Test: Empirical and molecular formulae - JEE MCQ
15 Questions MCQ Test Chemistry for JEE Main & Advanced - Test: Empirical and molecular formulae
A sample of AlF3 contains 3.0 × 1024 F− ions. The number of formula unit of this sample are
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.
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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)
How many of 
are required to react completely with 
mixture of 
and 
containing equimolar amounts of two?
of 
is mixed with 
of 
N NaOH solution. The resulting solution is
What is the molarity of 
ion in aqueous solution that contain 
of 
(Assume complete dissociation and density of solution 1 g/mL)
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 
)
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)
solution is
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
of 
of 
of NaOH
.To 
of 
solution 
of water is added. What is the molarity of resultant solution?
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 :
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
, we have Amount of 
required, 
required, 
required, 
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
of vodka, we have 
and 
Mass of solution, 
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