The autocatalyst in the redox reaction involving acidified potassium permanganate and oxalic acid is

Identify the redox reaction out of the following reactions and identify the oxidising and reducing agents in them.
$(d)$ $PCl_{3(l)} + 3H_2O_{(l)} \to 3HCl_{(aq)} + H_3PO_{3(aq)}$
$(e)$ $4NH_{3(aq)} + 3O_{2(g)} \to 2N_{2(g)} + 6H_2O_{(g)}$

Which gases are formed by the oxidation of carbon with concentrated $H_2SO_4$?

Assign $A, B, C, D$ for the given type of reaction:
$Mn(NO_3)_2 + 2NaOH \longrightarrow Mn(OH)_2 \downarrow + 2NaNO_3$

In which of the following conversions does a blue colour appear?

Assertion $(A)$: Ferricyanide ion oxidises $H_2O_2$ to $H_2O$ in basic medium.
Reason $(R)$: Oxidation product of $H_2O_2$ is $O_2$. Which of the following is true?