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Question

The secondary reactions which takes place in dry cell are:

1)MnO2+NH+4+eMnO(OH)+NH3

2)2NH4Cl+2(OH) 2NH3+2Cl+ 2H2O

3) Zn+2MnO2 [Zn(NH3)2]+2OH+2MnO(OH)

4) Zn2+2NH3+2Cl [Zn(NH3)2]Cl2 or ZnCl2.2NH3

Correct statements are:


A
1,2,4
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B
1,2,3,4
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C
2,4
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D
Only 4
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