WB JEE 2023 | Periodic Table Question 1 | Chemistry

WB JEE 2023

MCQ (Single Correct Answer)

-0.25

4f$$^2$$ electronic configuration is found in

Pr$$^{3+}$$

Nd$$^{3+}$$

Pm$$^{3+}$$

WB JEE 2023

MCQ (Single Correct Answer)

-0.25

Suppose a gaseous mixture of He, Ne, Ar and Kr is treated with photons of the frequency appropriate to ionize Ar. What ion(s) will be present in the mixture?

Ar$$^+$$

Ar$$^+$$ + Kr$$^+$$

Ar$$^+$$ + He$$^+$$ + Ne$$^+$$

He$$^+$$ + Ar$$^+$$ + Kr$$^+$$

WB JEE 2022

MCQ (Single Correct Answer)

-0.5

The correct pair of electron affinity order is

O > S, F > Cl

O < S, Cl > F

S > O, F > Cl

S < O, Cl > F

WB JEE 2021

MCQ (Single Correct Answer)

-0.5

5.75 mg of sodium vapour is converted to sodium ion. If the ionisation energy of sodium is 490 kJ mol^$$-$$1 and atomic weight is 23 units, the amount of energy needed for this conversion will be

1.96 kJ

1960 kJ

122.5 kJ

0.1225 kJ

WB JEE Subjects