For the reaction, $$2 A+B \rightarrow 3 C+D$$

An incorrect expression for the rate of reaction is:

 1 $$-\frac{d[C]}{3} d t$$ 2 $$-\frac{d[B]}{d t}$$ 3 $$\frac{d[D]}{d t}$$ 4 $$-\frac{d[A]}{2 d t}$$
Subtopic:  Definition, Rate Constant, Rate Law |
90%
From NCERT
AIPMT - 2006
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

For a general reaction A $\to$ B, the plot of the concentration of A vs. time is given in the figure.

The slope of the curve will be:

 1 -k 2 -k/2 3 -k2 4 -k/3
Subtopic:  Definition, Rate Constant, Rate Law |
89%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The correct expression for the rate of reaction given below is:
$$5 \mathrm{Br}^{-}(\mathrm{aq})+\mathrm{BrO}_3^{-}(\mathrm{aq})+6 \mathrm{H}^{+}(\mathrm{aq}) \rightarrow 3 \mathrm{Br}_2(\mathrm{aq})+3 \mathrm{H}_2 \mathrm{O}(\mathrm{l})$$

 1 $$\frac{\Delta\left[B r^{-}\right]}{\Delta t}=5 \frac{\Delta\left[H^{+}\right]}{\Delta t}$$ 2 $$\frac{\Delta\left[\mathrm{Br}^{-}\right]}{\Delta t}=\frac{6}{5} \frac{\Delta\left[\mathrm{H}^{+}\right]}{\Delta t}$$ 3 $$\frac{\Delta[\mathrm{Br^-}]}{\Delta t}=\frac{5}{6} \frac{\Delta\left[\mathrm{H}^{+}\right]}{\Delta t}$$ 4 $$\frac{\Delta\left[\mathrm{Br}^{-}\right]}{\Delta t}=6 \frac{\Delta\left[\mathrm{H}^{+}\right]}{\Delta t}$$
Subtopic:  Definition, Rate Constant, Rate Law |
88%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

For the reaction,

N2O5(g) → 2NO2(g) + $$\frac{1}{2}$$O2(g)

the value of the rate of disappearance of ${\mathrm{N}}_{2}{\mathrm{O}}_{5}$ is given as  $mol$ ${L}^{-1}{s}^{-1}$. The rate of formation of $N{O}_{2}$ $and$ ${O}_{2}$ is given respectively as:

1. 6.25 x 10-3 mol L-1s-1 and 6.25 x 10-3 mol L-1s-1

2. 1.25 x 10-2 mol L-1s-1 and 3.125 x 10-3 mol L-1s-1${}^{}$

3. 6.25 x 10-3 mol L-1s-1 and 3.125 x 10-3 mol L-1s-1

4. 1.25 x 10-2 mol L-1s-1 and 6.25 x 10-3 mol L-1s-1

Subtopic:  Definition, Rate Constant, Rate Law |
86%
From NCERT
NEET - 2010
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The decomposition of NH3 on a platinum surface is a zero-order reaction. The rates of production of N2 and H2
will be respectively:
(given ; k = 2.5 × 10–4 mol–1 L s–1 )

 1 2.5 x 10-4 mol L-1 s-1 and 5.5 x 10-4 mol L-1 s-1 2 2.5 x 10-4 mol L-1 s-1 and 7.5 x 10-4 mol L-1 s-1 3 1.5 x 10-4 mol L-1 s-1 and 4.5 x 10-4 mol L-1 s-1 4 0.5 x 10-4 mol L-1 s-1 and 3.5 x 10-4 mol L-1 s-1

Subtopic:  Definition, Rate Constant, Rate Law |
79%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

For a reaction, 2A + B C + D, the following observations were recorded:

 Experiment [A]/mol L-1 [B]/mol L-1 Initial rate of formation of D/mol L-1 min-1 I 0.1 0.1 6.0 x 10-3 II 0.3 0.2 7.2 x 10-2 III 0.3 0.4 2.88 x 10-1 IV 0.4 0.1 2.40 x 10-2

The rate law applicable to the above mentioned reaction would be:

1. Rate = k[A]2[B]3

2. Rate = k[A][B]2

3. Rate = k[A]2[B]

4. Rate = k[A][B]

Subtopic:  Definition, Rate Constant, Rate Law |
80%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The rate equation of a reaction is expressed as, Rate = $$k(P_{CH_{3}OCH_{3}})^{\frac{3}{2}}$$

(Unit of rate = bar min-1)

The units of the rate constant will be:

1. bar1/2 min
2. bar2 min-1
3. bar-1min-2
4. bar-1/2min-1

Subtopic:  Definition, Rate Constant, Rate Law |
77%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

True statement among the following is:

 1 The rate of a reaction decreases with the passage of time as the concentration of reactants decreases. 2 The rate of a reaction is the same at any time during the reaction. 3 The rate of a reaction is independent of temperature change. 4 The rate of a reaction decreases with an increase in the concentration of the reactants.
Subtopic:  Definition, Rate Constant, Rate Law |
70%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The average rate of reaction between the time interval of 30 to 60 seconds in the below mentioned pseudo 1st order reaction is:
 t/s 0 30 60 90 [Ester]/mol L-1 0.55 0.31 0.17 0.085

$1.$ $6.67$ $×{10}^{-2}$ $\mathrm{mol}$ ${\mathrm{L}}^{-1}$ ${\mathrm{s}}^{-1}$
$2.$ $2.67$ $×$ ${10}^{-4}$ $\mathrm{mol}$ ${\mathrm{L}}^{-1}$ ${\mathrm{s}}^{-1}$ 
$3.$ $4.67$ $×$ ${10}^{-3}$ $\mathrm{mol}$ ${\mathrm{L}}^{-1}$ ${\mathrm{s}}^{-1}$
$4.$ $4.27$ $×$ ${10}^{3}$ $\mathrm{mol}$ ${\mathrm{L}}^{-1}$ ${\mathrm{s}}^{-1}$

Subtopic:  Definition, Rate Constant, Rate Law |
70%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

If at a given instant, for the reaction 2N2O→ 4NO2 + O2 rate and rate constant are 1.02 × 10-4  and 3.4 × 10-5 sec -1 respectively, then the concentration of ${\mathrm{N}}_{2}{\mathrm{O}}_{5}$ at that time will be:

1. 1.732

2. 3.0

3. $1.02$ $×$ ${10}^{-4}$

4. $3.4$ $×$ ${10}^{5}$

Subtopic:  Definition, Rate Constant, Rate Law |
65%
From NCERT
AIPMT - 2001
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints