51.

See the following redox reaction

A²⁺ + 2e^- → A; E° = +0.34 V

   A⁺ + e^- → A; E° = +0.52 V

Which ion is expected to be stable?

• A²⁺

• A⁺

• Both can form stable complexes

• None can form stable complexes

A metal reacts with dil acid and liberates hydrogen. If the reduction potential of hydrogen be considered zero, the reduction potential of that metal will be

• equal to its oxidation potential

• positive

• Zero

• negative

Acidic dichromate ion reacts with hydrogen peroxide to give deep blue colour. This is due to the formation of

• CrO(O)₂

• CrO₅

• Bith (a) and (b)

• None of (a) and (b)

The coordination number and oxidation number X in the following compound [X(SO₄)(NH₃)₅]Cl will be

• 10 and 3

• 2 and 6

• 6 and 3

• 6 and 4

A galvanic cell is constructed using the redox reaction,

$\frac{1}{2}{\mathrm{H}}_2 \left(\mathrm{g}\right) + \mathrm{AgCl} \left(\mathrm{s}\right) \rightleftharpoons {\mathrm{H}}^{+} \left(\mathrm{aq}\right) + {\mathrm{Cl}}^{-} \left(\mathrm{aq}\right) + \mathrm{Ag}$

it is represented as

• Pt | H₂ (g) | HCl (sol)|| AgNO₃ (sol) | Ag

• Ag | AgCl (s) | KCl (sol) || HCl (sol), H₂ (g) | Pt

• Pt | H₂ (g) | KCl (sol) || AgCl (s) | Ag

• Pt | H₂ (g), HCl (sol) || AgCl (s) | Ag

The oxidation state of iron in K₄[Fe(CN)₆] is

• 1

• 4

• 3

• 2

When sulphur dioxide is passed in an acidified K₂Cr₂O₇ solution, the oxidation state of sulphur is changed from

• +4 to 0

• +4 to +2

• + 4 to +6

• +6 to +4

For the decomposition of a compound AB at 600 K, the following data were obtained

The order for the decomposition of AB is

• 1.5

• 0

• 1

• 2

The oxidation state of fe in the brown ring complex : [Fe(H₂O)₅NO]SO₄ is

• +3

• 0

• +2

• +1

A miscible mixture of C₆H₆ + CHCl₃ can be separated by

• sublimation

• distillation

• filtration

• crystallisation