WB JEE 2022 | Some Basic Concepts of Chemistry Question 6 | Chemistry

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

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

WB JEE 2020

MCQ (Single Correct Answer)

-0.25

The mole fraction of ethanol in water is 0.08. Its molality is

6.32 mol kg^-1

4.83 mol kg^-1

3.82 mol kg^-1

2.84 mol kg^-1

WB JEE 2020

MCQ (Single Correct Answer)

-0.25

5 mL of 0.1 M Pb(NO₃)₂ is mixed with 10 mL of 0.02 M KI. The amount of PbI₂ precipitated will be about

10^-2 mol

10^-4 mol

2 $$ \times $$ 10^-4 mol

10^-3 mol

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