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Chemistry CIE iGCSE:
Acids + Analysis

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Triple only! Not for double science

  1. Which of the following changes are oxidation reactions?
I 2I- (aq)  I  +   2e-
II Acidified potassium manganate(VII) solution decolorises
III Iron(II)  iron(III)
 
  • A.   I and II
  • B.   I and III
  • C.   II and III
  • D.   I, II and III

2. Litmus and methyl orange are both indicators which can be used to distinguish between acids and alkalis.
What are the correct colours of these indicators in alkali?

  litmus Methyl orange
A blue red
B blue yellow
C red red
D red yellow
3. Sulfuric acid is a strong acid. A strong acid is one which ...
  • A.   is completely dissociated in aqueous solution
  • B.   is partially  dissociated  in aqueous solution
  • C.   contains a large amount of acid dissolved in water
  • D.   contains a small amount of acid dissolved in water
4. A small amount of ethanoic acid is dissolved in a large volume of water. What is the best description of this solution?
  • A.   A dilute solution of a strong acid
  • B.   A weak solution of a concentrated acid
  • C.   A dilute solution of a weak acid
  • D.   A weak solution of a dilute acid

5. Acids X and Y are of equal concentration.
Acid X has a pH value of 1 and acid Y a pH value of 5.
Acids X and Y could be...

  Acid X Acid Y
A Hydrochloric acid Ethanoic acid
B Ethanoic acid Hydrochloric acid
C Citric acid Ethanoic acid
D Sulfuric acid Hydrochloric acid

6. A student titrated a 10.0cm3 sample of dilute sulfuric acid with sodium hydroxide solution.
A suitable indicator to use in this titration and the colour change at the end point are ...

  Indicator Colour change
A Methyl orange Yellow to orange
B Methyl orange Red to orange
C universal Red to green
D universal Blue to green
7. Which solution has the highest pH?
  • A.   0.1 mol/dm3 sodium hydroxide solution
  • B.   0.1 mol/dm3 ethanoic acid
  • C.   0.1 mol/dm3 ammonia solution
  • D.   0.1 mol/dm3 hydrochloric acid

8. Which of the following statements are true about a weak base?

I It is partially dissociated in aqueous solution
II It has a pH greater than 7
III It reacts with acid forming a salt and water
 
  • A.   I and II only
  • B.   I and III only
  • C.   II and III only
  • D.   I, II and III

9. A student tested a solution for the presence of iodide ions. The test was positive.
The solution the student added and the observation made were ...

  Solution added Observation made
A Acidified silver nitrate White precipitate
B Acidified silver nitrate  Yellow precipitate
C Acidified barium nitrate White precipitate
D Acidified barium nitrate Yellow precipitate

10. A solution of X was tested and gave the following results:

Test Result
Add aqueous ammonia solution White precipitate formed which did not change when excess ammonia solution was added
Add dilute acid then aqueous potassium manganate(VII) Potassium manganate(VII) turns from purple to colourless

The name of solid X is ...

  • A.   aluminium  sulfate
  • B.   aluminium sulfite
  • C.   zinc sulfate
  • D.   zinc sulfite