CSIR UGC JRF NET Chemistry Question Paper

CSIR UGC JRF NET Chemistry Question Paper
Just a check

Labels

About

Share It

Featured Posts

Featured Posts

Featured Posts

Popular Posts

Site Links

Showing posts with label Problems on Electrolysis Cells. Show all posts
Showing posts with label Problems on Electrolysis Cells. Show all posts

Solutions and Electrolytes: Fill in the blanks type chemsitry questions Part -1

- No comments
1. A mixture of two or more substances, which are homogeneously mixed, is called a __________.

2. __________ is defined as the amount of solute dissolved in a given amount of solvent.

3. A solution is composed of two components __________ and __________.

4. A solution containing one mole of solute per dm3 of solution is called one __________ solution.

5. Molarity is denoted by __________.

6. 1M solution of NaOH contains __________ gms of it dissolved per dm3 of solution.

7. A solution containing one mole of solute dissolved by per kg of solvent is called __________ solution.

8. Molality is denoted by __________.

9. 1M solution of H2SO4 contains __________ gms of it per kg of solvent.

10. The process in which ions are surrounded by water molecules is called __________.

11. The water molecules attached with the hydrated substance are called __________.

12. Hydrated copper sulphate evolves __________ water molecules on heating.

13. The interaction between salt and water to produce acids and bases is called __________.

14. The products of ionic concentration in a saturated solution at a certain temperature are called the __________.

15. Solubility product constant expressed as __________.

16. The suppression of ionization by adding a common ion is called __________.

17. The process of dissociation of an electrolyte into ions is known as __________.

18. The chemical decomposition of a compound in a solution or in fused state brought about by a flow of electric current is known as __________.

19. Electrolysis is performed in an electrolytic cell, which is known as __________.

20. The positive electrode of a voltmeter is called __________ and negative as __________.

Leave your answer in the comment section

Electrochemistry: Problems and solution on Electrolysis Cells

- No comments
Problem 1
Calculate the mass of copper metal produced from CuSO4 solution by passage of a 3.00-A current for 7250 seconds.











Problem 2
Calculate the time required to deposit 7.00 g of silver from a solution of AgNO3 with a current of 4.00 A.









If two quantities are given and the current is to be calculated,we convert the quantities given to coulombs and seconds and divide them to get the answer.

Problem -3
Calculate the current required to deposit 40.0 g of gold from AuCl3 solution in 7.00 hours.












Even if a metal is not produced, the ratio of moles of electrons involved in the reaction to moles of a chemical substance can be used to calculate the extent of the chemical reaction given in the balanced chemical equation.

Problem 4
Calculate the time required with a current of 10.5 A to reduce 50.0 g of PbO2 to PbSO4 in the lead storage cell (found in most automobile batteries).












Note that despite the oxidation state of lead in the reactant being +4, the ratio of moles of electrons to moles of lead(IV) oxide is 2 : 1 because the final product is not free lead. The number of moles of electrons involved is clearly given in the balanced equation no matter what the final product.The only new concepts that we used in solving these problems were the number of coulombs per mole of electrons and the fact that 1 A = 1 C/s.