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 electron can be added to a halogen atom to form a halide ion with?
8 valence electrons
7 valence electrons
2 valence electrons
3 valence electrons
Correct answer is A
A halide ion is a halogen atom bearing a negative charge (which is an anion with a charge of -1). The halide anions are fluoride (F−), chloride (Cl−), bromide (Br−), iodide (I−) and astatide (At−).
Sublimation
Crystallization
Distillation
Evaporation
Correct answer is A
Sublimation is the transition of a substance directly from the solid to the gas state, without passing through the liquid state.
When cathode rays are deflected onto the electrode of an electrometer, the instrument becomes?
Bipolar
Negatively charged
Positively charged
Neutral
Correct answer is B
When these cathode rays are deflected onto an electrode of an electrometer, the instrument measured a negative charge. The rays tested also were deflected by application of an electric field.
The general formula for the Alkanals is?
R\(_2\)CO
RCHO
ROH
RCOOR
Correct answer is B
Alkanals or Aldehydes have the general formula RCHO while Alkanones or Ketones have the general formula RCOR'.
Where R and R' may be alkyl or aryl groups.
Proteins in acid solution undergo?
Substitution
Fermentation
Hydrolysis
Polymerisation
Correct answer is C
Acid hydrolysis refers to a hydrolysis reaction occurring under acidic conditions. Acid hydrolysis of a protein breaks the polymer down into its constituent amino acids.