Factors Affecting Electrolysis

Q.

What is the difference between diluted acid and concentrated acid

Q. The standard reduction potential of zinc and copper are -0.76 V and +0.34 V respectively. This implies that copper has tendency to get reduced.

1. lower
2. equal
3. higher

Q.

Why are Platinum electrodes used in electrolysis?

Q. In a group, a particular element has the lowest ionization potential, does it ionize most easily or least easily? Explain with example.

Q. Aqueous solution of sodium chloride conducts electricity due to the presence of free _______.

1. electrons
2. ions
3. molecules
4. atoms

Q. What is the difference between hydronium ion and hydrogen ion ?

Q.

Which is more dangerous: Sulphuric acid or Hydrochloric acid?

Q.

State the observation at the anode and at the cathode during the electrolysis of:

copper sulfate solution using copper electrode

Q.

Write the equation taking place at the anode in the process of purification of copper.

Q. 50. How addition of an electronegative elements or removal of an electropositive elements is oxidation.

Q.

How does electrolytic reduction differ from carbon reduction?

Q.

The electron releasing tendency of zinc is ________ than that of copper.

Q. Name any two practical applications of electrolysis.

Q.

Potassium chloride conducts electricity in _______ state.

Q.

Define electrometallurgy.

Q. Select the correct answer from the list in brackets :​ An aqueous electrolyte consists of the ions mentioned in the list. The ion which could be discharged most readily during electrolysis $[F{e}^{2+},C{u}^{2+},H^{1+}]$

Q.

Give the composition of electrolyte taken in Hall Heroults process.

Q.

Sodium metal is not refined by electrolytic reduction of an aqueous solution of Sodium sulphate but Copper is refined by electrolytic reduction of Copper sulfate. Explain these statements in light of the activity of a series of metals.

Q.

Select the correct answer from the list given in brackets :

The ion which is discharged at the anode during the electrolysis of copper sulphate solutions using copper electrodes as anode and cathode.

1. ${\mathrm{Cu}}^{2+}$

2. ${\mathrm{OH}}^{-}$

3. ${\mathrm{SO}}_4^2$

4. ${\mathrm{H}}^{+}$

Q.

How will you prepare 100 times dilute solution from 1 ml concentrated sulphuric acid solution ? What precaution would you suggest and why ?

Q. Which of the following statement about zeolite is false?

1. They are used as cation exchangers
2. Zeolites are aluminosilicates having three dimensional network
3. Some of the $Si{O}_4^{4-}$ units are repalced by $Al{O}_4^{5-}$ and $Al{O}_6^{9-}$^- ions in zeolite
4. They have open structure which enables them to take up small molecules

Q.

Give reasons why:
Zinc displaces lead from lead nitrate solution while gold is unable to do so.

Q. As we see the reactivity series, silver is a highly unreactive metal. Then what causes the silver metal to corrode?

Q. Pick the active electrode from the following.

1. Mercury
2. Platinum
3. Nickel
4. Graphite

Q.

Give reason for the following :

Aluminium is extracted from its oxide by electrolytic reduction and not by conventional reducing agents.

Q.

If hydrogen is a gas then it should attract anode electrode but it attracts cathode electrode.why?

Q.

Electrons are getting added to an element Y. Which electrode will Y migrate during the process of electrolysis?

Q. Copper sulphate solution is electrolysed using copper electrodes.​

(iii) State two appropriate observations for the above electrolysis reaction.

Q.

Give reason for the following :

The volume of hydrogen and oxygen formed at the cathode and anode are 2:1 by volume respectively.

Q.

11 (a) Explain why is molten sodium chloride decomposed by electric current while solid sodium chloride is not.