Question

Which of the following is false?
a) The number of orbitals for a given value of l is equal to 21+1
b) The number of orbitals for a given value of n is equal to n
n?
c) An atom having unpaired electrons is diamagnetic in nature.
d) All s orbitals are spherical symmetrical in shape.​

Answer 1

Answer:

Option B and C are false.

Explanation:

B) The number of orbitals for a given n (principal quantum number) is $n^{2}$.

For example: if n=1 i.e. for hydrogen then the number of orbitals will be 1.

If n=2 i.e. for Helium then the number of orbitals will be 2x2 = 4.

(n is the symbol for principal quantum number which specifies the energy level of an electron and the size of it's orbital.)

C) An atom having unpaired electrons is paramagnetic in nature. Electrons spin around their axis and crate a dipole moment, acting as small magnets. This diploe moment gets cancelled due to being present in opposite directions in the paired electrons, but in unpaired electrons the dipole moment is there. This leads to paramagnetism.

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Answer 2

Option C is the correct answer

c) An atom having unpaired electrons is diamagnetic in nature is a false statement.

Explanation:

Option a) is correct statement

l is the azimuthal quantum number It is the number of orbitals for a given value of l .l has possible values of 2l+1

Option b) is the correct statement

The number of orbitals for a given value of n is equal to n is a correct statement as it is the number of orbitals which is the principal quantum number.

Option c) is an incorrect statement An atom having unpaired electrons is diamagnetic in nature. For a particular value of l we have the value of m also it is if l is 3 it will have +1,0-1.

The paramagnetic substance will have unpaired electrons whereas diamagnetic atom has no unpaired electrons

Option d) is the correct statement

The  shape of s orbitals are spherical symmetrical

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