Question

“${\text{KMn}}{{\text{O}}_{\text{4}}}$ is kept in dark bottles because ${\text{KMn}}{{\text{O}}_{\text{4}}}$ is photosensitive”. Answer whether the above statement is true or false.
If true enter 1, else enter 0.

Answer 1

Hint: ${\text{KMn}}{{\text{O}}_{\text{4}}}$ is potassium permanganate. It is an inorganic compound composed of ${{\text{K}}^{\text{ + }}}$ and ${\text{MnO}}_{\text{4}}^{\text{ - }}$. If the ${\text{KMn}}{{\text{O}}_{\text{4}}}$ is a photosensitive, then there will be some changes will happen when it is get exposed to light.

Complete step by step answer:
The word photosensitive means some changes will happen when it gets exposed to light. Potassium permanganate (${\text{KMn}}{{\text{O}}_{\text{4}}}$) will decompose easily when it is exposed to sunlight. Under sunlight, the permanganate solution will decompose to give ${\text{Mn}}{{\text{O}}_{\text{2}}}$ and ${{\text{O}}_{\text{2}}}$. The decomposition reaction is as follows:
$2KMn{O_{4(aq)}} \to {K_2}Mn{O_{4(aq)}} + Mn{O_{2(aq)}} + {O_{2(g)}}$
$2KMn{O_{4(aq)}} \to {K_2}Mn{O_{4(aq)}} + Mn{O_{2(aq)}} + {O_{2(g)}}$
Dark bottles are used to cut off sunlight and so, ${\text{KMn}}{{\text{O}}_{\text{4}}}$ are stored in dark bottles.
So, ${\text{KMn}}{{\text{O}}_{\text{4}}}$ is photosensitive. Therefore, we can enter 1.

Additional Information:

• A small amount of light can provide enough energy for the permanganate to oxidize water.
• Potassium permanganate is not a primary standard.
• Potassium permanganate is an inorganic chemical compound and medication.
• ${\text{KMn}}{{\text{O}}_{\text{4}}}$ is used for cleaning wounds and dermatitis.
• ${\text{KMn}}{{\text{O}}_{\text{4}}}$is a strong oxidizing agent.
• Almost all applications of potassium permanganate exploit its oxidizing properties. As a strong oxidant that does not form toxic byproducts ${\text{KMn}}{{\text{O}}_{\text{4}}}$ has many niche uses.
• ${\text{KMn}}{{\text{O}}_{\text{4}}}$ is used extensively in the water treatment industry. It is used as a regeneration chemical to remove iron and hydrogen sulfide (rotten egg smell) from well water via a “Manganese Greensand” filter.
• A major application of ${\text{KMn}}{{\text{O}}_{\text{4}}}$is as a reagent for the synthesis of organic compounds.

Note: Potassium dichromate (${{\text{K}}_{\text{2}}}{\text{C}}{{\text{r}}_{\text{2}}}{{\text{O}}_{\text{7}}}$) is also a light sensitive substance. ${{\text{K}}_{\text{2}}}{\text{C}}{{\text{r}}_{\text{2}}}{{\text{O}}_{\text{7}}}$ is an orange coloured crystals used in dyeing as chromium mordant. In black and white image processing, potassium dichromate is used as an intensifier.