atomic structure molecules and nuclear chemistry - Category wise Question and Answer Practice Test with Solutions

Question : 21 [NDA]

What is the number of mole(s) of H₂ (g) required to saturate one-mole benzene?

a) 3

b) 2

c) 1

d) 4

Question : 22 [NDA]

Which one among the following transitions of electron of hydrogen atom emits radiation of the shortest wavelength?

a) n = 4 to n = 3

b) n = 3 to n = 2

c) n = 2 to n = 1

d) n = 5 to n = 4

Question : 23 [CDS]

Which one among the following is correct regarding ²⁰Ne, ²³Na+, ¹⁹F– and ²⁴Mg²⁺?

a) They are isoelectronic with each other

b) They are isotopes of each other

c) They are isomers of each other

d) All of the above

Question : 24 [UPPCS (Mains) 2005]

Which one of the following pairs constitutes particle-antiparticle pair?

a) Proton-Neutron

b) Photon-Electron

c) Electron-Positron

d) Neutron-Neutrino

Question : 25 [CDS]

Age of fossil may be found out by determining the ratio of two isotopes of carbon. The isotopes are

a) C-12 and C-14

b) C-13 and C-14

c) C-12 and C-13

d) C-12 and carbon black