An atom 17 protons, 17 electrons and 18 neutrons has a mass number of
17
18
34
35
52
Correct answer is D
No explanation has been provided for this answer.
Lead and tin are the components of
steel
bronze
brass
dentist amalgam
soft solder
Correct answer is E
No explanation has been provided for this answer.
Which of the following is an ore of aluminium?
Haematite
Magnetite
Siderite
Bauxite
Cassiterite
Correct answer is D
No explanation has been provided for this answer.
Which of the following metals is not extracted by electrolysis ?
lron
Sodium
Calcium
Magnesium
Aluminium
Correct answer is A
No explanation has been provided for this answer.
The following oxides react with both acids and bases to form salts except
zinc oxide
lead (ll) oxide
aluminium oxide
tin (IV) oxide
carbon (Iv) oxide
Correct answer is E
No explanation has been provided for this answer.