6. Oxidation and Reduction

Q- The oxidation number of nitrogen in NO3 – is
(a) –1 (b) +2
(c) +3 (d) +5
Ans: (d)

Q- A reducing agent is a substance which can
(a) accept electrons
(b) donate electrons
(c) accept protons
(d) donate protons
Ans: (b)

Q- Oxidation is defined as
(a) loss of electrons
(b) gain of electrons
(c) gain of protons
(d) loss of protons
Ans: (a)

Q- What is the oxidation number of sulphur in 2 SO4−ion?
(a) –2
(b) +2
(c) +6
(d) 8
Ans: (c)

Q- In redox reaction, Na2S2O3 changes to Na2S4O6. What is the equivalent weight of Na2S3O3?
(a) Same as its molecular weight
(b) 1/2 × its molecular weight
(c) 1/3 × its molecular weight
(d) 1/4 × its molecular weight
Ans: (a)

Q- Starch iodide paper is used to test for the presence of
(a) iodine (b) iodide iron
(c) oxidising agent
(d) reducing agent
Ans: (c)

Q- The conversion of Fe++ to Fe+++ is
(a) oxidation
(b) reduction
(c) ionisation
(d) nuclear reaction
Ans: (a)

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