High School: 9th and 10th Grade - Chemistry - Electrolysis 1 Solution - MCQGeeks.com

Q.1.

Pick the correct combination for the names of the positive and negative electrodes.

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+ve anode -ve negode
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+ve cathode -ve anode
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+ve posode -ve cathode
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+ve anode -ve cathode

Q.2.

Electrolysis means which of the following?

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Splitting up substances using heat
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Splitting up substances using electrons
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Splitting up substances using electricity
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Joining up substances using electricity

Q.3.

During electrolysis...

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+ve ions move to cathode and -ve ions move to anode
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+ve ions move to anode and -ve ions move to cathode
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+ve ions and -ve ions move to cathode
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+ve ions and -ve ions move to anode

Q.4.

Pick the correct half equations to show what happens when PbBr is electrolysed.

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Cathode: Pb+ + e- → Pb Anode: 2Br- → Br2 + 2e-
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Anode: Pb2+ + 2e- → Pb Cathode: 2Br- → Br2 + 2e-
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Cathode: Pb2+ + 2e- → Pb Anode: Br- → Br + 2e-
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Cathode: Pb2+ +2e- → Pb Anode: 2Br- → Br2 + 2e-

Q.5.

What do we call the substance broken down by electrolysis?

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Solvent
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Solute
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Substrate
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Electrolyte

Q.6.

When a negatively charged ion reaches the positively charged electrode...

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It can lose an electron to become a neutral atom
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It can lose an electron to become a positive ion
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It gains an electron to become a neutral atom
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It gains an electron to become a negative ion

Q.7.

Pick the correct combination to show what is collected at each electrode when molten copper bromide is electrolysed.

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Copper ions at the cathode, Bromine gas at the anode
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Copper metal at the anode, Bromide ions at the cathode
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Copper metal at the cathode, Bromine gas at the anode
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Copper metal at the anode, Bromine gas at the cathode

Q.8.

Why does an electrolyte need to be either molten or in solution?

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To ensure the atoms can move
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To enable the ions to move
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So that water ions can be involved in the reaction
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So that the electrodes can be put in the electrolyte

Q.9.

Pick the correct half equations to show what happens when an aqueous solution of KCL is electrolysed.

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Cathode: K+ + e- → K Anode: 2Cl- → Cl2 +2e-
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Cathode: 2H+ + 2e- → H2 Anode: 2Cl- → Cl2 + 2e-
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Cathode: H+ + e- → H Anode: 2Cl- → Cl2 +2e-
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Cathode: K+ + e- → K Anode: Cl- → Cl + e-

Q.10.

When lead bromide is electrolysed...

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Pb 2+ is reduced at the cathode, Br- is oxidized at the anode
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Pb2+ is oxidized at the cathode, Br- is reduced at the anode
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Pb2+ is reduced at the anode, Br- is oxidized at the cathode
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Pb3+ is reduced at the cathode, Br- is oxidized at the anode