sec 3 ch 4 lesson 2

What is the quantity of electricity required to evolve 355 g of Cl₂ gas through the electrolysis of NaCl?                                               [Cl = 35.5]

• 9.25 × 10⁴ C

• 9.65 × 10⁵ C

• 9.65 × 10⁴ C

• 4.83 × 10⁵ C

How many faradays are requires to deposit (g atom) of magnesium from MgCl₂ melt?

• 1F

• 2F

• 3F

• 4F

What is the number of the gram equivalent masses of copper which can be deposited at the cathode of the electrolytic cell of CuSO₄ solution after passing a quantity of electricity equals 2.5 F?

• 1

• 2.5

• 1.25

• 2

On passing an electric current whose intensity is 9.65 A for 10 min. in an electrolytic cell, 3 g of a monovalent metal were deposited.

What is the gram atomic mass of this metal?

• 150g

• 100g

• 50g

• 5g

What is the amount of oxygen which can be liberated by using a quantity of electricity equals 96500 C (at ATP)?

• 6.5 L

• 5.6 L

• 11.2 L

• 22.4 L

According to the equation: 2H₂O_(l) →  2H_2(g) + O_2(g)

What is the volume of H₂ gas (at STP) produced from the electrolysis of the acidified water, when an electric current whose strength equals 4 A is passed in it for 30 min?

• 0.0836 L

• 0.0432 L

• 0.1672 L

• 0.836 L

The following equations represent the mechanism of iron rusting in no particular order .. Except …………….

• O2(g)+4H(aq)+4e^-→ 2H2O(l)

• Fe(s)→Fe(aq)^(2+)+2e^-

• Fe2O3.H2 O(s)+6H(aq)^+→2Fe(aq)^ (3+) + 4H2 O(l)

• 4Fe(aq)^(2+)+O2(g)+4H(aq)^+→〖4Fe〗(aq)^(3+)+4H2 O(l)

Which of the following statements about iron corrosion is correct?

• Iron rusting is an application of electrolysis.

• Iron rusting includes iron oxidation and hydrogen reduction

• The oxidation potential of the cathodic cover is higher than that of iron

• Bikes which are covered with a layer of TiO₂ do not rust

On electrolysis of a solution containing element (X) ion, element (X) atoms deposite on the cathode ..

Which of the following statements about element (X) ions is correct?

• They lose electrons at the cathode

• Element (X) lies before H in the electromotive series

• They gain electrons at the cathode

• They are negatively charged ions

What is the ion which moves towards the anode during the electrolysis of sodium hydroxide melt?

• Na⁺

• H⁺

• OH^–

• O^–