1
WB JEE 2022
MCQ (Single Correct Answer)
+1
-0.25
Change Language

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
$${{0.04} \over {25}}{N_0}$$
2
WB JEE 2021
MCQ (Single Correct Answer)
+2
-0.5
Change Language
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 (Msolute / Msolvent) is
A
9
B
$${1 \over {9}}$$
C
4.5
D
$${1 \over {4.5}}$$
3
WB JEE 2020
MCQ (Single Correct Answer)
+1
-0.25
Change Language
The mole fraction of ethanol in water is 0.08. Its molality is
A
6.32 mol kg-1
B
4.83 mol kg-1
C
3.82 mol kg-1
D
2.84 mol kg-1
4
WB JEE 2020
MCQ (Single Correct Answer)
+1
-0.25
Change Language
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
A
10-2 mol
B
10-4 mol
C
2 $$ \times $$ 10-4 mol
D
10-3 mol
WB JEE Subjects
EXAM MAP
Medical
NEET
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
CBSE
Class 12