WB JEE 2025 | WB JEE Year Wise Previous Years Questions

WB JEE 2025

MCQ (Single Correct Answer)

-0.25

How many oxygen atoms are present in 0.36 g of a drop of water at STP?

$6.023 \times 10^{22}$

$1.205 \times 10^{22}$

$6.023 \times 10^{23}$

$1.205 \times 10^{23}$

WB JEE 2025

MCQ (Single Correct Answer)

-0.25

The molar conductances of $\mathrm{Ba}(\mathrm{OH})_2, \mathrm{BaCl}_2$ and $\mathrm{NH}_4 \mathrm{Cl}$ at infinite dilution are $523 \cdot 28,280 \cdot 0$ and $129.8 \mathrm{~S} \mathrm{~cm}^2 \mathrm{~mol}^{-1}$ respectively. The molar conductance of $\mathrm{NH}_4 \mathrm{OH}$ at infinite dilution will be

$125.72 \mathrm{~S} \mathrm{~cm}^2 \mathrm{~mol}^{-1}$

$251.44 \mathrm{~S} \mathrm{~cm}^2 \mathrm{~mol}^{-1}$

$502.88 \mathrm{~S} \mathrm{~cm}^2 \mathrm{~mol}^{-1}$

$754.32 \mathrm{~S} \mathrm{~cm}^2 \mathrm{~mol}^{-1}$

WB JEE 2025

MCQ (Single Correct Answer)

-0.25

The common stable oxidation states of Eu and Gd are respectively

+3 and +3

+3 and +2

+2 and +3

+2 and +2