KMnO4 can be prepared from K2MnO4 as per reaction,

 3MnO42-+2H2O2MnO4-+MnO2+4OH-

The reaction can go to completion by removing OH- ions by adding             

1. HCl

2. KOH

3. CO2

4. SO2

Subtopic:  Introduction To Equilibrium |
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The active mass of 5.6 L \(O_2\) gas at NTP is:
1.  0.25 Mol/L
2.  \({1 \over 22.4 } Mol /L\)
3. 0.175 Mol/L
4.  \({ 1 \over 5.6}~ Mol / L\)
Subtopic:  Introduction To Equilibrium |
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10 gm CaCO3 is taken in a one litre container. The active mass of CaCO3 is: 

1. 0.1

2. 1

3. zero

4. 10

Subtopic:  Introduction To Equilibrium |
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