Which of the following molecules has a linear structure?
NH3
H2O
CO2
CH4
Correct answer is C
No explanation has been provided for this answer.
Which of the following can be used to predict the type of bonding in HCI?
pH value
Electronegativity difference
Heat of neutralization
Heat of solution
Correct answer is B
No explanation has been provided for this answer.
An element which can exist in two or more forms in the same physical state, exhibits
isotopy
structural isomerism
allotropy
variable valency
Correct answer is C
No explanation has been provided for this answer.
Which of the following changes is characteristic of an alpha-particle emission?
the nucleus loses two protons and two neutrons
a proton combines with an electron giving off heat
the nucleus splits into two equal parts
four neutrons are lost
Correct answer is A
No explanation has been provided for this answer.