Redox Reactions NDA Questions

NDA Chemistry

Redox Reactions MCQ Questions


7.
In the reaction 2Na + Cl2 -> 2NaCl, sodium metal is oxidised because each sodium atom:
A.
Gains one electron to form Na+
B.
Gains one proton
C.
Shares an electron pair equally with chlorine
D.
Loses one electron to form Na+
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ANSWER :
D. Loses one electron to form Na+
8.
In the same reaction 2Na + Cl2 -> 2NaCl, each chlorine atom is reduced because it:
A.
Gains one electron to form Cl-
B.
Gains a neutron
C.
Loses one electron to form Cl-
D.
Loses a proton
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ANSWER :
A. Gains one electron to form Cl-
9.
A redox reaction can be conceptually split into two half-reactions. These are called the:
A.
Forward half and reverse half
B.
Neutralisation half and hydrolysis half
C.
Combination half and decomposition half
D.
Oxidation half-reaction and reduction half-reaction
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ANSWER :
D. Oxidation half-reaction and reduction half-reaction
10.
In any redox reaction, the total number of electrons lost during oxidation must be:
A.
Exactly equal to the total number of electrons gained during reduction
B.
Always less than the electrons gained during reduction
C.
Unrelated to the electrons gained during reduction
D.
Always greater than the electrons gained during reduction
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ANSWER :
A. Exactly equal to the total number of electrons gained during reduction
11.
In the half-reaction Zn(s) -> Zn2+(aq) + 2e-, the species Zn(s) is behaving as a:
A.
Spectator ion
B.
Reducing agent, since it loses electrons and is itself oxidised
C.
Catalyst, since it is unaffected by the reaction
D.
Oxidising agent, since it gains electrons
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ANSWER :
B. Reducing agent, since it loses electrons and is itself oxidised
12.
A species that gains electrons (and is itself reduced) while oxidising another species is called a/an:
A.
Oxidising agent (oxidant)
B.
Buffer
C.
Reducing agent (reductant)
D.
Catalyst
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ANSWER :
A. Oxidising agent (oxidant)