1
JEE Main 2021 (Online) 20th July Evening Shift
Numerical
+4
-1
$$PC{l_5}(g) \to PC{l_3}(g) + C{l_2}(g)$$

In the above first order reaction the concentration of PCl5 reduces from initial concentration 50 mol L$$-$$1 to 10 mol L$$-$$1 in 120 minutes at 300 K. The rate constant for the reaction at 300 K is x $$\times$$ 10$$-$$2 min$$-$$1. The value of x is __________. [Given log5 = 0.6989]
2
JEE Main 2021 (Online) 20th July Morning Shift
Numerical
+4
-1
The inactivation rate of a viral preparation is proportional to the amount of virus. In the first minute after preparation, 10% of the virus is inactivated. The rate constant for viral inactivation is ___________ $$\times$$ 10$$-$$3 min$$-$$1. (Nearest integer)

[Use : ln 10 = 2.303; log10 3 = 0.477; property
of logarithm : log xy = y log x]
3
JEE Main 2021 (Online) 18th March Evening Shift
Numerical
+4
-1
A reaction has a half life of 1 min. The time required for 99.9% completion of the reaction is _________ min. (Round off to the Nearest Integer). [Use : ln 2 = 0.69; ln 10 = 2.3]
4
JEE Main 2021 (Online) 18th March Morning Shift
Numerical
+4
-1
2NO(g) + Cl2(g) $$\rightleftharpoons$$ 2NOCl(s)

This reaction was studied at $$-$$10$$^\circ$$ and the following data was obtained

Run $${[NO]_0}$$ $${[C{l_2}]_0}$$ $${r_0}$$
1 0.10 0.10 0.18
2 0.10 0.20 0.35
3 0.20 0.20 1.40

$${[NO]_0}$$ and $${[C{l_2}]_0}$$ are the initial concentrations and r0 is the initial reaction rate.

The overall order of the reaction is __________. (Round off to the Nearest Integer).
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