Redox Reaction MCQ Questions & Answers in Physical Chemistry | Chemistry

Learn Redox Reaction MCQ questions & answers in Physical Chemistry are available for students perparing for IIT-JEE, NEET, Engineering and Medical Enternace exam.

121. A compound of $$Xe$$  and $$F$$  is found to have $$53.5\% $$  of $$Xe.$$  What is oxidation number of $$Xe$$  in this compound ?

A $$-4$$
B $$0$$
C $$+4$$
D $$+6$$
Answer :   $$+6$$

122. Which of the following is not a disproportionation reaction?

A $${P_4} + 5O{H^ - } \to {H_2}PO_2^ - + P{H_3}$$
B $$C{l_2} + O{H^ - } \to C{l^ - } + ClO$$
C $$2{H_2}{O_2} \to 2{H_2}O + {O_2}$$
D $$Pb{O_2} + {H_2}O \to PbO + {H_2}{O_2}$$
Answer :   $$Pb{O_2} + {H_2}O \to PbO + {H_2}{O_2}$$

123. The more positive the value of $${E^ \circ },$$  the greater is the tendency of the species to get reduced. Using the standard electrode potential of redox couples given below find out which of the following is the strongest oxidising agent.
$${E^ \circ }$$ values : $$\frac{{F{e^{3 + }}}}{{F{e^{2 + }}}} = + 0.77;\frac{{{I_{2\left( s \right)}}}}{{{I^ - }}} = + 0.54;$$       $$\frac{{C{u^{2 + }}}}{{Cu}} = + 0.34;\frac{{A{g^ + }}}{{Ag}} = + 0.80\,V$$

A $$F{e^{3 + }}$$
B $${I_{2\left( s \right)}}$$
C $$C{u^{2 + }}$$
D $$A{g^ + }$$
Answer :   $$A{g^ + }$$

124. The $${E^ \circ }$$ values of redox complex of halogens are given. Based on these values mark the correct statement. $$E_{\frac{{{I_2}}}{{{I^ - }}}}^ \circ = + 0.54\,V,E_{\frac{{B{r_2}}}{{B{r^ - }}}}^ \circ = + 1.08\,V,$$       $$E_{\frac{{C{l_2}}}{{C{l^ - }}}}^ \circ = + 1.36\,V,$$

A Chlorine can displace bromine and iodine from their salt solutions.
B Chlorine can only displace iodine from its salt solution.
C Bromine can displace chlorine from its salt solution.
D Iodine can displace chlorine and bromine from their salt solutions.
Answer :   Chlorine can displace bromine and iodine from their salt solutions.

125. The number of moles of $${K_2}C{r_2}{O_7}$$   reduced by one mole of $$S{n^{2 + }}$$  ions is

A $$\frac{1}{3}$$
B $$\frac{1}{6}$$
C $$\frac{2}{3}$$
D $$\frac{3}{4}$$
Answer :   $$\frac{1}{3}$$

126. In which of the following compounds, an element exhibits two different oxidation states?

A $$N{H_2}OH$$
B $$N{H_4}N{O_3}$$
C $${N_2}{H_4}$$
D $${N_3}H$$
Answer :   $$N{H_4}N{O_3}$$

127. What will be the balanced equation in acidic medium for the given reaction?
$$C{r_2}O_{7\left( {aq} \right)}^{2 - } + S{O_{2\left( g \right)}} \to Cr_{\left( {aq} \right)}^{3 + } + SO_{4\left( {aq} \right)}^{2 - }$$

A $$C{r_2}O_{7\left( {aq} \right)}^{2 - } + 3S{O_{2\left( g \right)}} + 2H_{\left( {aq} \right)}^ + \to $$       $$2Cr_{\left( {aq} \right)}^{3 + } + 3SO_{4\left( {aq} \right)}^{2 - } + {H_2}{O_{\left( l \right)}}$$
B $$2C{r_2}O_{7\left( {aq} \right)}^{2 - } + 3S{O_{2\left( g \right)}} + 4H_{\left( {aq} \right)}^ + \to $$       $$4Cr_{\left( {aq} \right)}^{3 + } + 3SO_{4\left( {aq} \right)}^{2 - } + 2{H_2}{O_{\left( l \right)}}$$
C $$C{r_2}O_{7\left( {aq} \right)}^{2 - } + 3S{O_{2\left( g \right)}} + 14H_{\left( {aq} \right)}^ + \to $$       $$2Cr_{\left( {aq} \right)}^{3 + } + 3SO_{4\left( {aq} \right)}^{2 - } + 7{H_2}{O_{\left( l \right)}}$$
D $$C{r_2}O_{7\left( {aq} \right)}^{2 - } + 6S{O_{2\left( g \right)}} + 7H_{\left( {aq} \right)}^ + \to $$       $$2Cr_{\left( {aq} \right)}^{3 + } + 6SO_{4\left( {aq} \right)}^{2 - } + 7{H_2}{O_{\left( l \right)}}$$
Answer :   $$C{r_2}O_{7\left( {aq} \right)}^{2 - } + 3S{O_{2\left( g \right)}} + 2H_{\left( {aq} \right)}^ + \to $$       $$2Cr_{\left( {aq} \right)}^{3 + } + 3SO_{4\left( {aq} \right)}^{2 - } + {H_2}{O_{\left( l \right)}}$$

128. Given
$$\eqalign{ & F{e^{3 + }}\left( {aq} \right) + {e^ - } \to F{e^{2 + }}\left( {aq} \right);{E^ \circ } = + 0.77\,V \cr & A{l^{3 + }}\left( {aq} \right) + 3{e^ - } \to Al\left( s \right);{E^ \circ } = - 1.66\,V \cr & B{r_2}\left( {aq} \right) + 2{e^ - } \to 2B{r^ - }\left( {aq} \right);{E^ \circ } = + 1.09\,V \cr} $$
Considering the electrode potentials, which of the following represents the correct order of reducing power?

A $$F{e^{2 + }} < Al < B{r^ - }$$
B $$B{r^ - } < F{e^{2 + }} < Al$$
C $$Al < B{r^ - } < F{e^{2 + }}$$
D $$Al < F{e^{2 + }} < B{r^ - }$$
Answer :   $$Al < F{e^{2 + }} < B{r^ - }$$

129. Which one of the following cannot function as an oxidising agent ?

A $${I^ - }$$
B $$S\left( s \right)$$
C $$NO_3^ - \left( {aq} \right)$$
D $$C{r_2}O_7^{2 - }$$
Answer :   $${I^ - }$$

130. Which of the following are the common oxidising agents used in redox titrations?

A $${K_2}C{r_2}{O_7},KMn{O_4},$$     Iodine
B $$FeS{O_4},KMn{O_4},$$    Sodium thiosulphate
C Oxalic acid, $$KMn{O_4},CuS{O_4}$$
D Mohr's salt, $$KI,$$  Sodium sulphate
Answer :   $${K_2}C{r_2}{O_7},KMn{O_4},$$     Iodine