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Chemistry
List of top Chemistry Questions
Molarity of a solution does not depend upon temperature whereas molality depends. Molarity and molality both depend only on the number of moles of solute particles
Chemistry
Some basic concepts of chemistry
The reactant which is present in larger amount limits the amount of product formed is called limiting reagent Amount of product formed does not depend upon the amount of reactants taken
Chemistry
Some basic concepts of chemistry
At
$NTP$
,
$1\, L$
of
$O_{2}$
reacts with
$3 \,L$
of carbon monoxide. What will be the volume of
$CO$
and
$CO_{2}$
after the reaction?
Chemistry
Some basic concepts of chemistry
Atomic weights of two elements
$P$
and
$Q$
are
$60$
and
$120$
respectively, If
$'x'$
gram of
$P$
contains
$y$
atoms, the number of atoms present in
$2x$
grams of
$Q$
is
Chemistry
Some basic concepts of chemistry
Average atomic mass of magnesium is
$24.31$
a.m.u. This magnesium is composed of
$79$
mole
$%$
of
$^{24}Mg$
and remaining
$21$
mole
$%$
of
$^{24}Mg$
and
$^{26}Mg$
. Calculate mole
$%$
of
$^{26}Mg$
.
Chemistry
Some basic concepts of chemistry
Avogadro's number is the number of molecules present in :
Chemistry
Some basic concepts of chemistry
Calcium carbonate decomposes on heating to give calcium oxide and carbon dioxide. How much volume of
$CO_2$
will be obtained by thermal decomposition of
$50\, g$
of
$CaCO_3$
?
Chemistry
Some basic concepts of chemistry
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
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