Redox Reactions NDA Questions

NDA Chemistry

Redox Reactions MCQ Questions


13.
A species that loses electrons (and is itself oxidised) while reducing another species is called a/an:
A.
Indicator
B.
Electrolyte
C.
Oxidising agent (oxidant)
D.
Reducing agent (reductant)
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ANSWER :
D. Reducing agent (reductant)
14.
Which of the following is commonly used as a strong oxidising agent in redox titrations because of its intense purple colour and self-indicating end point?
A.
Sodium chloride
B.
Sodium thiosulphate
C.
Distilled water
D.
Potassium permanganate (KMnO4)
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ANSWER :
D. Potassium permanganate (KMnO4)
15.
Potassium dichromate (K2Cr2O7) is widely used in volumetric analysis as a strong:
A.
Complexing agent only
B.
Oxidising agent
C.
Reducing agent
D.
Neutralising agent
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ANSWER :
B. Oxidising agent
16.
Sulphur dioxide (SO2) commonly acts as a reducing agent in most of its reactions, but in the presence of an even stronger reducing agent such as hydrogen sulphide (H2S), it can act as a/an:
A.
Indicator
B.
Neutral spectator
C.
Catalyst only
D.
Oxidising agent
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ANSWER :
D. Oxidising agent
17.
Which of the following gases is well known as a strong reducing agent, commonly used to reduce heated metal oxides to the corresponding metals?
A.
Nitrogen
B.
Hydrogen
C.
Oxygen
D.
Carbon dioxide
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ANSWER :
B. Hydrogen
18.
Ferrous ions (Fe2+) can act as a reducing agent because they can readily be oxidised to:
A.
Fe4+ by losing three electrons
B.
FeO by gaining oxygen only
C.
Fe metal by gaining electrons
D.
Fe3+ (ferric ion) by losing an electron
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ANSWER :
D. Fe3+ (ferric ion) by losing an electron