The Question is from neet-chemistry classification-of-elements , and it was created by the author Mr. S M HUSSAIN

Question

Which of the following is NOT a characteristic of $N_2O_5$?

Mr. S M HUSSAIN · Accepted Answer

## CORE INFORMATION
✓ **Answer**: [B]
## CONCEPT FRAMEWORK
**Primary Concept**: Chemical Properties of Oxides
**Related Topics**: Acidic Oxides, Nitrogen Oxides, Chemical Reactions
**Prerequisites**: Understanding of acidic oxides and their reactions with water, knowledge of the structure of $N_2O_5$
## SOLUTION PATHWAY
**Given Information**:
  *  We need to identify the statement that is NOT true for $N_2O_5$.

**Method & Steps**:
 1.  Analyze the given options based on the known properties of $N_2O_5$.

2. Check if $N_2O_5$ is an acidic oxide:
        Reasoning: $N_2O_5$ is an oxide of a non-metal, and oxides of non-metals are generally acidic.
        Formula/Rule: Non-metal oxides are acidic.
  3.  Check if $N_2O_5$ forms $HNO_3$ when dissolved in water:
        Working: The reaction of $N_2O_5$ with water is: $N_2O_5 + H_2O ightarrow 2HNO_3$.
        Key Point: This reaction is how nitric acid ($HNO_3$) is formed from $N_2O_5$.
  4.  Check the structure of solid $N_2O_5$:
        Working: In the solid-state, $N_2O_5$ exists as the ionic compound nitronium nitrate ($NO_2^+NO_3^-$).
        Key Point: $NO_2^+$ is the nitronium ion, and $NO_3^-$ is the nitrate ion.
  5. Analyze the option regarding its appearance as a gas:
       Reasoning: $N_2O_5$ is a colorless solid and sublimes to form a colorless gas at room temperature.

**Result**: Option B is the incorrect statement about $N_2O_5$.
**Verification**: Comparing the options with known properties confirms that only option B is false.
 ## OPTION ANALYSIS
[A] :x: It is an acidic oxide. - This statement is true. $N_2O_5$ is the anhydride of nitric acid.
[B] ✓: It exists as a brown gas at room temperature. - This statement is FALSE. $N_2O_5$ is a colorless solid and forms a colorless gas upon sublimation.
[C] :x: It forms $HNO_3$ when dissolved in water. - This statement is true, as shown by the reaction $N_2O_5 + H_2O ightarrow 2HNO_3$.
[D] :x: In solid state, it exists as $NO_2^+NO_3^-$. - This statement is true, indicating its ionic nature in solid form.
 ## LEARNING AIDS
**Common Mistakes**:
 1. Confusing the appearance of $N_2O_5$ with $NO_2$. $NO_2$ is brown, while $N_2O_5$ is colorless.
 2.  Forgetting that non-metal oxides are generally acidic.
**Quick Tips**:
 1. Remember the reaction $N_2O_5 + H_2O ightarrow 2HNO_3$ to associate $N_2O_5$ with nitric acid.
 2. Note the ionic structure of $N_2O_5$ in solid form as $NO_2^+NO_3^-$.

Mr. S M HUSSAIN · Answer

It is an acidic oxide.

Mr. S M HUSSAIN · Answer

The correct Option is "It exists as a brown gas at room temperature."

Mr. S M HUSSAIN · Answer

It forms $HNO_3$ when dissolved in water.

Mr. S M HUSSAIN · Answer

In solid state, it exists as $NO_2^+NO_3^-$.

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