Assertion NH4 ​ NO3 ​ undergoes a redox reaction to give N 2 ​ O and H 2 ​ O. Reason It is a disproportionation reaction

Options

A. Both, A and R, are true and R is the correct explanation of A
B. Both, A and R, are true but R is not the correct explanation of A.
C. If A is true but R is false
D. If A is false but R is true.

Explanation

To solve the question, we need to analyze both the assertion and the reason provided.

### Step 1: Analyze the Assertion
The assertion states that NH4NO3 (ammonium nitrate) undergoes a redox reaction to produce N2O (nitrous oxide) and H2O (water).

- **Redox Reaction**: A redox reaction involves the transfer of electrons, resulting in changes in oxidation states of the reactants. In this case, we need to check if the nitrogen in NH4NO3 is changing its oxidation state when it forms N2O and H2O.

### Step 2: Determine the Oxidation States
In NH4NO3:
- The oxidation state of nitrogen in NH4+ is -3.
- The oxidation state of nitrogen in NO3- is +5.

In the products:
- The oxidation state of nitrogen in N2O is +1 (for each nitrogen atom, since there are two nitrogen atoms).
- The oxidation state of oxygen in H2O is -2.

### Step 3: Check for Redox Changes
In the reaction:
- The nitrogen in NH4+ goes from -3 to +1 (oxidation).
- The nitrogen in NO3- goes from +5 to +1 (reduction).

Since there are changes in oxidation states, this confirms that the reaction is indeed a redox reaction.

### Step 4: Analyze the Reason
The reason states that the reaction is a disproportionation reaction. A disproportionation reaction is a specific type of redox reaction where a single substance is both oxidized and reduced to form two different products.

In this case, we have two different nitrogen atoms in NH4NO3 undergoing different changes in oxidation states:
- One nitrogen is oxidized (from -3 to +1).
- The other nitrogen is reduced (from +5 to +1).

Since both nitrogen atoms are not changing to the same oxidation state, this does not qualify as a disproportionation reaction.

### Conclusion
- The assertion (A) is true: NH4NO3 does undergo a redox reaction to produce N2O and H2O.
- The reason (R) is false: The reaction is not a disproportionation reaction.

### Final Answer
Thus, the correct conclusion is that the assertion is true, but the reason is false. Therefore, the answer is option 3: A is true but R is false.

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