For the chemical reaction N2(g) + 3H2(g) 2NH3(g) the correct option is:

Correct answer: (A) -1/3d[H2]/dt = 1/2d[NH3]/dt. Answer: (A) -1/3d[H2]/dt = 1/2d[NH3]/dt Solution: The rate of reaction is each species term divided by its stoichiometric coefficient: Rate = -d[N2]/dt = -1/3d[H2]/dt = +1/2d[NH3]/dt Comparing the H2 and NH3 terms gives option (A). Option (B) is wrong since -d[N2]/dt = 1/2d[NH3]/dt, not 2d[NH3]/dt; options (C) and (D) use the wrong factors.

NEET 2019 · ChemistryRate lawPrevious Year Question

For the chemical reaction $N X_{2} (g) + 3 H X_{2} (g) 2 NH X_{3} (g)$ the correct option is:

Answer: (A) $- \frac{1}{3} \frac{d [ H X _{2} ]}{d t} = \frac{1}{2} \frac{d [ NH X _{3} ]}{d t}$ . \textbf{Answer:} (A) $- \frac{1}{3} \frac{d [ H X _{2} ]}{d t} = \frac{1}{2} \frac{d [ NH X _{3} ]}{d t}$ \textbf{Solution:} The rate of reaction is each species term divided by its stoichiometric coefficient: $Rate = - \frac{d [ N X _{2} ]}{d t} = - \frac{1}{3} \frac{d [ H X _{2} ]}{d t} = + \frac{1}{2} \frac{d [ NH X _{3} ]}{d t}$ Comparing the $H X_{2}$ and $NH X_{3}$ terms gives option (A).

A. $- \frac{1}{3} \frac{d [ H X _{2} ]}{d t} = \frac{1}{2} \frac{d [ NH X _{3} ]}{d t}$ ✓
B. $- \frac{d [ N X _{2} ]}{d t} = 2 \frac{d [ NH X _{3} ]}{d t}$
C. $- \frac{d [ N X _{2} ]}{d t} = \frac{1}{2} \frac{d [ NH X _{3} ]}{d t}$
D. $- \frac{3}{2} \frac{d [ H X _{2} ]}{d t} = \frac{d [ NH X _{3} ]}{d t}$

Correct Answer

(A) $- \frac{1}{3} \frac{d [ H X _{2} ]}{d t} = \frac{1}{2} \frac{d [ NH X _{3} ]}{d t}$

Solution & Explanation

\textbf{Answer:} (A) $- \frac{1}{3} \frac{d [ H X _{2} ]}{d t} = \frac{1}{2} \frac{d [ NH X _{3} ]}{d t}$ \textbf{Solution:} The rate of reaction is each species term divided by its stoichiometric coefficient: $Rate = - \frac{d [ N X _{2} ]}{d t} = - \frac{1}{3} \frac{d [ H X _{2} ]}{d t} = + \frac{1}{2} \frac{d [ NH X _{3} ]}{d t}$ Comparing the $H X_{2}$ and $NH X_{3}$ terms gives option (A). Option (B) is wrong since $- \frac{d [ N X _{2} ]}{d t} = \frac{1}{2} \frac{d [ NH X _{3} ]}{d t}$ , not $2 \frac{d [ NH X _{3} ]}{d t}$ ; options (C) and (D) use the wrong factors.

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For the chemical reaction NX2​(g)+3HX2​(g)​2NHX3​(g) the correct option is:

Solution & Explanation

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For the chemical reaction $N X_{2} (g) + 3 H X_{2} (g) 2 NH X_{3} (g)$ the correct option is: