Zonal Education Office - Vadamaradchy

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Grade :9 Science English medium

Third Exam Electrolysis

Name: *

School: *

1. which fluid is placed in the below practical when the ampere meter does not show reading *

5 points

Kerosene oil

Salt solution

Acidified water

Copper sulphate

2. Which one is an Electrolyte *

5 points

Kerosene oil

Petrol

Water with hydrochloric acid

Distilled water

3. Which is the correct statement among the following *

5 points

Solid ion compounds do not conduct electricity

The water solution of ion compounds does not conduct electricity

Ionic compounds in the molten state do not conduct electricity

Movable ions are not found in liquid ion compounds

4. The non electrolyte is *

5 points

Sodium chloride

Sodium chloride solution

Water with added nitric acid

Sea water

5.What is your observation in this practical *

5 points

Deposition of a reddish brown substance at the positive electrode

Gas bubbles will come out of the negative electrode

The blue color of the solution will gradually decrease

The negative electrode will gradually dissolve

6. Which of the following statements are incorrect *

5 points

The positive electrode is connected to the positive terminal of the dry cell

A liquid or solution that does not conduct electricity is called an electrolyte

Electrolysis is the process of passing electricity through an electrolyte and subjecting it to chemical transformation

Movable ions are not found in solid ionic compound

7. What is the reason for Distilled water does not conduct electricity *

5 points

No microorganisms are found in distilled water

Ions are not found in distilled water

Distilled water is colorless

Distilled water is odorless

8. Statement - Solid ion compounds do not conduct electricity but Liquid and solution ion compounds conduct electricity. The reason is that ions are found in solid ions but they do not move independently and therefore do not conduct electricity. But independently conductive ions are found in liquid and solution ion compounds that conduct electricity. *

5 points

The statement is false but the reason is correct

The reason is correct but the statement is false

The reason and the statement are correct

The reason and the statement are false

Answer questions 9,10 based on the test structure given below 9. What is the change that occurs during the below experiment *

5 points

Gas bubbles appear only from the negative electrode

Gas bubbles appear from the positive , negative electrode

The reddish-brown substance deposits on the negative electrode

positive electrode will be corrosion

10. which is not a testing method to identify the gas liberated at each electrode? *

5 points

With a glowing splint is put into two test tubes , the splint reignites

The splint is reignites , when put the splint in if the gas evolved at the positive electrode, if the gas evolved at the negative electrode is separated and a lighted splint is put into it, the gas burns with a squeaky ''pop'' sound

The lime water turned milky when the gases found in the two test tubes containing the gases were injected separately into the clear lime water.

if the gas evolved in the test tube and a lighted splint in put it, the gas burns with a squeaky 'pop' sound

11.The Non-application of electrolysis is *

5 points

Metal extraction

production of quicklime

Electroplating

Production of salt

12. Which is a Non-metallic metal used as electrodes *

5 points

Gold

Platinum

Graphite

Copper

13. What is the ratio between the oxygen gas and hydrogen gas, when electrolyzed the acidified water *

5 points

1:2

2:1

1:4

4:1

14.Which is an Unobservable during electroplating *

5 points

The copper will gradually dissolve

copper is deposited on the iron nail

The color of the copper sulphate solution does not change

The iron nail will gradually dissolve

15. Which method is not considering when during electroplating *

5 points

The plating metal will be used as a positive electrode

The material to be plated will be used as a negative electrode

The salt solution of the plating metal is used as the electrolyte

The plating metal will be used as a negative electrode

16. What are the characteristics are incorrect when a high quality of a electroplating *

5 points

The plating material should adhere tightly to the plating surface

Should be plastered to a uniform thickness

Must be firm

Must be rough surface

17.The Unused metal in plating is *

5 points

Gold

Iron

Nickel

Chromium

18. Which are correct when consider the characteristics of high quality electroplating . A - Very small current must be applied. B - Electrolyte must be dilute. C -the potential difference should be applied *

5 points

A,B are correct

only A

Only B

All are correct

19. What is the property hasn't contain the metal plate? *

5 points

Corrosion

Security

Attractive

Value increase

Other:

20. What are the Materials needed for electroplating to silver key *

5 points

Silver rod, concentrated silver salt solution

Dilute silver salt solution, silver stick

Concentrated silver salt solution, Key

Dilute silver salt solution , Carbon rod

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