Redox Reactions NEET Question, Redox Reactions MCQ Question

1.

According to the classical concept, oxidation is defined as:

A.

Increase in the oxidation number of an element

B.

Gain of electrons by a substance

C.

Loss of electrons by a substance

D.

Addition of oxygen / electronegative element OR removal of hydrogen / electropositive element

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2.

In the reaction 2Mg + O₂ → 2MgO, magnesium is oxidised because:

A.

It loses an electron

B.

Hydrogen is removed from it

C.

Its oxidation number decreases

D.

Oxygen is added to it

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3.

In the reaction 2H₂S + O₂ → 2S + 2H₂O, H₂S is oxidised because:

A.

Sulphur gains electrons

B.

Hydrogen is removed from H₂S

C.

Oxygen is removed from H₂S

D.

Sulphur loses electrons

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4.

Reduction in classical sense involves:

A.

Removal of oxygen / electronegative element OR addition of hydrogen / electropositive element

B.

Loss of electrons only

C.

Increase in oxidation number

D.

Addition of oxygen only

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5.

In reaction 2HgCl₂ + SnCl₂ → Hg₂Cl₂ + SnCl₄, mercuric chloride (HgCl₂) is:

A.

Oxidised (addition of chlorine)

B.

Disproportionated

C.

Reduced (removal of chlorine, electronegative element)

D.

Neither oxidised nor reduced

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6.

The reaction 2K₄[Fe(CN)₆] + H₂O₂ → 2K₃[Fe(CN)₆] + 2KOH is classified as oxidation because:

A.

Oxygen is added

B.

Water is added

C.

Hydrogen is added

D.

Electropositive element potassium is removed from potassium ferrocyanide

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Redox Reactions NEET Questions

Redox Reactions MCQ Questions