Search
.Management Sciences
Category: Chemistry Mcqs
Alkali and alkaline earth metals impart colours when heated over burner. It is due to______________?
A. Smaller electronegativity of alkali metals
B. Smaller ionic radius of these metals
C. De-excitation of electrons from higher energy levels to low energy level
D. Excitation of electrons from low energy levels to higher energy levels
Steam causes more sever burn than the boiling water because it possesses _________________?
A. Latent heat of fusion
B. Latent heat of vaporization
C. Latent heat of sublimation
D. All of the above
The hydrogenation of phenol in the presence of Ni and heat gives_________________?
A. cyclohexane
B. n – hexane
C. 1 – hexanol
D. cyclohexanol
Chlorination of water may be harmful if the water contains_________________?
A. Ammonia
B. Dissolved oxygen
C. Carbon dixide
D. All
Equal masses of methane and oxygen are mixed in empty container at 250?(C) The fraction of total pressure exerted by oxygen is___________________?
A. one / seventeen
B. sixteen / seventeen
C. one / three
D. two / three
Greater shielding effect corresponds to ionization energy value___________________?
A. Greater
B. Lesser
C. Remain same
D. No effect
Which one of the following element has highest oxidation state in its compounds ?
A. Cr
B. Mn
C. Sn
D. O
Recent Comments