WB JEE 2025 | Some Basic Concepts of Chemistry Question 1 | Chemistry

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 2023

MCQ (Single Correct Answer)

-0.25

Arrange the following in order of increasing mass

I. 1 mole of N$$_2$$

II. 0.5 mole of O$$_3$$

III. $$3.011\times10^{23}$$ molecules of O$$_2$$

IV. 0.5 gram atom of O$$_2$$

IV < III < II < I

IV < I < III < II

III < II < IV < I

I < III < II < IV

WB JEE 2023

MCQ (Single Correct Answer)

-0.5

63 g of a compound (Mol. Wt. = 126) was dissolved in 500 g distilled water. The density of the resultant solution as 1.126 g/ml. The molarity of the solution is

1.25 M

1.0 M

0.75 M

1.1 M

WB JEE 2022

MCQ (Single Correct Answer)

-0.25

How much solid oxalic acid (Molecular weight 126) has to be weighed to prepare 100 ml. exactly 0.1 (N) oxalic acid solution in water?

1.26 g

0.126 g

0.63 g

0.063 g

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