A solution of concentration C g equiv/L has a specific resistance R. The equivalent conductance of the solution is

• R/C

• C/R

• 1000/RC

• 1000R/C

For the following cell reaction,

Ag | Ag⁺ | AgCl | Cl${}^{⊝}$ | Cl₂, Pt

$∆{\mathrm{G}}_{\mathrm{f}}^{°}$ (AgCl) = - 109 kJ/ mol

$∆{\mathrm{G}}_{\mathrm{f}}^{°}$ (Cl^{${}^{⊝}$}) = -129 kJ/ mol

$∆{\mathrm{G}}_{\mathrm{f}}^{°}$(Ag⁺) = 78 kJ/ mol

E° of the cell is

• -0.60 V

• 0.60 V

• 6.0 V

• None of these

Which one of the following is most effective in causing the coagulation of an As₂S₃ sol?

• KCl

• AlCl₃

• MgSO₄

• K₃Fe(CN)₆

At a certain temperature and at infinite dilution, the equivalent conductances of sodium benzoate, hydrochloric acid and sodium chlonde are 240, 349 and 229 ohm^-1 cm²equiv^-1 respectively. The equivalent conductance of benzoic acid in ohm^-1 cm²equiv^-1 at the same conditions is

• 80

• 328

• 360

• 408

Match the following-

• A - iii; B - i; C - ii; D - v

• A - ii; B - v; C - i; D - iv

• A - iii; B - iv; C - i; D - ii

• A - v; B - i; C - iv; D - ii

If the values of ${\wedge }_{\infty }$ of NH₄Cl, NaOH and NaCl are 130, 217 and 109 ohm^-1 cm² equiv^-1 respectively, the ${\wedge }_{\infty }$ of NH₄OH in ohm^-1 cm² equiv^-1 is

• 238

• 196

• 22

• 456

During the electrolysis of copper sulphate aqueous solution using copper electrode, the reaction taking place at the cathode is

• Cu → Cu²⁺ (aq) + 2e^-

• Cu²⁺ (aq) + 2e^- → Cu (s)

• H⁺ (aq) + e^- → $\frac{1}{2}$ H₂ (g)

• SO${}_4^{2-}$ (aq) → SO₃ (g) + $\frac{1}{2}$O₂ (g) + 2e^-

The extent of charge of lead accumulator is determined by

• amount of PbSO₄ in the battery

• amount of PbO₂ in the battery

• specific gravity of H₂SO₄ of the battery

• amount of Pb in the battery

The emf (in V) of a Daniell cell containing 0.1 M ZnSO₄ and 0.01 M CuSO₄ solutions at their respective electrodes is

$({\mathrm{E}}_{{\mathrm{Cu}}^{2+}/\mathrm{Cu}}^{°}= + 0.34 \mathrm{V}; {\mathrm{E}}_{{\mathrm{Zn}}^{2+}/ \mathrm{Zn}}^{°} = -0.76\mathrm{V})$

• 1.10

• 1.16

• 1.13

• 1.07

The role of copper diaphragm in Whytlaw-Gray's method is

• preventing the corrosion of electrolytic cell

• preventing the mixing of H₂ and F₂

• as anode

• as cathode