1
WB JEE 2021
+1
-0.25
2.5 mL 0.4 M weak monoacidic base (Kb = 1 $$\times$$ 10$$-$$12 at 25$$^\circ$$C) is titrated with 2/15 M HCl in water at 25$$^\circ$$C. The concentration of H+ at equivalence point is (Kw = 1 $$\times$$ 10$$-$$14, at 25$$^\circ$$C)
A
3.7 $$\times$$ 10$$-$$13 M
B
3.2 $$\times$$ 10$$-$$7 M
C
3.2 $$\times$$ 10$$-$$2 M
D
2.7 $$\times$$ 10$$-$$2 M
2
WB JEE 2020
+2
-0.5
For a reaction 2A + B $$\to$$ P, when concentration of B alone is doubled, t1/2 does not change and when concentrations of both A and B is doubled, rate increases by a factor of 4. The unit of rate constant is,
A
s-1
B
L mol-1s-1
C
mol L-1s-1
D
L2mol-2s-1
3
WB JEE 2019
+1
-0.33
Consider the following two first order reactions occurring at 298 K with same initial concentration of A :

(1) A $$\to$$ B; rate constant, k = 0.693 min$$-$$1

(2) A $$\to$$ C; half-life, t1/2 = 0.693 min

Choose the correct option.
A
Reaction (1) is faster than reaction (2)
B
Reaction (1) is slower than reaction (2)
C
Both reactions proceed at the same rate.
D
Since two different products are formed, rates cannot be compared.
4
WB JEE 2019
+2
-0.67
The kinetic study of a reaction like vA $$\to$$ P at 300 K provides the following curve, where concentration is taken in mol dm$$-$$3 and time in min.

Identify the correct order (n) and rate constant (k)
A
n = 0, k = 4.0 mol dm$$-$$3 min$$-$$1
B
n = 1/2, k = 2.0 mol dm$$-$$3/2 min$$-$$1
C
n = 1, k = 8.0 min$$-$$1
D
n = 2, k = 16.0 dm3 mol$$-$$1min$$-$$1
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Physics
Mechanics
Electricity
Optics
Modern Physics
Chemistry
Physical Chemistry
Inorganic Chemistry
Organic Chemistry
Mathematics
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Calculus
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