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2021 8 questions

Q882021 · 1 Sept 2021 · Shift 2· Numerical answer
If the conductivity of mercury at $0^{\circ} C$ is $1.07 \times 1 0^{6} S m^{- 1}$ and the resistance of a cell containing mercury is $0.243Ω$ , then the cell constant of the cell is $x \times 1 0^{4} m^{- 1}$ . The value of x is ____. (Nearest integer)
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Answer: 26
Q852021 · 26 Aug 2021 · Shift 2· Numerical answer
For the galvanic cell, $Zn (s) + C u^{2 +} (0.02 M) \to Z n^{2 +} (0.04 M) + Cu (s)$ , $E_{cell} =$ ___________ $\times 1 0^{- 2} V$ . (Nearest integer) [ $Use : E_{Cu/C u^{2 +}}^{0} = - 0.34 V$ , $E_{Zn/Z n^{2 +}}^{0} = + 0.76 V$ , $\frac{2.303 R T}{F} = 0.059 V$ ]
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Answer: 109
Q902021 · 27 Jul 2021 · Shift 2· Numerical answer
For the cell $Cu (s) ∣ C u^{2 +} (aq) (0.1 M) ∥ A g^{+} (aq) (0.01 M) ∣ Ag (s)$ the cell potential $E_{1} = 0.3095 V$ For the cell $Cu (s) ∣ C u^{2 +} (aq) (0.01 M) ∥ A g^{+} (aq) (0.001 M) ∣ Ag (s)$ the cell potential = __________ $\times 1 0^{- 2} V$ . (Round off to the nearest integer). $[U se : \frac{2.303 R T}{F} = 0.059]$
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Answer: 28
Q862021 · 25 Jul 2021 · Shift 1· Numerical answer
Consider the cell at $2 5^{\circ} C$ $Zn ∣ Z n^{2 +} (aq), (1M) ∥ F e^{3 +} (aq), F e^{2 +} (aq) ∣ Pt (s)$ The fraction of total iron present as $F e^{3 +}$ ion at the cell potential of 1.500 V is $x \times 1 0^{- 2}$ . The value of x is ____. (Nearest integer) (Given : $E_{F e^{3 +} / F e^{2 +}}^{0} = 0.77 V$ , $E_{Z n^{2 +} / Z n}^{0} = - 0.76 V$ )
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Answer: 24
Q852021 · 18 Mar 2021 · Shift 2· Numerical answer
The molar conductivities at infinite dilution of barium chloride, sulphuric acid and hydrochloric acid are 280, 860 and $426 S c m^{2} mo l^{- 1}$ respectively. The molar conductivity at infinite dilution of barium sulphate is ____ $S c m^{2} mo l^{- 1}$ . (Round off to the Nearest Integer ).
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Answer: 288
Q652021 · 16 Mar 2021 · Shift 1
Given below are two statements : Statement I : The $E^{\circ}$ value for $C e^{4 +} /C e^{3 +}$ is $+ 1.74 V$ . Statement II : $Ce$ is more stable in $C e^{4 +}$ state than $C e^{3 +}$ state. In the light of the above statements, choose the most appropriate answer from the options given below :
1. A.Statement I is incorrect but statement II is correct
2. B.Both statement I and statement II are correct
3. C.Both statement I and statement II are incorrect
4. D.Statement I is correct but statement II is incorrect
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Answer: D
Q762021 · 26 Feb 2021 · Shift 1
Statements about heavy water are given below : A. Heavy water is used in exchange reactions for the study of reaction mechanisms. B. Heavy water is prepared by exhaustive electrolysis of water. (C) Heavy water has higher boiling point than ordinary water. (D) Viscosity of $H_{2} O$ is greater than $D_{2} O$ . Choose the most appropriate answer from the options given below :
1. A.A, B, and C only
2. B.A and C only
3. C.A and D only
4. D.A and B only
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Answer: A
Q852021 · 26 Feb 2021 · Shift 1· Numerical answer
Consider the following reaction $M n O_{4}^{-} + 8 H^{+} + 5 e^{-} \to M n^{+ 2} + 4 H_{2} O, E^{o} = 1.51 V$ . The quantity of electricity required in Faraday to reduce five moles of $M n O_{4}^{-}$ is _________. (Integer answer)
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Answer: 25