WB JEE 2022 | Some Basic Concepts of Chemistry Question 5 | Chemistry

WB JEE 2022

MCQ (Single Correct Answer)

-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?

11.2 litre

22.4 litre

84 litre

168 litre

WB JEE 2022

MCQ (Single Correct Answer)

-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

100

150

200

WB JEE 2022

MCQ (Single Correct Answer)

-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)

$${{0.02} \over 9}{N_0}$$

$${{18} \over {25}}{N_0}$$

$${{25} \over {18}}{N_0}$$

$${{0.04} \over {25}}{N_0}$$

WB JEE 2021

MCQ (Single Correct Answer)

-0.5

The mole fraction of a solute in a binary solution is 0.1 at 298 K, molarity of this solution is same as its molality. Density of this solution at 298 K is 2.0 g cm^$$-$$3. The ratio of molecular weights of the solute and the solvent (M_solute / M_solvent) is

$${1 \over {9}}$$

4.5

$${1 \over {4.5}}$$

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