Question

(111) Salt R is black in colour. On reacting with concentrated HCl, it liberates a
pungent greenish yellow gas which turns moist starch iodide paper blue
black.identify salt R.​

Answer 1

Manganese Dioxide (MnO2)

Answer 2

It is Manganese Dioxide (MnO2)

Explanation:

• As we know that the gas emitted is pungent and greenish in color, this shows the gas is chlorine gas
• The chlorine gas also turns moist starch iodide paper blue
• Also when this salt has reacted with the concentrated HCl acid, the salt is also black
• This shows it is Manganese Dioxide (MnO2)