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Quiz 1 of0

Pre Practical Prep Quiz 2

Pre Practical Prep Quiz 2

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Question 1 of 12

1. Question
Cu metal is heated to form copper (II) oxide. How do you ensure that it is fully oxidised?
- When the pink solid has turned black.
- When the mass increase remains constant.
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Question 2 of 12

2. Question
What is the order of gases to test for, for QA?
- H2, O2, CO2, NH3
- CO2, NH3, H2, O2
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Question 3 of 12

3. Question
When do we need to test for CO₂?
- When we add NaOH to unknown chemical.
- When we add any acid to unknown chemical.
- When we add AgNO3.
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Question 4 of 12

4. Question
What is the correct volume of limewater to use when testing for CO₂?
- Half the test tube.
- Quarter of test tube.
- As little as possible.
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Question 5 of 12

5. Question
Why must limewater be prepared fresh?
- Limewater decomposes .
- It will turn white on its own when left on the bench.
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Question 6 of 12

6. Question
When testing for chloride ions and sulfate ions, it is important to acidify, so as to,
- To ensure any alkali has been neutralized.
- o ensure reaction is complete.
- Remove traces of carbonates which can give us false positive results.
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Question 7 of 12

7. Question
When doing redox iodine titration, starch should be added only in the last stage when it is page yellow:
- Iodine is chemically unstable.
- Starch can react with the air.
- Adding it early will affect the titre volume by as much as 2.0 cm3.
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Question 8 of 12

8. Question
When acidifying redox titration, the acid to acidify is:
- HNO3
- H2SO4
- HCl
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Question 9 of 12

9. Question
Colour of KMnO4 when it is reduced:
- Colourless to purple.
- Colourless to brown.
- Purple to colourless.
- Brown to colourless.
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Question 10 of 12

10. Question
When adding to excess in a test tube, how much do we add?
- Add until a reaction happens.
- Until 3/4 full of test-tube.
- Until test-tube is full.
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Question 11 of 12

11. Question
What should you do when you produce a ppt in NaOH but ppt is thick and creamy?
- Add excess NaOH.
- Pour half of the contents into the sink, then excess NaOH.
- Add water to dilute then add excess NaOH.
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Question 12 of 12

12. Question
Which of these form a yellow ppt?
- AgCl
- AgBr
- AgI
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