Question

Question1

Marks: 1

What is the oxidation state assigned to Mn in potassium permanganate, KMnO₄? (Recall that answers must be numbers, that is, F is -1 not 1- in HF.)

Answer:

Question2

Marks: 1

What is the oxidation state assigned to O in hydorgen peroxide, H₂O₂?

Answer:

Question3

Marks: 1

What is the oxidation state assigned to B in B(OH)₃?

Answer:

Question4

Marks: 1

What is the oxidation state assigned to N in the nitrite ion, NO₂^-?

Answer:

Question5

Marks: 1

What is the oxidation state assigned to N in NH₂^-?

Answer:

Question6

Marks: 1

What is the oxidation state assigned to Cr in zinc dichromate, ZnCr₂O₇?

Answer:

Question7

Marks: 1

What is the oxidation state assigned to Xe in XeO₂F₂?

Answer:

Question8

Marks: 1

What is the oxidation state assigned to Xe in XeO₃F₂?

Answer:

Question9

Marks: 1

Easy: Complete and balance the following redox reaction in acid solution:

Cl₂(g) + Br^-(aq) ? Cl^-(aq) + Br₂(l)

For the balanced oxidation half-reaction, how many electrons are produced? How many bromide ions are there? (Always use smallest integer coefficients.)

Choose at least one answer.

	a. 1 e-
	b. 2 e-
	c. 1 Br-
	d. 2 Br-

Question10

Marks: 1

How many chlorine molecules are in the balanced equation?

Answer:

Question11

Marks: 1

Medium: Complete and balance the following redox reaction in acid solution:

Cu(s) + NO₃^-(aq) ? NO(g) + Cu²⁺(aq)

For the balanced reduction half-reaction, how many electrons are needed? How many H⁺ ions are there?

Choose at least one answer.

	a. 1 e-
	b. 2 e-
	c. 3 e-
	d. 4 e-
	e. 1 H+
	f. 2 H+
	g. 3 H+
	h. 4 H+

Question12

Marks: 1

How many H⁺ ions are in the balanced equation?

(If the H⁺ ions are the left side (reactant), write it as a positive number. If they are the right side (product), write it as a negative number.)

Answer:

Question13

Marks: 1

Complete and balance the following redox reaction in acid solution:

MnO₄^-(aq) + C₂H₂O₄(aq) ? Mn²⁺(aq) + CO₂(g)

For the balanced oxidation half-reaction, how many electrons are produced? How many H⁺ ions are there?

Choose at least one answer.

	a. 1 e-
	b. 2 e-
	c. 3 e-
	d. 4 e-
	e. 1 H+
	f. 2 H+
	g. 3 H+
	h. 4 H+

Question14

Marks: 1

How many H⁺ ions are in the balanced equation?

(If the H⁺ ions are the left side (reactant), write it as a positive number. If they are the right side (product), write it as a negative number.)

Answer:

Question15

Marks: 1

Complete and balance the following redox reaction in basic solution:

ClO^-(aq) + CrO₂^-(aq) ? Cl^-(aq) + CrO₄^2-(aq)

For the balanced oxidation half-reaction, how many electrons are produced? How many OH^- ions are there?

Hint given in the general feedback.

Choose at least one answer.

	a. 1 e-
	b. 2 e-
	c. 3 e-
	d. 4 e-
	e. 1 OH-
	f. 2 OH-
	g. 3 OH-
	h. 4 OH-

Question16

Marks: 1

How many OH^- ions are in the balanced equation?

(If the OH^- ions are the left side (reactant), write it as a positive number. If they are the right side (product), write it as a negative number.)