1
WB JEE 2023
+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
2
WB JEE 2023
+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
3
WB JEE 2022
+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
4
WB JEE 2022
+1
-0.25 $${C_6}{H_6}(liq) + {{15} \over 2}{O_2}(g) \to 6C{O_2}(g) + 3{H_2}O(liq)$$

Benzene burns in oxygen according to the above equation. What is the volume of oxygen (at STP) needed for complete combustion of 39 gram of liquid benzene?

A
11.2 litre
B
22.4 litre
C
84 litre
D
168 litre
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