The Gibbs energy for the decomposition of Al₂O₃ at 500°C is as follows

The potential difference needed for electrolytic reduction of Al₂O₃ at 500°C is at least

• 4.5 V

• 3.0 V

• 2.5 V

• 2.5 V

Given,


Among the following, the strongest reducing agent is

• Cr

• Mn²⁺

• Cr³⁺

• Cr³⁺

13.

Given:  The value of standard electrode potential for the change  will be

• -0.072

• 0.385 V

• 0.770 V

• 0.770 V

On the basis of the following thermochemical data: (∆f G° H(aq)+=0)
H₂O(l) → H⁺(aq) + OH^–(aq); ∆H =57.32kJ
H₂(g) + 1/2O₂(g) → H₂O(l); ∆H = –286.20 kJ
The value of enthalpy of formation of OH^–ion at 25°C is

•  –22.88 kJ

• –228.88 kJ

• +228.88 kJ

• +228.88 kJ

• 0.26

• 0.399

• 0-399

• 0-399

The cell, Zn|Zn²⁺ (1M)|| Cu²⁺ (1M|Cu(Eocell = 1.10 V), was allowed to be completely discharged at 298 K. THe relative concentration of Zn²⁺ to Cu²⁺ 

• antilog (24.08)

• 37.3

• 10^37.3

• 10^37.3

In a saturated solution of the sparingly soluble strong electrolyte AgIO₃ (molecular mass = 283) the equilibrium which sets in is


If the solubility product constant Ksp of AgIO₃ at a given temperature is 1.0 × 10^-8, what is the mass of AgIO₃ contained in 100 ml of its saturated solution

• 28.3 × 10^–2 g

• 2.83 × 10^–3 g

• 1.0 × 10^–7 g

• 1.0 × 10^–7 g

The equivalent conductances of two strong electrolytes at infinite dilution in H₂O (where ions move freely through a solution) at 25°C are given below:

What additional information/quantity one needs to calculate Λ of an aqueous solution of acetic acid?

• ∧° of NaCl

• Λº of CH₃COOH

• The limiting equivalent conductance of 

• The limiting equivalent conductance of 

The first and second dissociation constants of an acid H₂A are 1.0 × 10^–5 & 5.0 × 10^–10 respectively. The overall dissociation constant of the acid will be

• 5.0 × 10^–5

• 5.0 × 10¹⁵

• 5.0 × 10^–15

• 5.0 × 10^–15

The molar conductivities ∧^oNaOAc and ∧^o HCl at infinite dilution in water at 25^o C are 91.0 and 426.2 S cm² /mol respectively. To calculate ∧^o HOAc, the additional value required is

• ∧^oH₂O

• ∧^oKCl

• ∧^oNaOH

• ∧^oNaOH