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.
Aluminum hydroxide is used in the dyeing industry as a?
Dye
Dispersant
Salt
Mordant
Correct answer is D
Aluminum hydroxide is also used as a mordant in dyeing.
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−).
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?
R2CO
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.