Question

KMno4 can be prepared from K2MnO4 as per the reaction :
3MnO2−4+2H2O⇌2MnO−4+MnO2+4OH−.
The reaction can go to completion by removing OH− ions by adding -

Answer 1

Answer:Correct answer is CO2

Explanation: To remove OH- ion a weak acid is required because a strong acid reverse the reaction. So here,

1- HCl is a strong acid so it reverse the reaction.

2-KOH is strong base which will increase OH- concentration.

3-SO2 will react with water to form a strong acid H2SO4.

4-CO2 combines with OH- ion to give carbonate which is easily removed.

Hey it's easy, I know you can do it easily next time.