I. For the reaction: $2Fe+3CdC{l}_2$Longleftrightarrow$===>2FeC{l}_3+3Cd,$ which statement is true?

$($A$)Fe$ is the oxidizing agent

$($B$)$ Cd undergoes oxidation

$($C$)Cd$ is the reducing agent

$($D$)$ Fe undergoes oxidation half$-$cells?

$Z{n}^{2+}+2e^{-}-$cdotsZn,$E=-0\mathrm{.}763V$

$A{g}^{+}+e^{--\text{c}\text{d}\text{o}\text{t}\text{s}Ag},E=0\mathrm{.}799V$

$($A$)-2\mathrm{.}361V$

$($B$)-1\mathrm{.}562V$

$($C$)1\mathrm{.}562V$

$($D$)2\mathrm{.}361V$

$3.$ What is the oxidation state of arsenic in $H_{3}As{O}_3?$

$($A$)+1$

$($B$)+3$

$($C$)+5$

$($D$)+7$

$4.$ The oxidation state of $S$ in $S_2{O}_8^{2-}$ is:

$($A$)-2$

$($B$)+7$

$($C$)+8$

$($D$)+14$

$5.$ Select the set of coefficients which balance the chemical equation:

$B_3{N}_3{H}_6+O_{2}cdots{N}_2{O}_5+B_2{O}_3+H_{2}O$

$($A$)1,5,1,1,2$

$($B$)1,15,3,3,6$

$($C$)2,5,3,3,3$

$($D$)2,15,3,3,6$

$6.$ Electrons are lost by the

$($A$)$ reducing agent as it undergoes oxidation.

$($B$)$ reducing agent as it undergoes reduction.

$($C$)$ oxidizing agent as it undergoes oxidation.

$($D$)$ oxidizing agent as it undergoes reduction.

$7.$ As an element is oxidized, its oxidation number

$($A$)$ increases as electrons are lost.

$($B$)$ increases as electrons are gained.

$($C$)$ decreases as electrons are lost.

$($D$)$ decreases as electrons are gained.

$8.$ In which of the following unbalanced equations does chromium undergo oxidation?

$($A$)C{r}^{3+}Cr$

$($B$)C{r}^{3+}C{r}^{2+}$

$($C$)C{r}^{3+}C{r}_2{O}_7^{2-}$

$($D$)Cr{O}_4^{2-}C{r}_2{O}_7^{2-}$