Question

In: Chemistry

QUESTION 4 Which statements, if any, are true about the electrolysis of aqueous magnesium fluoride? Check...

QUESTION 4 Which statements, if any, are true about the electrolysis of aqueous magnesium fluoride? Check the box in front of each true statement.

Magnesium will collect at the cathode.

Magnesium will collect at the anode.

Fluorine gas will collect at the cathode.

Fluorine gas will collect at the anode.

Hydrogen gas will collect at the cathode.

Hydrogen gas will collect at the anode.

Oxygen gas will collect at the cathode.

Oxygen gas will collect at the anode.

B.

which statements, if ny, are true about the electrolysis of molten iron(III) chloride? Check the box in front of each true statement.

Iron will collect at the cathode.

Iron will collect at the anode.

Chlorine gas will collect at the cathode.

Chlorine gas will collect at the anode.

Hydrogen gas will collect at the cathode

. Hydrogen gas will collect at the anode.

Oxygen gas will collect at the cathode.

Oxygen gas will collect at the anode.

Solutions

Expert Solution

A) let us write the reaction taking place for magnesium fluoride

    Overall reaction          MgF2 --------->Mg +F2

     Half reaction 1    Mg2 + 2e- --------> Mg

    Half reaction   2 2F-   --------->F2 + 2e-

In Half reaction (1) magnesium ion accepts electron to form magnesium, Hence it's an reduction reaction

In half reaction (2) Fluoride ion loses electrons to form fluoride gas. Hence it is an oxidation reaction

In an electrochemical cell , oxidation takes place at anode and reduction takes place at anode

hence,

Magnesium will be formed at anode

Fluoride gas will be liberated at cathode

The above two are the correct options

B)     Let us write the reactions

overall reaction          FeCl3 -----------> Fe2+ + 3Cl-

half reaction 1             Fe ---------> Fe3+ + 3e-

Half reaction 2         Cl2 +e- ----------> 2Cl-

(The reaction is not balanced , since we only need to figure out oxidation and reduction reaction)

In Half reaction 1: Fe loses electron to form iron ion. Hence it is an oxidation reaction.

In half reaction 2 : Chlorine gas accepts electrons to form chlorine ion . Hence it is an reduction reaction

Since we know that oxidation takes place at anode and reduction takes place at cathode

Hence,

iron will be collected at anode

Chlorine gas will be liberated at cathode

The above two are correct options

queen_honey_blossom answered 2 years ago
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