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Recent questions and answers in Chemistry
Questions
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CBSE XI
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Chemistry
Chemistry
Some basic concepts of chemistry
Structure of Atom
Classification of Elements and periodicity in properties
Chemical Bonding and Molecular Structure
States of Matter: Gases and Liquids
Chemical Thermodynamics
Equilibrium
Redox Reaction
Hydrogen
s-Block Elements
Some p-block Elements
Organic Chemistry: Some Basic Principles and Techniques
Hydrocarbons
Environmental Chemistry
What is weight of NaOH present in 250 cc of a 2M Solution ?
cl135748
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
answered
Feb 2, 2022
by
meena.clay6
1
answer
What is relative mass and charge of an electron?
cbse
class11
chemistry
ch2
structure-of-atom
answered
Feb 17, 2020
by
dashsourav53
1
answer
Which of the following ion is the largest in size ?
cbse
class11
chemistry
ch3
classification-of-elements-and-periodicity-in-properties
answered
Jul 11, 2019
by
meena.clay6
1
answer
Which of these dose not reflect the periodicity of the elements
cbse
class11
chemistry
ch3
classification-of-elements-and-periodicity-in-properties
answered
Jul 10, 2019
by
meena.clay6
1
answer
Which statement is incorrect?
cbse
class11
chemistry
ch3
classification-of-elements-and-periodicity-in-properties
answered
Jul 9, 2019
by
meena.clay6
1
answer
Which out of $Cu^{2+},Fe^{2+}$ and $Cr^{3+}$ has highest paramagnetism and why
cbse
class11
chemistry
ch2
structure-of-atom
answered
Jul 9, 2019
by
meena.clay6
1
answer
How many radial/spherical nodes will be present in the 5f orbitals?
cbse
class11
chemistry
ch2
structure-of-atom
answered
Jul 9, 2019
by
meena.clay6
1
answer
What will be the maximum number of electrons having the same spin in an atom with n+l=4 ?
cbse
class11
chemistry
ch2
structure-of-atom
answered
Jul 9, 2019
by
meena.clay6
1
answer
When is the energy of electron regarded as zero.
cbse
class11
chemistry
ch2
structure-of-atom
answered
Jul 9, 2019
by
meena.clay6
1
answer
How many unpaired electrons are present in $Pd (Z = 46)$?
cbse
class11
chemistry
ch2
structure-of-atom
answered
Jul 8, 2019
by
meena.clay6
1
answer
Which element does not have any neutron?
cbse
class11
chemistry
ch2
structure-of-atom
answered
Jul 8, 2019
by
meena.clay6
1
answer
The increasing order (lowest first) for the values of e/m (charge/mass) for
cbse
class11
chemistry
ch2
structure-of-atom
answered
Jul 5, 2019
by
meena.clay6
1
answer
Atomic number of an element is equal to the number of
cbse
class11
chemistry
ch2
structure-of-atom
answered
Jul 3, 2019
by
meena.clay6
1
answer
Which out of $Cu^{2+},Fe^{2+}$ and $Cr^{3+}$ has highest paramagnetism and why
cbse
class11
chemistry
ch2
structure-of-atom
answered
Jul 3, 2019
by
meena.clay6
1
answer
How many radial/spherical nodes will be present in the 5f orbitals?
cbse
class11
chemistry
ch2
structure-of-atom
answered
Jul 3, 2019
by
meena.clay6
1
answer
What will be the maximum number of electrons having the same spin in an atom with n+l=4 ?
cbse
class11
chemistry
ch2
structure-of-atom
answered
Jul 3, 2019
by
meena.clay6
1
answer
When is the energy of electron regarded as zero.
cbse
class11
chemistry
ch2
structure-of-atom
answered
Jul 3, 2019
by
meena.clay6
1
answer
How many unpaired electrons are present in Pd (Z = 46) ?
cbse
class11
chemistry
ch2
structure-of-atom
answered
Jul 3, 2019
by
meena.clay6
1
answer
Which element does not have any neutron?
cbse
class11
chemistry
ch2
structure-of-atom
answered
Jul 3, 2019
by
meena.clay6
1
answer
Yellow light emitted from a sodium lamp has a wavelength $(\lambda)$ of 580 nm. Calculate thefrequency $(ν)$ and wave number of the yellow light.
cbse
class11
chemistry
ch2
structure-of-atom
asked
Jul 3, 2019
by
meena.clay6
0
answers
Compare the wavelengths for the first three lines in the Balmer series with those which arise from similar
cbse
class11
chemistry
ch2
structure-of-atom
answered
Jun 28, 2019
by
meena.clay6
1
answer
A 1 MeV proton is sent against a gold leaf (Z = 79). Calculate the distance of closest approach for head on collision.
