The number of electrons exchanged when K...

The number of electrons exchanged when `KMnO_(4)` react with `H_(2)O_(2)` is equal to that of

s electrons in Ca ( at. no. : 20)

p electrons in neon (at. no. : 10)

d electrons in chromium ( at. No. : 24)

f electron in lanthanum ( at. no. : 57)

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