cu}^{2+}(0.001 \,\mathrm{M}) \| \mathrm{Ag}^{+}(0.01 \,\mathrm{M})\right| \mathrm{Ag}(\mathrm{s})$

At what pH, given half cell $\mathrm{MnO_{4}^{-}(0.1~M)~|~Mn^{2+}(0.001~M)}$ will have electrode potential of 1.282 V? ___________ (Nearest Integer)

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