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 gas that is most useful in protecting humans against solar radiation is?
chlorine
ozone
carbon (IV) oxide
hydrogen sulphide
Correct answer is B
The ozone layer in the stratosphere absorbs a portion of the radiation from the sun, preventing it from reaching the planet's surface.
Most importantly, it absorbs the portion of UV light called UVB.
The gasification of coke is used for the manufacturing of?
producer gas
natural gas
synthetic gas
industrial gas
Correct answer is C
Gasification is a process that converts biomass- or fossil fuel-based carbonaceous materials into synthetic gases
Hydrogen sulphide gas can act as?
an oxidizing agent
a dehydrating agent
a bleaching agent
a precipitating agent
Correct answer is D
When Hydrogen sulphide gas is bubbled through solutions of such metals, the colored sulphides are precipitated.
Hydrogen sulphide is a also strong reducing agent.
The oxidation of ammonia in excess air produces?
NO
N2O
NO2
N2O4
Correct answer is A
In the presence of heated platinum catalyst, ammonia reacts with excess air to produce nitrogen (II) oxide, NO, (instead of nitrogen) and water.
increasing the temperature and decreasing the pressure
increasing the pressure and increasing the temperature
decreasing the temperature and increasing the pressure
decreasing the pressure and decreasing the temperature
Correct answer is C
No explanation has been provided for this answer.