KMnO_4 and K_2 Cr_2 O_7 are ......... agents and Na_2 ~S_2 O_7 is ......... agent.

KMnO_4 and K_2 Cr_2 O_7 are ......... agents and Na_2 ~S_2 O_7 is…

MCQ

$\mathrm{KMnO}_4$ and $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ are $.........$ agents and $\mathrm{Na}_2 \mathrm{~S}_2 \mathrm{O}_7$ is $.........$ agent.

A
Reducing, oxydising.
✓
Oxydising, reducing.
C
Reducing, reducing.
D
Oxydising, oxydising.

✓

Answer

Correct option: B.

Oxydising, reducing.

An oxidizing agent $($oxidant, oxidizer$)$ is a substance that has the ability to oxidize other substances $($cause them to lose electrons$)$.
$\mathrm{KMnO}_4$, $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ are oxidizing agent.
A reducing agent $($also called a reductant or reducer$)$ is an element $($such as calcium$)$ or compound that loses $($or "donates"$)$ an electron to another chemical species in a redox chemical reaction. Since the reducing agent is losing electrons, it is said to have been oxidized.
$\mathrm{Na}_2 \mathrm{~S}_2 \mathrm{O}_3$ is a reducing agent.