Reaction of hydrazine with chlorate ions

N2H4(g) + ClO3-(aq) → NO(g) + Cl-(aq)

Balanced:
3N2H4(g) + 4ClO3-(aq) → 6NO(g) + 6H2O(l) + 4Cl-(aq)

Reducing agent: ClO3-
Oxidizing agent: N2H4

Right?

The equation is balanced.

You have reversed the reducing and oxidizing agents.
Oxidation is loss of e. Cl goes from +5 to -1 and that gains electrons. It must be reduced which makes it the oxidizing agent.
N goes from -4 to +4 which is loss of e which makes it oxidized and means it is the reducing agent.

Actually I think the oxidation state of N becomes +2, not +4

Yes, that's correct. In the reaction between hydrazine (N2H4) and chlorate ions (ClO3-), hydrazine serves as the reducing agent while chlorate ions act as the oxidizing agent. The balanced equation you provided correctly represents the reaction, showing the reduction of chlorate ions to chloride ions (Cl-) and the oxidation of hydrazine to nitric oxide (NO).

Yes, your statement is correct. In the balanced chemical equation for the reaction between hydrazine (N2H4) and chlorate ions (ClO3-), hydrazine is the reducing agent, and chlorate ions are the oxidizing agent.

To determine the reducing agent and oxidizing agent in a chemical reaction, you need to consider the change in oxidation states of the elements involved.

In this reaction, hydrazine (N2H4) undergoes oxidation, and its nitrogen atoms change from an oxidation state of -2 to 0 in nitrogen monoxide (NO). Since the oxidation state of nitrogen is increasing, hydrazine acts as the reducing agent.

On the other hand, chlorate ions (ClO3-) undergo reduction, and the chlorine atoms change from an oxidation state of +5 to -1 in chloride ions (Cl-). Since the oxidation state of chlorine is decreasing, chlorate ions act as the oxidizing agent.

It is always important to balance the chemical equation to ensure that the number of atoms of each element is the same on both sides. In the balanced equation, 3 moles of hydrazine react with 4 moles of chlorate ions to produce 6 moles of nitrogen monoxide, 6 moles of water, and 4 moles of chloride ions.