Which one is correct?

Pb(NO3)2----->PbO+2NO2+O2

or

2Pb(NO3)2----->2PbO+4NO2+O2

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Solution

1) Pb(NO3)2----->PbO+2NO2+O2

2) 2Pb(NO3)2----->2PbO+4NO2+O2

Here in the 1st equation no.of Oxygen atoms is not balanced
No. of Oxygen atom in LHS = 6
No. of Oxygen atom in RHS = 7
LHS not equal to RHS. Hence wrong

In the 2nd equation no. of Oxygen atoms are balaanced
No. of Oxygen atom in LHS = 12
No. of Oxygen atom in RHS = 12
LHS equal to RHS. Hence correct

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