cbse
class11
chemistry
ch2
structure-of-atom
answered
Jun 28, 2019
by
meena.clay6
1
answer
Atomic number of an element is equal to the number of
cbse
class11
chemistry
ch2
structure-of-atom
answered
Jun 27, 2019
by
meena.clay6
1
answer
The angular momentum of electrons in d orbital is equal to
cbse
class11
chemistry
ch2
structure-of-atom
answered
Jun 27, 2019
by
meena.clay6
1
answer
Calculate the total number of angular nodes and radial nodes present in 30 orbitals
cbse
class11
chemistry
ch2
structure-of-atom
answered
Jun 27, 2019
by
meena.clay6
1
answer
An element with mass number 81 contains $31.7 \%$ more neutrons as compared to protons. Assign the atomic symbol.
cbse
class11
chemistry
ch2
structure-of-atom
answered
Jun 27, 2019
by
meena.clay6
1
answer
What is the relationship between frequency and wavelength of light?
cbse
class11
chemistry
ch2
structure-of-atom
answered
May 20, 2019
by
meena.clay6
1
answer
Neutrons can be found in all atomic nuclei except in one case. Which is this atomic nucleus and what does it consists of?
cbse
class11
chemistry
ch2
structure-of-atom
answered
May 20, 2019
by
meena.clay6
1
answer
Which are isosters ?
cbse
class11
chemistry
ch2
structure-of-atom
answered
May 16, 2019
by
meena.clay6
1
answer
Calculate the wave number of lines having the frequency of $5 \times 10^{16}$ cycles per sec
cbse
class11
chemistry
ch2
structure-of-atom
answered
May 16, 2019
by
meena.clay6
1
answer
Calculate the ratio of K.E and P.E of an electron in an orbit?
cbse
class11
chemistry
ch2
structure-of-atom
answered
May 16, 2019
by
meena.clay6
1
answer
Calculate the accelerating potential that must be applied to a proton beam to give it an effective wavelength of 0.005 nm.
cbse
class11
chemistry
ch2
structure-of-atom
answered
May 16, 2019
by
meena.clay6
1
answer
calculate the Broglie wavelength of an electron moving with 1% of the speed of light ?
cbse
class11
chemistry
ch2
structure-of-atom
answered
May 16, 2019
by
meena.clay6
1
answer
What is common between $d_{xy}$ and $d_{x2-y2}$ orbitals ?
cbse
class11
chemistry
ch2
structure-of-atom
answered
May 16, 2019
by
meena.clay6
1
answer
Calculate energy of 2 moles of photons of radiation whose frequency is $5 \times 10^{34}\;Hz$
cbse
class11
chemistry
ch2
structure-of-atom
answered
May 16, 2019
by
meena.clay6
1
answer
Define the term scintillations?
cbse
class11
chemistry
ch2
structure-of-atom
answered
May 15, 2019
by
meena.clay6
1
answer
Why some atoms shows radioactivity?
cbse
class11
chemistry
ch2
structure-of-atom
answered
May 15, 2019
by
meena.clay6
1
answer
Which one of the following is not true ?
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
answered
May 15, 2019
by
meena.clay6
1
answer
Equal moles of hydrogen and oxygen gases are placed in a container with a pin- hole through which both can escape. what fraction of the oxygen escapes in the time required for one half of the hydrogen to escape ?
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
answered
May 15, 2019
by
meena.clay6
1
answer
What is limiting reagent?
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
answered
May 15, 2019
by
meena.clay6
1
answer
Calculate the amount of water in gm produced by the combustion of 8 gms of Ethane
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
answered
May 15, 2019
by
meena.clay6
1
answer
What is heterogeneous mixture? Give an example.
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
answered
May 15, 2019
by
meena.clay6
1
answer
If $500\;mL$ of a 5 M solution is diluted to 1500 mL, what will be the molarity of the solution obtained ?
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
answered
May 14, 2019
by
meena.clay6
1
answer
An oxide of metal contains $60\%$ of the metal. What will be the equivalent weight of the metal ?
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
answered
May 14, 2019
by
meena.clay6
1
answer
How many moles of electron weight one kiligram ?
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
answered
Feb 19, 2019
by
meena.clay6
1
answer
What is molarity of a solution contain $5.84\;gms$ of $NaCl$ in 200 ml of solution ?
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
answered
Feb 19, 2019
by
meena.clay6
1
answer
What is the percentage of carbon , hydrogen and oxygen in ethanol ?
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
answered
Feb 19, 2019
by
meena.clay6
1
answer
What do you mean by gram atomic mass. one million silver atoms weigh $1.79 \times 10^{16}\;g$ . Calculate the gram atomic mass of silver.
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
answered
Feb 19, 2019
by
meena.clay6
1
answer
How can we say that sugar is solid and water is liquid ?
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
answered
Feb 19, 2019
by
meena.clay6
1
answer
write the number of moles in 8g of helium
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
answered
Feb 19, 2019
by
meena.clay6
1
answer
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