Question:
Consider the following statements concerning $N_2H_4$
1. It is an exothermic compound
2. It burns in air with the evolution of heat
3. It has kinetic stability
4. It reduces $Fe^{3+}$ to $Fe^{2+}$ in acidic medium
Which of the following combination is correct?
Consider the following statements concerning $N_2H_4$
1. It is an exothermic compound
2. It burns in air with the evolution of heat
3. It has kinetic stability
4. It reduces $Fe^{3+}$ to $Fe^{2+}$ in acidic medium
Which of the following combination is correct?
1. It is an exothermic compound
2. It burns in air with the evolution of heat
3. It has kinetic stability
4. It reduces $Fe^{3+}$ to $Fe^{2+}$ in acidic medium
Which of the following combination is correct?
Show Hint
Hydrazine's endothermic nature and high heat of combustion are why it is used as a high-performance rocket fuel.
Updated On: Apr 29, 2026
- 2 and 3 are correct
- 1 and 2 are correct
- All are correct
- 3 and 4 are correct
- 2, 3 and 4 are correct
Show Solution
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The Correct Option is
Solution and Explanation
Concept:
Hydrazine (\(N_2H_4\)) is a powerful reducing agent and a high-energy compound.
Step 1: Evaluate Statement 1 and 2.
Hydrazine is actually an endothermic compound (\(\Delta H_f > 0\)), meaning it requires energy to form. However, it burns very easily in oxygen to release a massive amount of heat: \[ N_2H_4 + O_2 \rightarrow N_2 + 2H_2O + \text{Heat} \] Thus, 1 is False, 2 is True.
Step 2: Evaluate Statement 3.
Despite being thermodynamically unstable (endothermic), it does not decompose instantly at room temperature. This is known as kinetic stability. (3 is True).
Step 3: Evaluate Statement 4.
Hydrazine is a strong reducing agent. It readily reduces metal ions to lower oxidation states: \[ N_2H_4 + 4Fe^{3+} \rightarrow N_2 + 4H^+ + 4Fe^{2+} \] (4 is True).
Step 1: Evaluate Statement 1 and 2.
Hydrazine is actually an endothermic compound (\(\Delta H_f > 0\)), meaning it requires energy to form. However, it burns very easily in oxygen to release a massive amount of heat: \[ N_2H_4 + O_2 \rightarrow N_2 + 2H_2O + \text{Heat} \] Thus, 1 is False, 2 is True.
Step 2: Evaluate Statement 3.
Despite being thermodynamically unstable (endothermic), it does not decompose instantly at room temperature. This is known as kinetic stability. (3 is True).
Step 3: Evaluate Statement 4.
Hydrazine is a strong reducing agent. It readily reduces metal ions to lower oxidation states: \[ N_2H_4 + 4Fe^{3+} \rightarrow N_2 + 4H^+ + 4Fe^{2+} \] (4 is True).
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