Electrolysis

Which of the following substances conducts electricity in both the solid and liquid states?

• Paraffin wax
• Potassium
• Potassium chloride
• Sulfur
• Venus

Tags

NGSS.HS-PS2-5

Molten lead(II) bromide is able to conduct electricity due to the presence of

• free atoms
• molten lead
• mobile ions
• bromine gas

Which of the following requires the largest number of electrons for complete discharge during electrolysis?

• 1 mol of Cu²⁺ ions

• 2 mol of O^2– ions

• 3 mol of Na⁺ ions

• 3 mol of Cl^– ions

Which of the following solutions would produce hydrogen gas at the cathode upon electrolysis?

1 Dilute nitric acid

2 Aqueous potassium hydroxide

3 Aqueous sodium chloride

• 1 only

• 1 and 2

• 2 and 3

• All of the above

Tags

NGSS.HS-PS2-5

Electrolysis was carried out on two solutions, copper(II) nitrate and titanium nitrate, using inert electrodes. The same quantity of electricity was passed through each of the two solutions. 32 g of copper was deposited in the first solution and 12 g of titanium in the second. What was the charge on the titanium ion?

• 1+
• 2+
• 3+
• 4+

In a simple cell, electrical energy is produced as a result of __________.

• a more reactive metal releasing electrons
• a less reactive metal releasing electrons
• ionic bonds being broken
• positive and negative ions coming together

Which of the following pairs of metals will produce the greatest voltage in a simple cell?

• Iron and copper
• Zinc and copper
• Calcium and magnesium
• Lead and copper

Which element requires the smallest number of electrons for one mole of atoms to be liberated during electrolysis?

• aluminium

• calcium

• copper

• sodium

In the electrolysis of molten sodium chloride, the products are molten sodium and chlorine gas. What is the volume of chlorine gas obtained at room temperature and pressure if the mass of molten sodium obtained is 230g?

• 60dm³

• 120dm³

• 240dm³

• 480dm³

Which row correctly state the product(s) formed and the type of energy generated by a hydrogen fuel cell?

• water, electrical

• water, carbon dioxide, electrical

• hydrogen, carbon, chemical

• water, chemical