Learn more about the properties, composition, and structure of substances (elements and compounds) with these Chemistry questions and answers. This Test can be used by students preparing for Chemistry in JAMB, WAEC, NECO or Post UTME.
chlorine has a larger atomic size
chlorine has a larger atomic mass
chlorine is more electronegative
there is no bonding orbitals within the hydrogen atom
Correct answer is C
The chlorine atom is much more electronegative than the hydrogen atom, which makes this bond polar.
What is the total number of shared pair of electrons in the compound above?
5
8
10
12
Correct answer is D
Each double bond has two pairs of valence electrons shared to form a covalent bonding. Also, every C-H bond, has 2 valence elctrons involved. Drawing the Lewis structure, you see that the above compound has 12 valence electrons shared.
The atomic number of an isotope of hydrogen is equal to its mass number because it
has a totally filled valence shell
has a high charge to mass ratio
does not contain neutrons
exhibits isotopy
Correct answer is C
No explanation has been provided for this answer.
\(1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{2} 3d^{4}\)
\(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{6}\)
\(1s^{2}2s^{2}2p^{6}3s^{2}3d^{4} 4s^{1}\)
\(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1}3d^{5}\)
Correct answer is D
Electronic configuration of Chromium: \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1}3d^{5}\)
Solubility in water
Melting point
Relative density
Crystalline nature
Correct answer is B
No explanation has been provided for this answer.