Empirical and molecular formulae - Free MCQ Practice Test with solutions,
MCQ Practice Test & Solutions: Test: Empirical and molecular formulae (15 Questions)
You can prepare effectively for JEE Chemistry for JEE Main & Advanced with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Test: Empirical and molecular formulae". These 15 questions have been designed by the experts with the latest curriculum of JEE 2026, to help you master the concept.
Test Highlights:
- - Format: Multiple Choice Questions (MCQ)
- - Duration: 20 minutes
- - Number of Questions: 15
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A sample of AlF3 contains 3.0 × 1024 F− ions. The number of formula unit of this sample are
Detailed Solution: Question 1
the number of 
is 3 for one 
molecule 
formula unit of 
unitsCalculate the density of an aqueous solution of KI, if its molarity and molality are 
and 
respectively.
and respectively.Detailed Solution: Question 2
What amount of conc. H2SO4 solution should be used to prepare 500 mL of 0.5MH2SO4? (The concentration of H2SO4 solution being used is 90% and molecular mass of H2SO4 = 98.079 g mol−1)
Detailed Solution: Question 3
How many of 
are required to react completely with 
mixture of 
and 
containing equimolar amounts of two?
are required to react completely with mixture of and containing equimolar amounts of two?Detailed Solution: Question 4
of 
is mixed with 
of 
N NaOH solution. The resulting solution is
of is mixed with of N NaOH solution. The resulting solution isDetailed Solution: Question 5
What is the molarity of 
ion in aqueous solution that contain 
of 
(Assume complete dissociation and density of solution 1 g/mL)
ion in aqueous solution that contain of (Assume complete dissociation and density of solution 1 g/mL)
Detailed Solution: Question 6
of a sodium carbonate solution contains 
of 
. If 
of this solution is diluted to one litre, what is the concentration of the resultant solution? (mol. wt. of 
)
of a sodium carbonate solution contains of . If of this solution is diluted to one litre, what is the concentration of the resultant solution? (mol. wt. of )Detailed Solution: Question 7
A carbon compound contains 
of carbon, 
of hydrogen and 
of bromine. The molecular weight of the compound is 187.9. Calculate the molecular formula of the compound.
(Atomic weight: H = 1.008,C = 12.0, Br = 79.9)
of carbon, of hydrogen and of bromine. The molecular weight of the compound is 187.9. Calculate the molecular formula of the compound.(Atomic weight: H = 1.008,C = 12.0, Br = 79.9)
Detailed Solution: Question 8
solution isDetailed Solution: Question 9
solution 
0.5 g of fuming 
(Oleum) is diluted with water. This solution is completely neutralized by 26.7 mL of 0.4 N NaOH. The percentage of free 
in the sample is
(Oleum) is diluted with water. This solution is completely neutralized by 26.7 mL of 0.4 N NaOH. The percentage of free in the sample isDetailed Solution: Question 10
of 
of 
of NaOH
.To 
of 
solution 
of water is added. What is the molarity of resultant solution?
of solution of water is added. What is the molarity of resultant solution?Detailed Solution: Question 11
To find
for 
total positive charge in 
)
(normality) 
(where, 
is molarity).
RH 2 (ion exchange resin) can replace Ca 2 + ions in hard water as:
RH 2 + Ca 2 + → RCa + 2H+
If 1 L of hard water after passing through RH 2 has pH = 3, then hardness in parts per million of Ca 2 + is :
RH 2 + Ca 2 + → RCa + 2H+
If 1 L of hard water after passing through RH 2 has pH = 3, then hardness in parts per million of Ca 2 + is :
Detailed Solution: Question 12
10 - 4 moles per litre
10 - 1 moles of Ca 2 + per 10 3 L
10 - 1 
40 g Ca 2 + per 10 6 g of H 2 OIf the density of 
is 
, the volume of methanol to prepare 
of 
aqueous solution is
is , the volume of methanol to prepare of aqueous solution isDetailed Solution: Question 13
, we have Amount of 
required, 
required, 
required, 
The volume ratio of 6N and 2N HCl required to prepare 100 mL of 5N HCl is
Detailed Solution: Question 14
of 
and 
of 
are mixed
The concentration of ethanol in the solution called 86-proof vodka is 
. If the density of the solution is 
, the amount fraction of ethanol in vodka is
. If the density of the solution is , the amount fraction of ethanol in vodka isDetailed Solution: Question 15
of vodka, we have 
and 
Mass of solution, 
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