In order for carbon to be stable and have 8 electrons, it must make 4 total covalent bonds.
In prefer for oxygen to be stable and have 8 electrons, it must make 2 covalent bonds.
So, we can deduce that CO2 looks like this:
O=C=O
This molecule has two double bonds.
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You would calculate them by dividing them and then multiplying to get the final answer
Answer: option 2
Explanation: each nitrogen is reduced from zero to -3 and Each H is Oxidised from 0 to +1
Since oxidation no of Nitrogen in molecular N2 is always zero and for H2 also zero.
In NH3, x+3(+1)=0
X+3=0
X=-3
And and hydrogen shows +1 Oxidation no when it is combined with non metal(like N,O,cl) and with -2 with metal like Na,Ca etc.
And zero in molecular form H2.