Question

nh₃(g) + o₂(g) stackrel{pt}{→} no(g) + h₂o(l)
what element is the catalyst in the reaction above?
○ h
○ n
○ o
○ pt
done

Explanation:

A catalyst is a substance that increases the rate of a chemical reaction without being consumed in the process. In the given reaction, the symbol "Pt" (Platinum) is written above the arrow, which is the standard notation for indicating a catalyst in a chemical equation. Hydrogen (H), Nitrogen (N), and Oxygen (O) are reactants or part of the reactants/products and are consumed or produced in the reaction, not acting as catalysts here.

Answer:

D. Pt