Chemistry Test Inorganic Chemistry 2

Question 1

Which of the following oxides is amphoteric?

Accepted Answer

Al2O3

Answer

Al2O3 is amphoteric, reacting with both acids and bases to form salts and water.

Question 2

What is the oxidation state of chromium in K2Cr2O7?

Accepted Answer

+6

Answer

In K2Cr2O7, potassium is +1 and oxygen is -2, so chromium must be +6 to balance the charge.

Question 3

Which gas is produced when copper reacts with concentrated nitric acid?

Accepted Answer

NO2

Answer

Copper reacts with concentrated HNO3 to produce NO2 (nitrogen dioxide), a brown gas.

Question 4

The VSEPR geometry of the SF6 molecule is:

Accepted Answer

Octahedral

Answer

SF6 has 6 bonding pairs and no lone pairs, giving it an octahedral geometry.

Question 5

Which of the following is a Lewis acid?

Accepted Answer

BF3

Answer

BF3 is a Lewis acid because it has an empty p orbital and can accept an electron pair.

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