Which of the following compounds is covalent?
CaCI2
MgO
NaN
CH4
Correct answer is D
No explanation has been provided for this answer.
What is responsible for metallic bonding?
Sharing of electrons between the metal atoms
Attraction between the atomic unclei and cloud of electrons
transfer of electrons from one atom to another
Attraction between positive and negative ions
Correct answer is B
No explanation has been provided for this answer.
The presence of unpaired electrons in an atom of a transition metal gives rise to
paramagnetism
nalleability
ductility
shiny appearance
Correct answer is A
No explanation has been provided for this answer.
The atom of an element X combines with aluminium (13AI)?
AIX 2
AI 2X
AI2X 2
AI 2X 3
Correct answer is D
No explanation has been provided for this answer.
Elements which belong to the same group in the Periodic Table are characterized by
difference of +1 in the oxidation numbers of successive members
presence of the same number of outermost electrons in the respective atoms
difference of 14 atomic mass units between successive members
presence of the same number of electron shells in the respective atoms
Correct answer is B
No explanation has been provided for this answer.