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 pairs of substances has the highest heat of neutralization?
strong acid and strong base
weak acid and weak base
strong acid and weak base
weak acid and strong base
Correct answer is A
In other terms, the stronger the acid the greater the amount of hydrogen ions present in the solution, and hence the more alkali that should be required to neutralise the solution, hence increasing the enthalpy
0.5
1.0
1.5
3.0
Correct answer is C
Where 3mols of H2So4 = 1 mol of (Al2SO4)3
y mols of H2SO4 = 0.5 mol of (Al2SO4)3
Then cross multiply to have:
y = 3×0.51
y = 1.5 moles
The most suitable indicator for the reaction between NaOH and HCOOH is?
bromocresol
methyl orange
methyl red
phenolphthalein
Correct answer is D
Phenolphthalein is suitable as indicator for this reaction i.e strong base and weak acid
ethanoic acid
hydrochloric acid
sodium chloride
sodium hydrogentrioxocarbonate(iv)
Correct answer is B
Low PH means strongly acidic cause acidity increases with decreasing PH values.
Example is Hydrochloric Acid