Question

1.In the electrolysis of molten LiBr, which product forms at the anode? 1. Li(l) 2. Br2(g) 3. H2(g) 4. O2(g)

2.In the electrolysis of molten FeI3, which product forms at the anode? 1. Fe(l) 2. O2(g) 3. H2(g) 4. I2(g)

3.Hydrogen can be prepared by suitable electrolysis of aqueous calcium salts 1. True 2. False

4.Hydrogen can be prepared by suitable electrolysis of aqueous silver salts 1. False 2. True

5.What product(s) forms at the cathode in the electrolysis of an aqueous solution of NaCl? 1. O2 and H+ 2. Na 3. Cl2 4. H2 and OH-

Answer 1

1. In the electrolysis of molten LiBr, which product forms at the anode?

At cathode

Li⁺ + 1e^-   Li(l)

At anode

2Br^-   Br₂(g) + 2e^-

Answer: Br₂(g)      

2. In the electrolysis of molten FeI3, which product forms at the anode?

At cathode

Fe³⁺ + 3e^-   Fe(l)

At anode

2I^-   I₂(g) + 2e^-

Answer: I₂(g)      

3. Hydrogen can be prepared by suitable electrolysis of aqueous calcium salts

True

The metals which are above hydrogen in the electrochemical series can replace hydrogen

4. Hydrogen can be prepared by suitable electrolysis of aqueous silver salts

False

The metals which are below hydrogen in the electrochemical series cannot replace hydrogen

5. What product(s) forms at the cathode in the electrolysis of an aqueous solution of NaCl?

H₂ and OH^-