Which of the following act as reducing agents ?
$$\eqalign{
& {\text{(i)}}\,PO_4^{3 - } \cr
& {\text{(ii)}}\,S{O_3} \cr
& {\text{(iii)}}\,PO_3^{2 - } \cr
& {\text{(iv)}}\,N{H_3} \cr} $$
A.
(i), (ii) and (iii)
B.
Only (iii)
C.
(i), (iii) and (iv)
D.
(iii) and (iv)
Answer :
(iii) and (iv)
Solution :
In (i) and (ii) both $$P$$ and $$S$$ are in highest oxidation state. In (iii) and (iv) ; $$P$$ has oxidation state of $$+4$$ which can be oxidized to $$+5$$ state, while in case of $$N{H_3}$$ nitrogen has oxidation state of $$–3$$ which can be oxidised.
Releted MCQ Question on Physical Chemistry >> Redox Reaction
Releted Question 1
Which of the following represents a redox reaction?
A.
$$NaOH + HCl \to NaCl + {H_2}O$$
B.
$$BaC{l_2} + {H_2}S{O_4} \to BaS{O_4} + 2HCl$$
C.
$$CuS{O_4} + 2{H_2}O \to Cu{\left( {OH} \right)_2} + {H_2}S{O_4}$$