1
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
2
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
3
WB JEE 2022
+1
-0.25 A metal (M) forms two oxides. The ratio M:O (by weight) in the two oxides are 25:4 and 25:6. The minimum value of atomic mass of M is

A
50
B
100
C
150
D
200
4
WB JEE 2022
+1
-0.25 1 mL of water has 25 drops. Let N0 be the Avogadro number. What is the number of molecules present in 1 drop of water ? (Density of water = 1 g/mL)

A
$${{0.02} \over 9}{N_0}$$
B
$${{18} \over {25}}{N_0}$$
C
$${{25} \over {18}}{N_0}$$
D
$${{0.04} \over {25}}{N_0}$$
WB JEE Subjects
Physics
Mechanics
Electricity
Optics
Modern Physics
Chemistry
Physical Chemistry
Inorganic Chemistry
Organic Chemistry
Mathematics
Algebra
Trigonometry
Coordinate Geometry
Calculus
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