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The gases evolved at the positive and negative electrodes are Positive electrode Negative electrode A - VCE - SSCE Chemistry - Question 5 - 2003 - Paper 1
Question 5
The gases evolved at the positive and negative electrodes are Positive electrode Negative electrode A. oxygen hydrogen B. hydrogen oxygen C. chlorine hydrogen D.... show full transcript
Worked Solution & Example Answer:The gases evolved at the positive and negative electrodes are Positive electrode Negative electrode A - VCE - SSCE Chemistry - Question 5 - 2003 - Paper 1
Step 1
Identify the gases at the electrodes
Answer
In electrolysis, the type of gases formed at the electrodes depends on the substances being electrolyzed. For example, during the electrolysis of water, oxygen is produced at the positive electrode (anode), and hydrogen is produced at the negative electrode (cathode).
Step 2
Analyzing the options
Answer
A. oxygen at the positive electrode and hydrogen at the negative electrode - Matches the standard observation for water electrolysis.
B. hydrogen at the positive electrode and oxygen at the negative electrode - Incorrect.
C. chlorine at the positive electrode and hydrogen at the negative electrode - Can occur in the electrolysis of brine, but this isn’t the general case for water.
D. hydrogen at the positive electrode and chlorine at the negative electrode - Incorrect.
Step 3