111. Which of the following is a disproportionation reaction?
A
$$C{l_{2\left( g \right)}} + 2O{H^ - }_{\left( {aq} \right)} \to $$ $$Cl{O^ - }_{\left( {aq} \right)} + C{l^ - }_{\left( {aq} \right)} + {H_2}{O_{\left( l \right)}}$$
B
$$C{l_{2\left( g \right)}} + 2{I^ - }_{\left( {aq} \right)} \to 2C{l^ - }_{\left( {aq} \right)} + {I_{2\left( s \right)}}$$
C
\[2F{{e}_{\left( s \right)}}+3{{H}_{2}}{{O}_{\left( l \right)}}\xrightarrow{\Delta }\] \[F{{e}_{2}}{{O}_{3\left( s \right)}}+3{{H}_{2\left( g \right)}}\]
D
$$2{H_2}{O_{\left( l \right)}} + 2{F_{2\left( g \right)}} \to 4H{F_{\left( {aq} \right)}} + {O_{2\left( g \right)}}$$
Answer :
$$C{l_{2\left( g \right)}} + 2O{H^ - }_{\left( {aq} \right)} \to $$ $$Cl{O^ - }_{\left( {aq} \right)} + C{l^ - }_{\left( {aq} \right)} + {H_2}{O_{\left( l \right)}}$$
112. Which compound amongst the following has the highest oxidation number of $$Mn?$$
A
$$KMn{O_4}$$
B
$${K_2}Mn{O_4}$$
C
$$Mn{O_2}$$
D
$$M{n_2}{O_3}$$
Answer :
$$KMn{O_4}$$
113. The element that does not show positive oxidation state is
A
$$O$$
B
$$N$$
C
$$Cl$$
D
$$F$$
Answer :
$$F$$
114.
Which of the following statements is not correct about the reaction given below?
\[{{K}_{4}}\left[ Fe{{\left( CN \right)}_{6}} \right]\xrightarrow{\text{Oxidation}}F{{e}^{3+}}+C{{O}_{2}}+NO_{3}^{-}\]
A
$$Fe$$ is oxidised from \[F{{e}^{2+}}\] to \[F{{e}^{3+}}.\]
B
Carbon is oxidised from $${C^{2 + }}$$ to $${C^{4 + }}$$
C
$$N$$ is oxidised from $${N^{3 - }}$$ to $${N^{5 + }}.$$
D
Carbon is not oxidised.
Answer :
Carbon is not oxidised.
115. What is the oxidation number of carbon in $${C_3}{O_2}$$ ( carbon suboxide )?
A
$$ + \frac{4}{3}$$
B
$$ + \frac{{10}}{4}$$
C
$$ + 2$$
D
$$ + \frac{2}{3}$$
Answer :
$$ + \frac{4}{3}$$
116. Which is not true about the oxidation state of the following elements?
A
Sulphur + 6 to - 2
B
Carbon + 4 to - 4
C
Chlorine + 7 to - 1
D
Nitrogen + 3 to - 1
Answer :
Nitrogen + 3 to - 1
117. Which of the following acts as a self-indicator?
A
$${K_2}C{r_2}{O_7}$$
B
$$KMn{O_4}$$
C
$${\text{Oxalic acid}}$$
D
$${\text{Iodine}}$$
Answer :
$$KMn{O_4}$$
118. Identify disproportionation reaction.
A
$$C{H_4} + 2{O_2} \to C{O_2} + 2{H_2}O$$
B
$$C{H_4} + 4C{l_2} \to CC{l_4} + 4HCl$$
C
$$2{F_2} + 2O{H^ - } \to $$ $$2{F^ - } + O{F_2} + {H_2}O$$
D
$$2N{O_2} + 2O{H^ - } \to $$ $$NO_2^ - + NO_3^ - + {H_2}O$$
Answer :
$$2N{O_2} + 2O{H^ - } \to $$ $$NO_2^ - + NO_3^ - + {H_2}O$$
119. The oxidation state of molybdenum in its $$oxo$$ complex species $${\left[ {M{o_2}{O_4}{{\left( {{C_2}{H_4}} \right)}_2}\left( {{H_2}{O_2}} \right)} \right]^{2 - }}$$ is
A
+ 2
B
+ 3
C
+ 4
D
+ 5
Answer :
+ 3
120. For the reaction : $$N{H_3} + OC{l^ - } \to {N_2}{H_4} + C{l^ - }$$ in basic medium, the coefficients of $$N{H_3},OC{l^ - }$$ and $${N_2}{H_4}$$ for the balanced equation are respectively
A
2, 2, 2
B
2, 2, 1
C
2, 1, 1
D
4, 4, 2
Answer :
2, 1, 1