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Recent questions tagged cbse
Questions
What is weight of NaOH present in 250 cc of a 2M Solution ?
cl135748
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
asked
Feb 2, 2022
by
meena.clay6
1
answer
Which of the following ion is the largest in size ?
cbse
class11
chemistry
ch3
classification-of-elements-and-periodicity-in-properties
asked
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
asked
Jul 10, 2019
by
meena.clay6
1
answer
Find the volume of the tetrahedron formed by the four planes $x+y=0,y+z=0,z+x=0,x+y=1$
cbse
class12
ch10
asked
Jul 9, 2019
by
meena.clay6
1
answer
Which statement is incorrect?
cbse
class11
chemistry
ch3
classification-of-elements-and-periodicity-in-properties
asked
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
asked
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
asked
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
asked
Jul 9, 2019
by
meena.clay6
1
answer
When is the energy of electron regarded as zero.
cbse
class11
chemistry
ch2
structure-of-atom
asked
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
asked
Jul 8, 2019
by
meena.clay6
1
answer
Which element does not have any neutron?
cbse
class11
chemistry
ch2
structure-of-atom
asked
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
asked
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
asked
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
asked
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
asked
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
asked
Jul 3, 2019
by
meena.clay6
1
answer
When is the energy of electron regarded as zero.
cbse
class11
chemistry
ch2
structure-of-atom
asked
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
asked
Jul 3, 2019
by
meena.clay6
1
answer
Which element does not have any neutron?
cbse
class11
chemistry
ch2
structure-of-atom
asked
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
asked
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
asked
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
asked
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
asked
Jun 27, 2019
by
meena.clay6
1
answer
Write 3 points of difference between electromagnetic waves and matter waves
cbse
class11
chemistry
ch2
structure-of-atom
asked
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
asked
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
asked
Jun 26, 2019
by
meena.clay6
1
answer
What is the relationship between frequency and wavelength of light?
cbse
class11
chemistry
ch2
structure-of-atom
asked
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
asked
May 20, 2019
by
meena.clay6
1
answer
Which are isosters ?
cbse
class11
chemistry
ch2
structure-of-atom
asked
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
asked
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
asked
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
asked
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
asked
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
asked
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
asked
May 16, 2019
by
meena.clay6
1
answer
What is relative mass and charge of an electron?
cbse
class11
chemistry
ch2
structure-of-atom
asked
May 15, 2019
by
meena.clay6
1
answer
Define the term scintillations?
cbse
class11
chemistry
ch2
structure-of-atom
asked
May 15, 2019
by
meena.clay6
1
answer
Why some atoms shows radioactivity?
cbse
class11
chemistry
ch2
structure-of-atom
asked
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
asked
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
asked
May 15, 2019
by
meena.clay6
1
answer
What is limiting reagent?
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
asked
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
asked
May 15, 2019
by
meena.clay6
1
answer
What is heterogeneous mixture? Give an example.
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
asked
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
asked
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
asked
May 14, 2019
by
meena.clay6
1
answer
If the distance between two charge is reduced to half then the electrical force between them will become
cbse
class 12
electric charges and fields
asked
Mar 21, 2019
by
meena.clay6
1
answer
State Brewster's law
cbse
class
12
physics
wave-optics
asked
Mar 21, 2019
by
meena.clay6
1
answer
Ohm's law is true
cbse
class
12
physics
current-electricity
asked
Mar 20, 2019
by
meena.clay6
1
answer
If 5 percent of total current passes through a galvanometer of resistance G, then value of sheet resistance s is
cbse
class
12
physics
current-electricity
asked
Mar 20, 2019
by
meena.clay6
1
answer
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