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.
C8H18 will undergo the following reactions except
cracking
combustion
substitution
addition
Correct answer is D
No explanation has been provided for this answer.
carry out some food tests
examine the pastry sample under a microscope
Do a chromatogram of the colouring extract
determine the molar mass of the colouring
Correct answer is C
Chromatography is used for quality control in the food industry, by separating and analyzing additives, vitamins, preservatives, proteins, and amino acids. It can also separate and detect contaminants such as aflatoxin, a cancer-causing chemical produced by a mold on peanuts.
Which of the following occurs when a solution of CuSO4 is electrolysed using copper electrodes?
The cathode becomes coated with copper
Both electrodes gain electrons
The blue colour of the solution fades gradually
The anode increases in mass
Correct answer is A
No explanation has been provided for this answer.
contains more ions
is neutral to litmus
has a lower molar mass
has a higher pH
Correct answer is A
0.10 mol \(dm^{-3}\) NaCI conducts electricity better than 0.10 mol \(dm^{-3}\) \(CH_3COOH\) because the solution of NaCI contains more ions. When an ionic compound like NaCI dissolves in water, it dissociates into its component ions, \(Na^+\) and \(Cl^{-}\)
Fe 2+ (aq) + Cu(s) → Fe 3+ + Cu 2+ (aq)
Fe 2+ (aq) + Cu(s) → Fe(s) + Cu2+ (aq)
Fe (s) + Cu2+ (aq) → Fe2+(aq) + Cu2+ (aq)
Fe(s) + Cu2+ → Fe2+(aq) + Cu(s)
Correct answer is D
No explanation has been provided for this answer.