1
JEE Main 2021 (Online) 25th February Evening Shift
Numerical
+4
-1
The spin only magnetic moment of a divalent ion in aqueous solution (atomic number 29) is _________ BM.
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2
JEE Main 2021 (Online) 25th February Evening Shift
Numerical
+4
-1
If a compound AB dissociates to the extent of 75% in an aqueous solution, the molality of the solution which shows a 2.5 K rise in the boiling point of the solution is ____________ molal. (Rounded off to the nearest integer)

[Kb = 0.52 K kg mol$$-$$1]
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3
JEE Main 2021 (Online) 25th February Evening Shift
Numerical
+4
-1
Electromagnetic radiation of wavelength 663 nm is just sufficient to ionise the atom of metal A. The ionization enegy of metal A in kJ mol$$-$$1 is __________. (Rounded off to the nearest integer)

[h = 6.63 $$\times$$ 10$$-$$34 Js, c = 3.00 $$\times$$ 108 ms$$-$$1, NA = 6.02 $$\times$$ 1023 mol$$-$$1]
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4
JEE Main 2021 (Online) 25th February Evening Shift
Numerical
+4
-1
Consider titration of NaOH solution versus 1.25 M oxalic acid solution. At the end point following burette readings were obtained.

(i) 4.5 mL

(ii) 4.5 mL

(iii) 4.4 mL

(iv) 4.4 mL

(v) 4.4 mL

If the volume of oxalic acid taken was 10.0 mL then the molarity of the NaOH solution is ________ M. (Rounded off to the nearest integer)
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