51.

Which of the following is reducing agent?

• LiAlH₄

• Zn + HCl

• Sn + HCl

• All of the above

The process of oxidation involve

• loss of electron

• gain of electron

• loss of proton

• loss of neutron

The number of electrons transferred when KMnO₄ acts as an oxidising agent to give MnO₂ and Mn²⁺ respectively are

• 2, 3

• 1, 5

• 3, 5

• 1, 3

Which of the following is the strongest reducing agent?

• HF

• HCl

• HI

• HBr

The reaction,

3ClO^- (aq) → ClO${}_3^{-}$ (aq) + 2Cl^- (aq) is an example of

• oxidation reaction

• reduction reaction

• disproportionation reaction

• decomposition reaction

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