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.
I and II
I, II, and III
III and IV
all of the above
Correct answer is A
No explanation has been provided for this answer.
Which of the following is a non-metal that remains liquid at room temperature?
Chlorine
Phosphorus
Bromine
Helium
Correct answer is C
Bromine is a chemical element with the symbol Br and atomic number 35. It is the third-lightest halogen and is a volatile red-brown liquid at room temperature that evaporates readily to form a similarly coloured vapour.
Which one of the following is not a mixture?
Air
Mercury
Milk
Cement
Correct answer is B
A mixture is a material made up of two or more different chemical substances which are not chemically combined.
Mercury is a chemical element with the symbol Hg and atomic number 80.
A 'breath test' used by traffic police to check drunken driving uses?
Tumeric on filter paper
Silica gel coated with saliva nitrate
Potassium permanganate-sulphuric acid
Potassium dichromatic-sulphuric acid
Correct answer is D
The earliest developed breathalyzer was based on reaction of alcohol if present in the exhaled air with a cocktail of chemicals containing sulfuric acid, potassium dichromate, silver nitrate, and water. Silver nitrate catalyzes the reaction between alcohol and potassium dichromate in acidic medium.
What is the chemical name for the compound CuCO\(_{3}\)?
Copper (iii) carbonate
Copper (ii) carbonate
Copper (i) carbonate
Copper
Correct answer is B
Copper(II) carbonate or cupric carbonate is a chemical compound with formula CuCO\(_{3}\)