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
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The following reaction was carried out at 300 K.

2SO2(g)  +  O2(g) →  2SO3(g)

The rate of formation of $S{O}_{3}$ is related to the rate of disappearance of ${O}_{2}$  by the following expression:

1. $-\frac{∆\left[{O}_{2}\right]}{∆t}=+\frac{1}{2}\frac{∆\left[S{O}_{3}\right]}{∆t}$

2. $-\frac{∆\left[{O}_{2}\right]}{∆t}=\frac{∆\left[S{O}_{3}\right]}{∆t}$

3. $-\frac{∆\left[{O}_{2}\right]}{∆t}=-\frac{1}{2}\frac{∆\left[S{O}_{3}\right]}{∆t}$

4. None of the above.

Subtopic:  Definition, Rate Constant, Rate Law |
88%
From NCERT
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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
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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%
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A reaction is first-order with respect to A and second-order with respect to B. The concentration of B is increased three times. The new rate of the reaction would:

 1 Decrease 9 times 2 Increase 9 times 3 Increase 6 times 4 Decrease 6 times
Subtopic:  Definition, Rate Constant, Rate Law |
88%
From NCERT
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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
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During the formation of ammonia by Haber's process N+ 3H2 → 2NH3, the rate of appearance of NH3 was measured as 2.5 x 10-4 mol L-1 s-1. The rate of disappearance of H2 will be:

1. 2.5 x 10-4 mol L-1 s-1

2. 1.25 x 10-4 mol L-1 s-1

3. 3.75 x 10-4 mol L-1 s-1

4. 15.00 x 10-4 mol L-1 s-1

Subtopic:  Definition, Rate Constant, Rate Law |
84%
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For the reaction, $$\mathrm{N}_2+3 \mathrm{H}_2 \rightarrow 2 \mathrm{NH}_3,$$ if, $$\frac{d[NH_{3}]}{dt} \ = \ 2\times 10^{-4} \ mol \ L^{-1} \ s^{-1}$$, the value of  $$\frac{-d[H_{2}]}{dt}$$ would be:

 1 $$3 \times 10^{-4} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}$$ 2 $$4 \times 10^{-4} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}$$ 3 $$6 \times 10^{-4} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}$$ 4 $$1 \times 10^{-4} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}$$
Subtopic:  Definition, Rate Constant, Rate Law |
84%
From NCERT
AIPMT - 2009
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The rate constant of a particular reaction has the dimension of frequency. The order of the reaction is:

1. Zero.

2. First.

3. Second.

4. Fractional.

Subtopic:  Definition, Rate Constant, Rate Law |
80%
From NCERT
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The incorrect statement regarding the order of reaction is:

 1 Order is not influenced by the stoichiometric coefficient of the reactants. 2 Order of reaction is the sum of power to the concentration terms of reactants to express the rate of reaction. 3 The order of reaction is always a whole number. 4 Order can be determined by experiments only.
Subtopic:  Definition, Rate Constant, Rate Law |
79%
From NCERT
AIPMT - 2011
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