1
JEE Main 2022 (Online) 28th June Evening Shift
Numerical
+4
-1

A radioactive element has a half life of 200 days. The percentage of original activity remaining after 83 days is ___________. (Nearest integer)

(Given : antilog 0.125 = 1.333, antilog 0.693 = 4.93)

2
JEE Main 2022 (Online) 28th June Morning Shift
Numerical
+4
-1

The solubility product of a sparingly soluble salt A2X3 is 1.1 $$\times$$ 10$$-$$23. If specific conductance of the solution is 3 $$\times$$ 10$$-$$5 S m$$-$$1, the limiting molar conductivity of the solution is $$x \,\times$$ 10$$-$$3 S m2 mol$$-$$1. The value of x is ___________.

3
JEE Main 2022 (Online) 28th June Morning Shift
Numerical
+4
-1

For a first order reaction A $$\to$$ B, the rate constant, k = 5.5 $$\times$$ 10$$-$$14 s$$-$$1. The time required for 67% completion of reaction is x $$\times$$ 10$$-$$1 times the half life of reaction. The value of x is _____________ (Nearest integer)

(Given : log 3 = 0.4771)

4
JEE Main 2022 (Online) 27th June Evening Shift
Numerical
+4
-1

pH value of 0.001 M NaOH solution is ____________.

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