The number of d-electrons retained in Fe2+ (At.no. of Fe = 26) ion is a) 4 b) 5 c) 6 d) ...
View QuestionPrincipal, azimuthal and magnetic quantum numbers are respectively related to
a) size, orientation and shape b) size, shape and orientation c) shape, size and orientation d) none of these
View QuestionAtoms consists of protons, neutrons and electrons. If the mass of neutrons and electrons were made half and two times respectively to their actual masses, then the atomic mass of
Atoms consists of protons, neutrons and electrons. If the mass of neutrons and electrons were made half and ...
View QuestionDifference between nth and (n + 1)th Bohr’s radius of H-atom is equal to its (n – 1)th Bohr’s radius. The value of n is:
Difference between nth and (n + 1)th Bohr's radius of H-atom is equal to its (n – 1)th ...
View QuestionLight of wavelength l shines on a metal surface with intensity x and the metal emits electrons per second of average energy, Z. What will happen to Y and Z if x is doubled?
a) Y will be double and Z will become half b) Y will remain same and Z will ...
View QuestionMany elements have non-integral atomic masses because
a) they have isotopes b) their isotopes have non-integral masses c) their isotopes have different masses d) Both a and ...
View QuestionSelect the pairs of ions which have same electronic configuration?
a) Cr3+, Fe3+ b) Fe3+, Mn2+ c) Fe3+, Co3+ d) Se3+, Cr3+ Answer: b Explanation: Fe3+ and Mn2+ have ...
View QuestionThe electronic configuration of an element is 1s2, 2s2, 2p6, 3s2, 3p6, 3d5, 4s1. This represents its
The electronic configuration of an element is 1s2, 2s2, 2p6, 3s2, 3p6, 3d5, 4s1. This represents its: a) excited ...
View QuestionA flask containing air (open to the atmosphere) is heated from 300 K to 500 K. The percentage of the air escaped into the atmosphere is
a) 16.6 b) 40 c) 60 d) 20 Answer: b Explanation:
View QuestionEqual volumes of the gases which do not react together are confined in separate vessels. The pressure is 200 mm and 400 mm of Hg respectively. If the two gases are mixed together what will be the pressure of the resulting mixture (temperature remaining constant)
a) 400 mm b) \[\sqrt{400mm}\] c) 300 mm d) 200 mm Answer: c Explanation:
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