Arrange the following molecules in the decreasing order of oxidation state (+ve to -ve) of nitrogen : `NO_2, NH_3, HN_3, NO_2^(-) , N_2H_4`.

Explanation

To solve the problem of arranging the molecules in decreasing order of the oxidation state of nitrogen, we will calculate the oxidation state of nitrogen in each compound step by step.

### Step 1: Calculate the oxidation state of nitrogen in NO₂
- The formula for calculating the oxidation state is:
\[ x + 2(-2) = 0 \]
where \( x \) is the oxidation state of nitrogen and \(-2\) is the oxidation state of oxygen.
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