Pfund series are produced in the spectrum of hydrogen atom__________________?
(A) when electrons jump down to 2nd- orbit
(B) when electrons jump down to 3rd- orbit
(C) when electrons jump down to 4th- orbit
(D) when electrons jump down to 5th- orbit
The maximum number of orbitals present in a subshell that is represented by Azimuthal quantum number = 3 will be________________?
(A) 1
(B) 3
(C) 5
(D) 7
Rutherford bombarded _________________ particles in discovery of nucleus?
(A) Gamma-rays
(B) Alpha-rays
(C) Beta-rays
(D) X-rays
Charge of electron was measured by__________________?
(A) J.J Thomson
(B) Millikan
(C) Rutherford
(D) Perrin
Free neutron changes into proton with the emission of__________________?
(A) Neutrino
(B) Electron
(C) Both A & B
(D) Meson
Increase in atomic number is observed during_________________?
(A) Alpha emission
(B) Beta emission
(C) Both A & B
(D) Radioactivity
The number of fundamental particles in an atom of the lightest isotope carbon are_______________?
(A) 6
(B) 12
(C) 18
(D) 20
Atom cannot be divided into simple unitstheorized by________________?
(A) Rutherford
(B) Dalton
(C) Bohr
(D) Schrodinger
A technique of partition chromatography in which the solvent is in a pool at the bottom of container_______________?
(A) Adsorption chromatography
(B) Ascending chromatography
(C) Radial chromatography
(D) Descending chromatography
A substance having very high vapour pressure at its melting point on heating will show_______________?
(A) Melting
(B) Sublimation
(C) Decomposition
(D) Condensation