Chemistry
Q. 1. During the electrolysis of molten lead bromide, which of the following takes place :
A : Bromine is released at the cathode. B: Lead is deposited at the anode.
C : Bromine ions gain electrons. D: Lead is deposited at the cathode.
Ans : - D.
Q. 2. Here is an electrode reaction : Cu → Cu2+ + 2e-. [i.e. Cu- 2e- →Cu2+]. At which electrode(anode or cathode) would such a reaction take place. Is this an example of oxidation or reduction.
Ans : - At anode. Oxidation.
Q. 3. A solution contains magnesium ions(Mg2+), iron (II) ions (Fe2+) and copper ions (Cu2+). On passing an electric current through this solution which ions will be the first to be discharged at the cathode. Write the equation for the cathode reaction.
Ans.: - Mg2+
Q.4. An electrode ‘A’ is connected to the positive terminal of a battery and electrode ‘B’ to the negative terminal.
(i) Give the names of the electrodes A & B.
(ii) Which electrode is the oxidizing electrode.
Ans : - (i) A – Anode, B – Cathode. (ii) A.
Q. 5. State the appropriate term used for : – A liquid or solution, which conducts electricity with accompanying chemical change.
Ans.: - Electrolytes.
Q.6. Electrons are getting added to an element Y.
(i) Is Y getting oxidized or reduced?
(ii) What charge will Y have after the addition of electrons?
(iii) Which electrode will Y migrate to during electrolysis?
Ans : - (i) Reduced (ii) Negative (iii) Anode
Q. 7. Explain how electrolysis is an example of redox reaction.
Ans.: - A redox reaction is one in which reduction and oxidation occurs simultaneously.
(i) Cathode (Reducing electrode) : – At cathode, the cations gain electrons to form neutral atoms. As electrons are gained, the ion is said to be reduced.
(ii) Anode (Oxidizing electrode) : – At anode, the anions lose electrons to form neutral atoms. As electrons are lost, the ion is said to be oxidized.
Q. 8. What kind of particles will be found in a liquid compound which is a non-electrolyte?
Ans.: -
A : Bromine is released at the cathode. B: Lead is deposited at the anode.
C : Bromine ions gain electrons. D: Lead is deposited at the cathode.
Ans : - D.
Q. 2. Here is an electrode reaction : Cu → Cu2+ + 2e-. [i.e. Cu- 2e- →Cu2+]. At which electrode(anode or cathode) would such a reaction take place. Is this an example of oxidation or reduction.
Ans : - At anode. Oxidation.
Q. 3. A solution contains magnesium ions(Mg2+), iron (II) ions (Fe2+) and copper ions (Cu2+). On passing an electric current through this solution which ions will be the first to be discharged at the cathode. Write the equation for the cathode reaction.
Ans.: - Mg2+
Q.4. An electrode ‘A’ is connected to the positive terminal of a battery and electrode ‘B’ to the negative terminal.
(i) Give the names of the electrodes A & B.
(ii) Which electrode is the oxidizing electrode.
Ans : - (i) A – Anode, B – Cathode. (ii) A.
Q. 5. State the appropriate term used for : – A liquid or solution, which conducts electricity with accompanying chemical change.
Ans.: - Electrolytes.
Q.6. Electrons are getting added to an element Y.
(i) Is Y getting oxidized or reduced?
(ii) What charge will Y have after the addition of electrons?
(iii) Which electrode will Y migrate to during electrolysis?
Ans : - (i) Reduced (ii) Negative (iii) Anode
Q. 7. Explain how electrolysis is an example of redox reaction.
Ans.: - A redox reaction is one in which reduction and oxidation occurs simultaneously.
(i) Cathode (Reducing electrode) : – At cathode, the cations gain electrons to form neutral atoms. As electrons are gained, the ion is said to be reduced.
(ii) Anode (Oxidizing electrode) : – At anode, the anions lose electrons to form neutral atoms. As electrons are lost, the ion is said to be oxidized.
Q. 8. What kind of particles will be found in a liquid compound which is a non-electrolyte?
Ans.: -