Practice Oxidation Reduction Multiple Choice Questions with Answers Quiz-1

Q.1.

What is the oxidation state of sulphur in SO(aq)?

4
6
2
0

Q.2.

Which of the following elements is the strongest oxidizing agent?

Chlorine
Aluminium
Hydrogen
Lithium

Q.3.

What is the oxidation number assigned to manganese in KMnO4?

7
5
4
0

Q.4.

In the reaction 2Ca(s) + O2(g) --> 2CaO(s), calcium is __________

Reduced
Synthesized
Oxidized
None of the above

Q.5.

A galvanic cell was created with a Calcium and a Copper cell. Which is the correct half equation at the anode?

Ca2+(aq)+2e−⟺ Ca(s)Ca^{2+}\left(aq\right)+2e^-\Longleftrightarrow\ Ca\left(s\right)Ca2+(aq)+2e−⟺ Ca(s)
Ca++e−⟺ Ca(s)Ca^++e^-\Longleftrightarrow\ Ca\left(s\right)Ca++e−⟺ Ca(s)
Cu2+(aq) + e− ⟺ Cu+(aq)Cu^{2+}\left(aq\right)\ +\ e^-\ \Longleftrightarrow\ Cu^+\left(aq\right)Cu2+(aq) + e− ⟺ Cu+(aq)
Cu2+(aq) + 2e− ⟺ Cu(s)Cu^{2+}\left(aq\right)\ +\ 2e^-\ \Longleftrightarrow\ Cu\left(s\right)Cu2+(aq) + 2e− ⟺ Cu(s)

Q.6.

Based on this equation: 2 I- + 2 Fe → 2Fe + I Which of the following is true about the ionic equation?

Fe3+ is oxidized
Fe3+ is a reducing agent
I- is an oxidizing agent
I- donates electrons to Fe3+

Q.7.

In the reaction Zn + H--> ZnO2 + H2 which element, if any, is oxidized?

Zinc
Hydrogen
Oxygen
None

Q.8.

Find the oxidation number of Ca in CaH2

-2
-4
+2
+4
0

Q.9.

Find the oxidation number of S in S2O4 2-

+3
+6
-6
-3
-4

Q.10.

In an electrochemical cell, tin becomes a negative terminal when it is connected to

aluminium
lead
magnesium
zinc

Q.11.

A mixture of magnesium oxide, copper(II) oxide and zinc powder is heated in a crucible until no further changes are observed. After heating, the mixture contains:

magnesium, copper(II) oxide and zinc
magnesium oxide, copper and zinc oxide
magnesium oxide, copper(II) oxide and zinc
magnesium, copper and zinc oxide

Q.12.

Which of the following statements is not true when zinc powder is added to dilute hydrochloric acid?

Zinc is oxidised
Chloride ion acts as an oxidising agent
Hydrogen ion is reduced
Electrons are transferred in the reaction

Q.13.

In a redox reaction, spectator ions...

become oxidised
become reduced
remain unchanged
All of above

Q.14.

Another name for a "oxidation-reduction" reaction is

chemical reaction
neutralization reaction
redox reaction
nuclear reaction

Q.15.

Oxidation is the _________ of electrons.

loss
gain
sharing
transfer

Q.16.

Gaining hydrogen is an example of...

oxidation
reduction

Q.17.

Gaining oxygen is an example of...

oxidation
reduction

Q.18.

Which of the following half reactions correctly represents a reduction half reaction?

Fe →Fe2+ + 2e-
Pb4+ + 2e- →Pb2+
2O-2 →O2 + 4e-
Fe + 3e- →Fe3+

Q.19.

In a reaction, copper is reduced; its number of electrons has:

Increased
Decreased
Remained Constant
Varies Randomly

Q.20.

If an atom loses electrons during a chemical reaction, the atom was:

Oxidized
Reduced
Neutralized
Precipitated

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