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The oxidation state of the most electronegative element in the products of the reaction between ${\mathrm{BaO}}_2$ and ${\mathrm{H}}_2{\mathrm{SO}}_4$ are :
1. 0 and -1
2. -1 and -2
3. -2 and 0
4. -2 and +1

Among the properties (i) reducing (ii) oxidizing (iii) complexing the set of properties shown by ${\mathrm{CN}}^{-}$ ion towards metal species is:
1. i, ii, iii
2. ii, iii
3. iii, i
4. i, ii

The correct order of reducing the power of the halide ions is:
1. ${\mathrm{Cl}}^{-} > {\mathrm{Br}}^{-} > {\mathrm{I}}^{-} > {\mathrm{F}}^{-}$
2. ${\mathrm{Cl}}^{-} > {\mathrm{I}}^{-} > {\mathrm{Br}}^{-} > {\mathrm{F}}^{-}$
3. ${\mathrm{Br}}^{-} > {\mathrm{Cl}}^{-} > {\mathrm{I}}^{-} > {\mathrm{F}}^{-}$
4. ${\mathrm{I}}^{-} > {\mathrm{Br}}^{-} > {\mathrm{Cl}}^{-} > {\mathrm{F}}^{-}$

Which is the best description of the behavior of bromine in the reaction below?
${\mathrm{H}}_2\mathrm{O}+{\mathrm{Br}}_2\to \mathrm{HOBr}+\mathrm{HBr}$
1. Proton acceptor only
2. Both oxidized and reduced
3. Oxidized only
4. Reduced only

In the reaction ${\mathrm{A}}_{\mathrm{s}}2{\mathrm{S}}_3 + {\mathrm{HNO}}_3 \to {\mathrm{H}}_3{\mathrm{AsO}}_4+{\mathrm{H}}_2{\mathrm{SO}}_4 + \mathrm{NO}$, the element oxidized is/are :
1. As only
2. S only
3. N only
4. As and S both

Which substance serves as a reducing agent in the following reaction, $14{\mathrm{H}}^{+} + {\mathrm{Cr}}_2{\mathrm{O}}_7^{2-} + 3\mathrm{Ni} \to 2{\mathrm{Cr}}^{3+} + 7{\mathrm{H}}_2\mathrm{O} + 3{\mathrm{Ni}}^{2+}$?
1. ${\mathrm{H}}_2\mathrm{O}$
2. Ni
3. ${\mathrm{H}}^{+}$
4. ${\mathrm{Cr}}_2{\mathrm{O}}_7^{2-}$

The reaction, $3{\mathrm{ClO}}^{-}\left(\mathrm{aq}\right) \to {\mathrm{ClO}}_3^{-}\left(\mathrm{aq}\right) + 2{\mathrm{Cl}}^{-}\left(\mathrm{aq}\right)$ is an example of:
1. Oxidation reaction
2. Reduction reaction
3. Disproportionation reaction
4. Decomposition reaction

Maximum oxidation state is present in:
1. ${\mathrm{CrO}}_2{\mathrm{Cl}}_2 \mathrm{and} {\mathrm{MnO}}_4^{-}$
2. ${\mathrm{MnO}}_2$
3. ${\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]}^{3-} \mathrm{and} {\left[\mathrm{Co}{\left(\mathrm{CN}\right)}_6\right]}^{3-}$
4. MnO

The reaction is balanced if, $5{\mathrm{H}}_2{\mathrm{O}}_2 + {\mathrm{XCIO}}_2 + 2{\mathrm{OH}}^{-} \to {\mathrm{XCI}}^{-} + {\mathrm{YO}}_2 + 6{\mathrm{H}}_2\mathrm{O}$
1. X = 5, y = 2
2. X = 2, Y = 5
3. X = 4, Y = 10
4. X = 5, y = 5

In balancing the half-reaction, ${\mathrm{S}}_2{\mathrm{O}}_3^{2-} \to \mathrm{S}\left(\mathrm{s}\right)$, the number of electrons that must be added is :
1. 2 on the right
2. 2 on the left
3. 3 on the right
4. 4 on the left

In which of the following compounds, the oxidation number of iodine is fractional?
1. ${\mathrm{IF}}_7$
2. ${\mathrm{I}}_3^{-}$
3. ${\mathrm{IF}}_5$
4. ${\mathrm{IF}}_3$