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.
The pollutant that contributes to the depletion of the ozone layer is
CFCs
NO2
SO2
CO
Correct answer is A
No explanation has been provided for this answer.
The compound produced when sodium peroxide is heated with excess sodium is
Na2CO3
Na2O
NaNO2
NaOH
Correct answer is B
No explanation has been provided for this answer.
Phosphorus-32
Cobalt-60
Carbon-14
Iodine-131
Correct answer is B
No explanation has been provided for this answer.
0.05 moldm-3
0.30 moldm-3
0.50 moldm-3
0.40 moldm-3
Correct answer is C
2g NaOH is contained in 100cm3
Xg NaOH is contained in 1000cm3
Xgram = \(\frac{2\times 1000}{100}\) = 20g
Mole = \(\frac{20}{40}\) = 0.50mol/dm3
The process that requires the use of hardwater in its operation is
Tanning
Bottling
Laundry
Dyeing
Correct answer is B
No explanation has been provided for this answer.