Diagnostic test (10th grade)

The oxidation number of oxygen in most compounds is:

• +2

• -2

• 0

• +1

In the compound NaCl, the oxidation number of chlorine is _____.

Which element typically has an oxidation number of +1 in its compounds?

• a) Oxygen

• b) Chlorine

• c) Sodium

• d) Carbon

The sum of oxidation numbers in a neutral compound is always _____.

In H₂SO₄, the oxidation number of sulfur is:

• +4

• +6

• -2

• +2

When a metal reacts with a non-metal, the compound formed is usually:

• Covalent

• Ionic

• Metallic

• None of the above

In the compound NaCl, sodium has _____ charge and chlorine has _____ charge.

Which of the following is NOT an ionic compound?

• NaCl

• KBr

• H₂O

• CaF₂

The chemical formula for alumin_ium oxide is _____.

In a covalent bond, electrons are:

• Transferred

• Shared

• Lost

• Gained