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.
an acidic solution
an alkaline solution
a buffer solution
a neutral solution
Correct answer is A
When you dissolve ammonium chloride crystals in water (H2O), the ammonium chloride compound decomposes into its component ions: NH+4 and Cl−. The reaction of these ions with water gives an acidic solution.
Which of the following pH values indicates that a solution is a strong base?
1
5
9
13
Correct answer is D
No explanation has been provided for this answer.
On heating, the following trioxocarbonate (IV) salts decompose to give solid residue except
ammonium trioxocarbonate (IV)
calcium trioxocarbonate (IV)
lead (ll) trioxocarbonate(IV)
zinc trioxocarbonate (IV)
Correct answer is A
Ammonium trioxocarbonate (IV) is an unstable compound. It decomposes on heating to yield ammonia, carbon (IV) oxide and water. All of these are gases.
A substance L reacts with NH4NO3(aq) to generate ammonia gas. L is likely to be
HCl
NaOH
CH3COOH
CaSO4
Correct answer is B
The reaction between NH4NO3(aq) and any metal hydroxide produces ammonia, water and an alkali metal nitrate.
The energy evolved when magnesium burns in air is in the form of
heat
heat and sound
light and heat
sound
Correct answer is C
When a piece of magnesium ribbon is ignited, light and heat are produced.The reaction is an exothermic reaction, as well as one that produces light energy.