Book Title:
Author(s):
Some examples from this set of practice questions
1.
One faraday is equal to (a) 9650 coulombs or (b) 96500 coulombs. (c) two moles of element (d) half a mole of electron
Answer: (b) 96500 coulombs.
2.
On which of the electrodes does oxidation occur? (a) at the cathode (b) at the anode (c) at the electrolyte (d) at the half electrode.
Answer: (b) at the anode * Oxidation always occurs at the anode. A trick to remember oxidation (starts with a vowel) and anode (starts with a vowel).
3.
What is galvanizing?
Answer: The method involves spraying iron materials (such as pipes, roofing sheets, etc.) with powdered zinc or dipping the materials (when properly cleaned) into molten zinc.
4.
When a solution of copper (II) salt was electrolyzed, 3.20g of copper was deposited. Calculate the quantity of electricity required for electrolysis. (Cu=6; 1 F = 96500C).
Answer: Solutions Equation of the reaction is: Cu2+ (aq) + 2e- → Cu(s) 2F → 64(1 mol) Amount in mole copper deposited is n = n = = 0.050 mol Form the equation, 2 mols of electrons will deposit 1 mol of Cu. But 1 mol of electrons = Faraday = 96500C .: 2 mol of electrons will require 2 X 96500C to deposit 1 mol of Cu. 1 mol of Cu requires 2 X 96500C .: 0.05mol of Cu will require 2 X 9500 X 0.05C Quantity of electricity required = 96500 coulombs.
5.
Which of the following is not an electrolyte? (a) silver trioxonitrate (V) solution (b)acidulated water (c) copper (II) tetraoxo sulphate (VI) solution (d) sugar solution
Answer: The correct option is d. Sugar readily dissolves in water, but because it does not dissociate into ions in solution, it is considered a nonelectrolyte; solutions containing glucose do not, therefore, conduct electricity.
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Stuvia is a marketplace, so you are not buying this document from us, but from seller marakuh. Stuvia facilitates payment to the seller.
No, you only buy these notes for $7.99. You're not tied to anything after your purchase.
4.6 stars on Google & Trustpilot (+1000 reviews)
95132 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now
