A complex PtCl₄.5NH₃, shows a molar conductance of 402 ohm^-1 cm²mol^-1 in water and precipitates three moles ofAgCl with AgNO₃ solution. The formula of the complex is

• [Pt(NH₃)₆]Cl₄

• [Pt(NH₃)₄Cl₂]Cl₂

• [Pt(NH₃)₅Cl]Cl₃

• [Pt(NH₃)₃Cl₃]Cl

Calculate ${\wedge }_{\mathrm{HOAC}}^{\infty }$ using appropriate molar conductances of the electrolytes listed above at infinite dilution in H₂O at 25°C.

• 517.2

• 552.7

• 390.7

• 217.5

The standard half-cell reduction potential for Ag⁺| Ag is 0.7991 V at 25°C. Given the experimental value K_sp= 1.56 x 10^-10 for AgCl, calculate the standard half-cell reduction potential for the Ag | AgCl electrode.

• 0.2192V

• -0.2192V

• -1.2192 V

• 1.2192 V

Assertion : Reduction potential of Mn (+3 to +2) is more positive than Fe (+3 to +2).

Reason: Ionisation potential of Mn is more than that of Fe.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false.

For the electrochemical cell, M | M⁺ || X^- | X, ${\mathrm{E}}^{°}$(M⁺| M) = 0.44 V and ${\mathrm{E}}^{°}$(X | X^-) = 0.33 V. From this data one can deduce that

• M + X^- $\to$M^- + X^- is the spontateous reaction.

• M⁺ + X^- $\to$M + X is the spontaneous reaction.

• E_cell = 0.77 V

• E_cell = -0.77V

Assertion : Magnesium is extracted by the electrolysis of fused mixture of MgCl₂, NaCl and CaCl₂.

Reason : Calcium chloride acts as a reducing agent.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion : Zinc displaces copper from copper sulphate solution.

Reason : The ${\mathrm{E}}^{°}$of zinc is= 0.76 V and that of copper is + 0.34 V.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Which of the following does not conduct electricity ?

• Fused NaCl

• Solid NaCl

• Brine solution

• Copper

689.

When a quantity of electricity is passed through CusO₄ solution , 0.16 g of copper gets deposited .If the same quantity of electricity is passed through acidulated water , then the volume of H₂ liberated at STP will be :

[Given : atomic weight of Cu = 64]

• 10 cm³

• 56 cm³

• 604 cm³

• 8.0 cm³

Which one of the following condition will increase the voltage of the cell represented by the equation ?

Cu (s) + 2Ag⁺ (aq) $\rightleftharpoons$ Cu²⁺ (aq) + 2Ag (s)

• Increase in the dimension of Cu electrode

• Increase in the dimension of Ag electrode

• Increase in the concentration of Cu²⁺ ion

• Increase in the concentration of Ag⁺ ions