Oxidation States in Chromium Nitrate

The video tutorial explains how to determine oxidation numbers for elements in chromium-3 nitrate (Cr(NO3)3). It begins by discussing the neutrality of the compound and the need for oxidation numbers to sum to zero. The nitrate ion (NO3) is identified as having a -1 charge, and the oxidation number of chromium is calculated to be +3. The tutorial also demonstrates how to calculate the oxidation number of nitrogen in the nitrate ion, which is found to be +5. The video concludes with a summary of the oxidation numbers for each element in the compound.

What is the primary focus when determining oxidation numbers in a compound like chromium-3 nitrate?

• The color of the compound

• The elements present in the compound

• The charge of the compound

• The physical state of the compound

Why do the oxidation numbers in chromium-3 nitrate add up to zero?

• Because it is a charged compound

• Because it is a neutral compound

• Because it contains only metals

• Because it is a gas

What is the ionic charge of the nitrate ion (NO3) in chromium-3 nitrate?

• 1-

• 2+

• 2-

• 1+

How many nitrate ions are present in chromium-3 nitrate?

• Four

• Three

• Two

• One

What must be the oxidation state of chromium in chromium-3 nitrate to balance the charges?

• +2

• +1

• +3

• +4

What is the oxidation number of oxygen in the nitrate ion?

• -1

• -4

• -2

• -3

In the equation for nitrate, what does 'x' represent?

• The charge of oxygen

• The oxidation number of nitrogen

• The total charge of the compound

• The number of nitrate ions

What is the oxidation number of nitrogen in the nitrate ion?

• +5

• +4

• +3

• +6

What is the result of the equation 3 + 3x - 18 = 0 in terms of x?

• x = 6

• x = 5

• x = 4

• x = 3

What is the significance of the oxidation numbers in chromium-3 nitrate?

• They determine the color of the compound

• They help in identifying the compound's reactivity

• They ensure the compound's neutrality

• They indicate the compound's solubility