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21.
Which of the following elements is a halogen?
22.
What is the chemical formula for carbon dioxide?
23.
Which element is used to make pencils and as a lubricant?
Explanation:
24.
What is the chemical formula for sulfuric acid?
25.
What is the chemical symbol for copper?
26.
What is the common name for the compound NaCl?
Explanation:
27.
What is the chemical formula for table sugar (sucrose)?
Explanation:
28.
Which of the following is a strong base?
29.
Which functional group is present in alcohols?
Explanation:
30.
What is the general formula for alkanes?