The work functions of Ag, Mg, K and Na respectively in eV are 4.3, 3.7, 2.25, 2.30. When an electromagnetic radiation of wavelength of 300 nm is allowed to fall on these metal surface, the number of metals from which the electrons are ejected is (1eV = 1.6022 × 10^-19 J).

• 4

• 3

• 2

• 5

For n = 3 energy level, the number of possible orbitals (all kinds) are

• 1

• 3

• 4

• 9

In 1 mole of NaCl the proton are

• 6 moles

• 11 moles

• 17 moles

• 28 moles

The values for all the quantum numbers for 15^th electron of chlorine are

• n = 3; l = 1; m = 0; s = -$\frac{1}{2}$

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

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

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

For which of the following species, Bohr theory does not apply?

• H

• He⁺

• H⁺

• Li²⁺

Which of the following is incorrect for radial distribution curve?

• n = 2; l = 0; Node = 1

• n = 3; l = 0; Node = 2

• n = 2; l = 1; Node = 0

• n = 3; l = 2; Node = 1

407.

Number of α and β emitted in the reaction, ₉₂U²³⁸ → ₈₂Pb²⁰⁶ are

• 6α and 8β

• 8α and 6β

• 6α and 4β

• 4α and 6β

Which of the following can be used to convert ${}_7{}^{14}\mathrm{N}$ into ${}_8{}^{17}\mathrm{O}$?

• Deutron

• Proton

• α-particle

• Neutron

Which of the following describes the shape of orbital?

• Principal quantum number

• Azimuthal quantum number

• Magnetic quantum number

• Spin quantum number

For an electron impossible combination of quantum number is

• n = 3; l = 2; m_l = -2; m_s = +$\frac{1}{2}$

• n = 3; l = 2; m_l = -3; m_s = +$\frac{\mathrm{}}{$ \frac{1}{2}$}$

• n = 4; l = 0; m_l = 0; m_s = -$\frac{1}{2}$

• n = 5; l = 3; m_l = 0; m_s = -$\frac{1}{2}$