1
WB JEE 2025
MCQ (Single Correct Answer)
+1
-0.25

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

A
$6.023 \times 10^{22}$
B
$1.205 \times 10^{22}$
C
$6.023 \times 10^{23}$
D
$1.205 \times 10^{23}$
2
WB JEE 2023
MCQ (Single Correct Answer)
+1
-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$$_2$$

A
IV < III < II < I
B
IV < I < III < II
C
III < II < IV < I
D
I < III < II < IV
3
WB JEE 2023
MCQ (Single Correct Answer)
+2
-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

A
1.25 M
B
1.0 M
C
0.75 M
D
1.1 M
4
WB JEE 2022
MCQ (Single Correct Answer)
+1
-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?

A
1.26 g
B
0.126 g
C
0.63 g
D
0.063 g
WB JEE Subjects