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Chemistry
List of top Chemistry Questions
What volume of hydrogen gas, at
$273\, K$
and
$1$
atm. pressure will be consumed in obtaining
$21.6 \,g$
of elemental boron (atomic mass
$= 10.8$
) from the reduction of boron trichloride by hydrogen ?
Chemistry
Some basic concepts of chemistry
What will be the mass of
$100$
atoms of hydrogen?
Chemistry
Some basic concepts of chemistry
What will be the molality of the solution containing
$18.25\, g$
of
$HCl$
gas in
$500\, g$
of water?
Chemistry
Some basic concepts of chemistry
What will be the weight of
$CO$
having the same number of oxygen atoms as present in
$22\, g$
of
$CO_{2}$
?
Chemistry
Some basic concepts of chemistry
Which of the following contains maximum number of atoms ?
Chemistry
Some basic concepts of chemistry
'x' grams of calcium carbonate was completely burnt in air. The weight of the solid residue formed is 28 g. What is the value of 'x' in grams ?
Chemistry
Some basic concepts of chemistry
x g of Ag was dissolved in
$HNO_3$
and the solution was treated with excess of NaCl when 2.87 g of AgCl was precipitated. The value of x is
Chemistry
Some basic concepts of chemistry
With increase of temperature, which of these changes ?
Chemistry
Some basic concepts of chemistry
Which of the postulates of Dalton's atomic theory is incorrect:
Chemistry
Some basic concepts of chemistry
Which of the following samples contains the smallest number of atoms ?
Chemistry
Some basic concepts of chemistry
Which of the following is the most accurate measurement?
Chemistry
Some basic concepts of chemistry
Which of the following has the highest mass ?
Chemistry
Some basic concepts of chemistry
$74.5\, g$
of a metallic chloride contain
$35.5\, g$
of chlorine. The equivalent weight of the metal is
Chemistry
Some basic concepts of chemistry
The least count of an instrument is
$0.01\, cm$
: Taking all precautions, the most possible error in the measurement can be:
Chemistry
Some basic concepts of chemistry
The equivalent weight of a solid element is found to be
$9$
. If the specific heat of this element is
$ 1.05\,J{{g}^{-1}}{{K}^{-1}}, $
then its atomic weight is:
Chemistry
Some basic concepts of chemistry
Most electropositive metals are obtained from their ores by
Chemistry
Electrolysis
Pure hydrogen is obtained by carrying electrolys is of
Chemistry
Electrolysis
The hydrogen electrode is dipped in a solution of pH = 3 at 25
$^\circ$
C. The potential of the cell would be (the value of 2.303 RT/F is 0.059 V)
Chemistry
Electrolysis
The molecule which has highest bond order is
KEAM
Chemistry
Molecular Orbital Theory
Oxygen molecule is paramagnetic in nature. What is the paramagnetic content in terms of magnetic moment in
$O^{-}_{2}$
?
Chemistry
Molecular Orbital Theory
The conditions for the combination of atomic orbitals to form molecular orbitals are stated below. Mark the incorrect condition mentioned here.
Chemistry
Molecular Orbital Theory
The electronic configuration of carbon is
$1s^2 2s^2 2p^2$
. There are
$12$
electrons in
$C_2$
. The correct electronic configuration of
$C_2$
molecule is
Chemistry
Molecular Orbital Theory
The increasing order of energies of various molecular orbitals of
$N_2$
is given below: $\sigma 1s < \sigma^* 1s
Chemistry
Molecular Orbital Theory
Which contain at least one e- in
$\sigma 2p$
bonding MO
Chemistry
Molecular Orbital Theory
$SF_6$
exists but
$OF_6$
does not because
Chemistry
Molecular Orbital Theory
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