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Chemistry
List of top Chemistry Questions
A sample of
$AlF_3$
contains
$3.0 \times 10^{24} F^-$
ions.The number of formula units of this sample are
Chemistry
Some basic concepts of chemistry
A sample of ammonium phosphate,
$(NH_4)3PO_4$
, contains 3.18 moles of hydrogen atoms. The number of moles of oxygen atoms in the sample is
Chemistry
Some basic concepts of chemistry
A sample of copper sulphate pentahydrate,
$CuSO_4.5H_2O$
contains 3.782 g of Cu. How many grams of oxygen are in this sample ?
Chemistry
Some basic concepts of chemistry
A solution containing 0.1 mol of a metal chloride
$MCl_x$
requires 500 mol. of 0.8 M
$AgNO_3$
solution for complete precipitation
$MCl_x+xAgNO_3 \to xAgCl+M(NO_3)_x$
. The value of x is
Chemistry
Some basic concepts of chemistry
A wedding ring presented to a bride contains
$788\, mg$
of gold and the rest is diamond. If the weight of ring is
$1$
gram, the bride receives, (atomic wt. of
$Au = 197$
,
$C = 12$
)
Chemistry
Some basic concepts of chemistry
$Ag_3X \to 3Ag + X$
$20\, g$
of a silver salt of a substance produced
$10.8\, g$
of pure silver upon strong heating. Atomic mass of X is (At. wt. of
$Ag$
is
$108\, u$
)
Chemistry
Some basic concepts of chemistry
An alkaloid contains 17.28 % of nitrogen and its molecular mass is 162. The number of nitrogen atoms present in one molecule of alkaloid is
Chemistry
Some basic concepts of chemistry
An ore contains 1.34% of the mineral argentite,
$Ag_2S$
, by mass How many gram of this ore would have to be processed in order to obtain 1.00 g of pure solid silver, Ag ?
Chemistry
Some basic concepts of chemistry
An organic compound on analysis gave
$C = 54.2\%, H = 9.2\%$
A by mass. Its empirical formula is
Chemistry
Some basic concepts of chemistry
Elements and compounds are the examples of pure substances The properties of a compound are different from those of its constituent elements
Chemistry
Some basic concepts of chemistry
Equivalent weight of a base =
$\frac{molecular \, weight}{acidity}$
Acidity is the number of replaceable hydrogen atom in one molecule of the base
Chemistry
Some basic concepts of chemistry
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
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