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.
Which of the following statement is false?
Acids react with some metals, liberating hydrogen
Acids react with carbonates, liberating carbondioxide
Acids conduct electricity and are decomposed by the current, liberating hydrogen at the anode
Acids have a sour taste
Acids change the colour of indicators
Correct answer is C
Thus, with a dilute solution of sulphuric acid and platinum electrodes, hydrogen gas is evolved at the cathode
Lead oxide
Magnesium oxide
Copper oxide
Tin oxide
Iron oxide
Correct answer is B
No explanation has been provided for this answer.
Cellulose and starches can be classified as one of the following?
sugars
sucrose
hydrocarbons
carbohydrates
isomers
Correct answer is D
No explanation has been provided for this answer.
The best way of collecting chlorine is?
by downward displacement of air
by upward displacement of air
over water
under water
over mercury
Correct answer is B
Chlorine gas is 2.5 times denser than air, hence it is best collected by the downward delivery or upward displacement of air.
sodium hydroxide solution
chlorine water
pure water
sodium hypochlorite solution
hydrochloric acid solution
Correct answer is A
we take cold aqueous to be concentrated solution of NaCl.
NaCl → \(Na^+ + Cl^-\)
\(H_2O → H^+ + OH^-\)
H ion will be preferably discharged at the cathode while Cl ion will be discharged at the anode(due to high concentration)
Thus, NaOH is left in the solution.