Question

Write a balanced chemical reaction where the substance changes color from black to white.

On the 8^th of November 2016, Prime Minister Narendra Modi announced the banning of all rupees 500 and rupees 1000 banknotes in circulation.

1. What was the decision termed in a single word?
2. How did it help in changing the color of money from black to white?

Answer 1

In presence of Hydrogen peroxide, black lead sulfide gets converted into white lead sulfate.

The chemical reaction for the same is as follows:

$\underset{\underset{\left(Black\right)}{\underbrace{(Leadsulphide)}}}{\underbrace{PbS\left(s\right)}}+\underset{(Hydrogenperoxide)}{\underbrace{4H_2{O}_2\left(aq\right)}}\to \underset{\left(White\right)}{\underbrace{\underset{(Leadsulphate)}{\underbrace{PbS{O}_4\left(s\right)}}}}+\underset{\left(Water\right)}{\underbrace{4H_{2}O\left(l\right)}}$

1. Prime minister Narendra Modi banned the circulation of notes of $500$ and $1000$, on 8^th November 2016, the decision is termed demonization.
2. The decision of demonetization helped to get rid of black money, and it converted most of the black money into white money. During demonetization since notes of $500$ and $1000$ were banned and a major chunk of black money was stored in the same currency so to exchange and renew the money, all the black money was taken to the bank with the identity of the person so it became white money.