Chemistry MCQs / Q&A

Which group contains elements that exist as monoatomic molecule? A. 1 B. 2 C. 14 D. 18 (Correct)

Molar heat of vaporization of water is_________________? A. 40.7 KJ/mole (Correct) B. 40.7 J/mole C. 40.7 cal/mole D. 40.7 Kcal/mole

The number of lone pairs in XeOF4 is_________? A. O B. 1 (Correct) C. 2 D. 3

Carbon in wrought iron is present as_________? A. Silicon carbide B. Iron carbide (Correct) C. Graphite D. Partly as iron carbide and partly as graphite

The number of atoms in a molecule determines________________? A. macromolecule B. macromolecule C. molecularity D. atomicity (Correct)

Which of the following polymers belong to the class of formaldehyde resin ? A. Melamine resins (Correct) B. Teflon C. Dacron D. None of these

Softening of hardened steel is done by its_____________________? A. Normalising B. Tempering (Correct) C. Annealing D. Carburising

The molar mass of an organic acids is determined by____________? A. Depression of freezing point B. Volumetric method (Correct) C. Victor Meyer’s method D. Osmosis method

When light is exposed to transition element then electrons jump from lower orbitals to higher orbitals in______________________? A. orbitals of f-subshell B. orbitals of d-subshell C. orbitals of p-subshell D. both A & B …

The number of d-electrons in Fe2+ (Z = 26) is not equal to that of____________? A. p-electrons in Ne(Z = 10) B. s-electrons in Mg(Z = 12) C. d-electrons in Fe(Z = 26) D. p-electrons in CI(Z = 17) (Correct)