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Chemistry
List of top Chemistry Questions
Chlorophyll, the green colouring matter of plants responsible for photosynthesis contains 2.68 % of magnesium by mass. The number of magnesium atoms in 2.00 g of chlorophyll are
Chemistry
Some basic concepts of chemistry
Consider the following reaction
$Zn + 2HCl \to ZnCl_2 + H_2$
If
$0.3$
mol of
$Zn$
reacts with
$0.52$
mol of
$HCl$
, then which is incorrect regarding above reaction?
Chemistry
Some basic concepts of chemistry
Cortisone is a molecular substance containing 21 atoms of carbon per molecule. The mass percentage of carbon in cortisone is 69.98 %. What is the molar mass of cortisone ?
Chemistry
Some basic concepts of chemistry
Four containers of 2L capacity contains dinitrogen as described below. Which one contains maximum number of molecules ?
Chemistry
Some basic concepts of chemistry
How many atoms are contained in one mole of sucrose
$(C_{12}H_{22}O_{11})$
?
Chemistry
Some basic concepts of chemistry
How many grams of
$CaO$
are required to react with
$852 \,g$
of
$P_{4}O_{10}$
?
Chemistry
Some basic concepts of chemistry
How many moles of magnesium phosphate
$Mg_3(PO_4)_2$
will contains
$0.25$
mole of oxygen atoms:
Chemistry
Some basic concepts of chemistry
How many seconds are there in
$3$
days?
Chemistry
Some basic concepts of chemistry
How much does mass of
$NH_3$
contain same number of atoms as in
$4\, g$
atom of oxygen?
Chemistry
Some basic concepts of chemistry
How much mass of silver nitrate will react with
$5.85\, g$
of sodium chloride to produce
$14.35 \,g$
of silver chloride and
$8.5\, g$
of sodium nitrate if law of conservation of mass is followed?
Chemistry
Some basic concepts of chemistry
Hydrogen and oxygen combine to form
$H_2O_2$
and
$H_2O$
containing 5.93% and 11.2% hydrogen respectively. The data illustrates
Chemistry
Some basic concepts of chemistry
Hydrogen gas is prepared in the laboratory by reacting dilute
$HCl$
with granulated zinc. Following reaction takes place :
$Zn+2HCl \to Zn Cl_{2} +H_{2}$
What would be the volume of hydrogen gas liberated at
$STP$
when
$32.65 \,g$
of zinc reacts with
$HCl$
?
Chemistry
Some basic concepts of chemistry
If 20 g of
$CaCO_3$
is treated with 100 mL of 20% HCl solution, the amount of
$CO_2$
produced is
Chemistry
Some basic concepts of chemistry
If 224 mL of a triatomic gas has a mass of 1 g at 273 K and 1 atm. pressure, then the mass of one atom is
Chemistry
Some basic concepts of chemistry
If 30 mL of
$H_2$
and 20 mL of
$O_2$
reacts to form water, what is left at the end of the reaction ?
Chemistry
Some basic concepts of chemistry
If
$40 \,g$
of
$CaCO_{3}$
is treated with
$40\, g$
of
$HCl$
, which of the reactants will act as limiting reagent?
Chemistry
Some basic concepts of chemistry
If 6.3 g of
$NaHCO_3$
are added to 15.0 g of
$CH_3COOH$
solution ,the residue is found to weigh 18.0 g. The mass of
$CO_2$
released in the reactionis
Chemistry
Some basic concepts of chemistry
If isotopic distribution of C-12 and C-14 is 98% and 2% respectively, then the number of C-14 atoms in 12 g of carbon is
Chemistry
Some basic concepts of chemistry
If law of conservation of mass was to hold true, then 20.8 g of
$BaCl_2$
on reaction with 9 8 g of
$H_2S0_4$
will produce 7.3 g of HCl and
$BaS0_4$
equal to
Chemistry
Some basic concepts of chemistry
If LPG cylinder contains mixture of butane and isobutane,then the amount of oxygen that would be required for combustion of 1 kg of it will be
Chemistry
Some basic concepts of chemistry
If
$N_A$
is Avogadro's number then number of valence electrons in 4.2 g of nitride ions
$N^{3-}$
is
Chemistry
Some basic concepts of chemistry
If
$N_A$
is Avogadro's number, then the number of oxygen atom in one g-equivalent of oxygen is
Chemistry
Some basic concepts of chemistry
If one million atoms of silver weigh
$1.79 \times 10^{-16}g$
, the gram atomic weight of silver is
Chemistry
Some basic concepts of chemistry
If potassium chlorate is 80% pure, then 48 g of oxygen would be produced from (atomic mass of K= 39) ;
Chemistry
Some basic concepts of chemistry
If the atomic mass of carbon was set at 100 u, what would be the value of Avogadro's number ?
Chemistry
Some basic concepts of chemistry
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