The correct order of N-compounds in its decreasing order of oxidation states is

Options

A. `HNO_(3),NO,N_(2),NH_(4)Cl`
B. `HNO_(3),NO,NH_(4)Cl_(4),N_(2)`
C. `HNO_(3),NH_(4)Cl,NO,N_(2)`
D. `NH_(4)Cl,N_(2),NO,HNO_(3)`

Answer

To determine the correct order of nitrogen compounds in decreasing order of oxidation states, we will analyze each compound step by step.

### Step 1: Determine the oxidation state of nitrogen in HNO3 (Nitric Acid)
1. Let the oxidation state of nitrogen be \( x \).
2. The oxidation state of hydrogen (H) is +1, and for each oxygen (O), it is -2.
3. The formula for HNO3 can be set up as follows:
\[ x + 1 + 3(-2) = 0 \]
4. Simplifying this gives:
\[ x + 1 - 6 = 0 \implies x - 5 = 0 \implies x = +5 \]

### Step 2: Determine the oxidation state of nitrogen in NO (Nitric Oxide)
1. Let the oxidation state of nitrogen be \( x \).
2. The oxidation state of oxygen is -2.
3. The formula for NO can be set up as follows:
\[ x + (-2) = 0 \]
4. Simplifying this gives:
\[ x - 2 = 0 \implies x = +2 \]

### Step 3: Determine the oxidation state of nitrogen in N2 (Elemental Nitrogen)
1. In elemental form, the oxidation state of nitrogen is 0.
\[ x = 0 \]

### Step 4: Determine the oxidation state of nitrogen in Ammonium Chloride (NH4Cl)
1. Let the oxidation state of nitrogen be \( x \).
2. The oxidation states of hydrogen are +1 (for 4 hydrogens) and chlorine is -1.
3. The formula for NH4Cl can be set up as follows:
\[ x + 4(1) + (-1) = 0 \]
4. Simplifying this gives:
\[ x + 4 - 1 = 0 \implies x + 3 = 0 \implies x = -3 \]

### Step 5: Compile the oxidation states
- HNO3: +5
- NO: +2
- N2: 0
- NH4Cl: -3

### Step 6: Arrange in decreasing order
The decreasing order of oxidation states of nitrogen compounds is:
1. HNO3: +5
2. NO: +2
3. N2: 0
4. NH4Cl: -3

Thus, the correct order of nitrogen compounds in decreasing order of oxidation states is:
**HNO3 > NO > N2 > NH4Cl**

### Final Answer
The correct order of nitrogen compounds in decreasing order of oxidation states is:
**HNO3, NO, N2, NH4Cl**

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