1
WB JEE 2021
MCQ (Single Correct Answer)
+1
-0.25
Change Language
The equilibrium constant for the reaction

N2(g) + O2(g) $$\rightleftharpoons$$ 2NO(g) is 4 $$\times$$ 10$$-$$4 at 2000 K. In presence of a catalyst the equilibrium is attained 10 times faster. Therefore, the equilibrium constant, in presence of the catalyst at 2000 K is
A
4 $$\times$$ 10$$-$$4
B
4 $$\times$$ 10$$-$$3
C
4 $$\times$$ 10$$-$$5
D
2.5 $$\times$$ 10$$-$$4
2
WB JEE 2021
MCQ (Single Correct Answer)
+1
-0.25
Change Language
Under the same reaction conditions, initial concentration of 1.386 mol dm$$-$$3 of a substance becomes half in 40 s and 20 s through first-order and zero-order kinetics respectively. Ratio $$\left( {{{{k_1}} \over {{k_0}}}} \right)$$ of the rate constants for first-order (k1) and zero-order (k0) of the reactions is
A
0.5 mol$$-$$1 dm3
B
0.5 mol dm$$-$$3
C
1.0 mol dm3
D
2.0 mol$$-$$1 dm3
3
WB JEE 2021
MCQ (Single Correct Answer)
+1
-0.25
Change Language
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
4
WB JEE 2020
MCQ (Single Correct Answer)
+2
-0.5
Change Language
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
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