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Chemistry
5 questions in this quiz
MCQ
1. What is the atomic number of Carbon?
6
8
12
14
MCQ
2. Which gas is produced when acid reacts with a metal?
Hydrogen
Oxygen
Carbon dioxide
Nitrogen
MCQ
3. What is the pH of pure water?
7
0
14
5
MCQ
4. Which element is most abundant in the Earth's crust?
Oxygen
Silicon
Iron
Aluminium
MCQ
5. What is the chemical formula of table salt?
NaCl
KCl
CaCl2
MgCl2