AIPMT - 25th July 2015

Identify the incorrect statement from the following

The oxidation number of the underlined atom in the following species is given. Identify the incorrect statement.

Identify the incorrect statement.

What is the change in oxidation number of carbon in the following reaction?
${\mathrm{CH}}_4\left(\mathrm{g}\right)+4{\mathrm{Cl}}_2\left(\mathrm{g}\right)\to {\mathrm{CCl}}_4+4\mathrm{HCl}\left(\mathrm{g}\right)$

In acidic medium, ${\mathrm{H}}_2{\mathrm{O}}_2$ changes $\mathrm{C}{\mathrm{r}}_2{\mathrm{O}}_7^{-2}$ to $\mathrm{C}\mathrm{r}{\mathrm{O}}_5$ which has two $\left(-\mathrm{O}-\mathrm{O}-\right)$ bonds Oxidation state of $\mathrm{C}\mathrm{r}$ in $\mathrm{C}\mathrm{r}{\mathrm{O}}_5$ is:

Which of the following reactions is the metal displacement reaction? Choose the right option.

The pair of compounds that can exist together is:

$\left(\mathrm{a}\right) {\mathrm{H}}_2{\mathrm{O}}_2+{\mathrm{O}}_3\to {\mathrm{H}}_2\mathrm{O}+2{\mathrm{O}}_2$
${\left(\mathrm{b}\right)\mathrm{ }\mathrm{H}}_2{\mathrm{O}}_2+\mathrm{A}{\mathrm{g}}_2\mathrm{O}\to 2\mathrm{A}\mathrm{g}+{\mathrm{H}}_2\mathrm{O}+{\mathrm{O}}_2$
Role of hydrogen peroxide in the above reactions is respectively: