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.
Aluminium
Chlorine
Magnesium
Sodium
Correct answer is B
No explanation has been provided for this answer.
Which of the following properties is characteristic of the halogens?
Ability to accept electrons readily
Ability to donate electrons readily
Ability to from basic oxides
Formation of coloured compounds
Correct answer is A
No explanation has been provided for this answer.
Which of the following statements about rare gases are correct?
Their outermost shells are fully filled
They are generally unreactive
Their outermost shells are partially filled
They have lone pair of
Correct answer is A
No explanation has been provided for this answer.
When sodium atom form the ion Na+,
it gains one proton
it achieves a noble gas configuration
its atomic number increases
it gains one electron
Correct answer is B
When the sodium atom forms an ion, Na+ it loses one electron, i.e. it achieves a noble gas electronic configuration. It will lose one of its 11 electrons to have 10 electrons like neon.
\(Na - e^- → Na^+\)
Na → \(Na^+ + e^-\)
Which of the following equations represents a substitution reaction?
C 2H10(g) + CI 2(g) → C4H9 CI(g) + HCI(g)
C 2H4(g) + HCI (g) → C 2H5 CI(l)
C2H2(g) + 2H 2(g) → C 2H6(g)
C 3H4(g) + 402(g) → 3CO2(g) + 2H 2O(g)
Correct answer is A
No explanation has been provided for this answer.