Water can be identified by the use of?
anhydrous copper (II) tetraoxosulphate (VI)
anhydrous sodium trioxocarbonate (IV)
potassium heptaoxochromate (VII)
copper (II) trioxocaronate (IV)
Correct answer is A
Anhydrous CuSO4 will turn blue with water
The air around a petroleum refinery is most likely to contain?
CO2, SO3 and N2O
CO2, CO and N2O
SO2, CO and NO2
PH3 H2O and CO2
Correct answer is C
No explanation has been provided for this answer.
Argon is used in gas-filled electric lamp because it helps to?
prevent the reduction of the lamp fillaments
prevent oxidation of the lamp fillaments
make the lamp fillament glow brightly
keep the atmosphere in the lamp inert
Correct answer is B
Argon is used to fill incandescent and fluorescent light bulbs to prevent oxygen from corroding the hot filament.
Water has a rather high boiling point despite its low molecular mass because of the presence of?
hydrogen bonding
covalent bonding
ionic bonding
metallic bonding
Correct answer is A
No explanation has been provided for this answer.
Which group of elements forms hydrides that are pyramidal in structure?
III
IV
V
VI
Correct answer is C
No explanation has been provided for this answer.