Test: Laws of chemical combination - JEE MCQ
15 Questions MCQ Test Chemistry for JEE Main & Advanced - Test: Laws of chemical combination
The percentage of Se in peroxidase anhydrous enzyme is 0.5% by weight (atomic weight =78.4). Then minimum molecular weight of peroxidase anhydrous enzyme is
by weight means if Mol. wt. is 100 then mass of Se is 
. If at least one atom of Se is present in the molecule then
The number of water molecules present in a drop of water (volume 0.0018 mL) density = 1g mL−1 at room temperature is
mass 
density 
volume
(Given)
Mass of 
water 
of water 
molecules
Number of molecules of water in 
mole 
) at room temperature are 
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A mixture of 
and gas "Y" mol. mass 80 in the mole ratio a 
has a mean molecular mass 40. What would be mean molecular mass, if the gases are mixed in the ratio 
a under, identical conditions? (Assume that gases are non-reacting):
and gas "Y" mol. mass 80 in the mole ratio a has a mean molecular mass 40. What would be mean molecular mass, if the gases are mixed in the ratio a under, identical conditions? (Assume that gases are non-reacting):
is 
If 
molecules are removed from 
of 
, then the number of moles of 
left are
in 
of 
removes 
left 
Arrange the following in the order of increasing mass (atomic mass: O = 16, Cu = 63, N = 14)
I. one atom of oxygen
II. one atom of nitrogen
III. 
mole of oxygen
IV. 
mole of copper
atoms of oxygen 
Mass of one atom of oxygen
atoms of nitrogen 
Mass of 
mole of oxygen 
Mass of 1 mole of copper 
Mass of 
mole of copper 
Complete combustion of 
of compound 
gives 
of 
and 
of 
. The lowest molecular mass 
can have:
mass of 
Moles of 
mass of 
Lowest M.M. 
When burnt in air, 14.0 g mixture of carbon and sulphur gives a mixture of CO2 and SO2 in the volume ratio of 2:1, volume being measured at the same conditions of temperature and pressure moles of carbon in the mixture is
be 
, then 
will be 
1.12 mL of a gas is produced at S.T.P. by the action of 4.12mg of alcohol ROH with methyl magnesium Iodide. The molecular mass of alcohol is
1 mole of mixture of CO and CO2 requires exactly 28 gKOH in solution for complete conversion of all the CO2 into K2CO3. How much amount more of KOH will be required for conversion into K2CO3 if one mole of mixture is completely oxidized to CO2.
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)
Mass of 
Number of 
Molecule 
A 25.0 mm×40.0 mm piece of gold foil is 0.25 mm thick. The density of gold is 19.32 g/cm3. How many gold atoms are in the sheet? (Atomic weight : Au = 197.0)
of 
and 
of 
are made to react completely to yield a mixture of 
and 
Calculate moles of ICl and 
formed
of water
of 
of 
of 
of water has largest number of molecules.
of oxygen contains number of atoms equal to that in
of sulphur also contains atom = 0.125 NA
, in place of 
, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of the substance will
times the old amu - hence, 
', but hold on, the mass of 1 mole of carbon will be the mass of carbon in amu'* mass of amu'* avagadro number 
(mass of amu in 
the old mass itself!|
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