When the azimuthal quantum number has the value of 2, the number of orbitals possible are

• 7

• 5

• 0

• 3

The correct set of four quantum numbers for outermost electron of potassium (Z = 19) is

• 4, 1, 0, $\frac{1}{2}$

• 3, 1, 0, $\frac{1}{2}$

• 4, 0, 0, $\frac{1}{2}$

• 3, 0, 0, $\frac{1}{2}$

A body of mass x kg is moving with a velocity of 100 ms^-1. Its de-Broglie wavelength is 6.62 × 10^-35 m. Hence, x is (h = 6.62 × 10^-34 Js)

• 0.1 kg

• 0.25 kg

• 0.15 kg

• 0.2 kg

The wave number of the spectral line in the emission spectrum of hydrogen will be equal to $\frac{8}{9}$ times the rydberg's constant if the electron jumps from

• n =3 to n =1

• n = 10 to n=1

• n=9 to n=1

• n = 2 to n=1

The set of quantum numbers for the outermost electron for copper in its ground state is

• 4, 1, 1 +1/2

• 3, 2, 2, +1/2

• 4, 0, 0, +1/2

• 4, 2, 2, +1/2

Which one of the following sets of quantum numbers represents the highest energy level in an atom?

• n = 4, l = 0, m = 0, s = +$\frac{1}{2}$

• n = 3, l = 1, m = 1, s = +$\frac{1}{2}$

• n = 3, l = 2, m = -2, s = +$\frac{1}{2}$

• n = 3, l = 0, m = 0, s = +$\frac{1}{2}$

If the energies of the two photons in the ratio of 3 : 2, their wavelength will be in the ratio of

• 2 : 3

• 9 : 4

• 3 : 2

• 1 : 2

The spin only magnetic moment of Fe²⁺ ion (in BM) is approximately

• 4

• 7

• 5

• 6

209.

In an alkaline medium, glycine predominantly exists as/ in a/ an

• cation

• anion

• Zwitter ion

• covalent form

Which one of the followmg has no unpaired electrons?

• O${}_2^{-}$

• O${}_2^{+}$

• O${}_2^{2-}$

• O₂