Topic 9 - Reactions Of Acids
Standard Grade Chemistry course - Reactions of acids quiz
- 1.
What is a neutraliser?
- A.
A substance that can neutralise an acid only
- B.
A substance that can neutralise an alkali only
- C.
A substance that can neutralise an acid or an alkali
Correct Answer
C. A substance that can neutralise an acid or an alkaliExplanation
A neutralizer is a substance that has the ability to neutralize both acids and alkalis. It can react with an acid to form a salt and water, or with an alkali to form a salt and water. This means that a neutralizer can effectively balance the pH levels of both acidic and alkaline solutions, bringing them closer to a neutral pH of 7.Rate this question:
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- 2.
Which box or boxes are examples of neutralisation.
- A.
Adding lime to acidic soil
- B.
Using toothpaste to neutralise mouth alkalinity
- C.
Using lemon juice to neutralise bee stings
- D.
Using lemon juice to neutralise wasp stings.
Correct Answer(s)
A. Adding lime to acidic soil
D. Using lemon juice to neutralise wasp stings.Explanation
lime (calcium hydroxide - not the fruit) is an alkali, so will neutralise acidic soil. Lemon juice is acidic so will only neutralise alkaline wasp stings, (bee stings as they are acidic). The pH of the mouth is acidic not alkaline.Rate this question:
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- 3.
Name the salt produced when sodium carbonate reacts with sulphuric acid.
- A.
Sodium carbide
- B.
Carbon sulphide
- C.
Sodium sulphate
- D.
Sodium sulphide
Correct Answer
C. Sodium sulphateExplanation
acid + metal carbonate --> salt + water + CO2
Suphuric acid produce salts with the ending sulphate.Rate this question:
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- 4.
Complete the following equation: Magnesium oxide + hydrochloric acid -->
- A.
Magnesium chloride + hydrogen
- B.
Magnesium chloride + water
- C.
Magnesium chloride + water + CO2
Correct Answer
B. Magnesium chloride + waterExplanation
metal oxide + acid --> salt + waterRate this question:
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- 5.
When lime is added to acidic soil, the pH will get lower.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
If the soil is pH 4, when lime is added, the soil pH will increase towards pH 7 as the alkaline lime neutralises the acidity in the soil.Rate this question:
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- 6.
A salt is a substance in which the ___________ ion of the acid has been replaced by a metal (or ammonium) ion.
Correct Answer
hydrogen
H+
Hydrogen
H2Explanation
A salt is formed when the hydrogen ion (H+) of an acid is replaced by a metal or ammonium ion. This replacement results in the formation of a new compound known as a salt. The options "hydrogen," "H+," "Hydrogen," and "H2" all refer to the hydrogen ion present in the acid. Therefore, any of these options can be used to complete the given statement correctly.Rate this question:
- 7.
Name the type of reaction when sodium carbonate solution is added to copper (II) sulphate solution. (You may wish to use page 5 of the data booklet).
- A.
Neutralisation
- B.
Addition
- C.
Precipitation
- D.
Oxidation
Correct Answer
C. PrecipitationExplanation
Na2CO3(aq) + CuSO4(aq) --> CuCO3(s) + Na2SO4(aq)Rate this question:
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- 8.
Name the gas produced when magnsium reacts with nitric acid
- A.
Hydrogen
- B.
Carbon dioxide
- C.
Nitrogen
- D.
Oxygen
Correct Answer
A. HydrogenExplanation
(Reactive) metal + acid --> salt + H2Rate this question:
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- 9.
What is the average volume of acid used during the following titration.Rough titre - 25.2 cm31st titre - 22.3 cm32nd titre - 22.1 cm3
- A.
22.2
- B.
23.2
- C.
44.4
- D.
69.6
Correct Answer
A. 22.2Explanation
Ignore the rough titre - average of 1st and 2nd (22.3 + 22.1 = 44.4 / 2 = 22.2)Rate this question:
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- 10.
How many moles of HCl acid will be used if the volume is 20 cm3 and the concentration is 0.1 mol/l.
- A.
0.02
- B.
0.002
- C.
2
- D.
0.0002
Correct Answer
B. 0.002Explanation
n = c x v where v must be in litres, 0.1 x 20/1000 = 0.002 moles of acidRate this question:
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- 11.
What would be the concentration of magnesium hydroxide solution if 25 cm3 was needed to neutalise the HCl acid (conc 0.1, vol 20 cm3 ).Hint: You will need to write a balanced equation
- A.
0.4 mol/l
- B.
0.04 mol/l
- C.
0.08 mol/l
- D.
0.1 mol/l
Correct Answer
B. 0.04 mol/lExplanation
Mg(OH)2 + 2HCl --> MgCl2 + 2H2O
2 moles HCl --> 1 mole Mg(OH)2
0.002 moles HCl -> 0.001 moles Mg(OH)2
c = n/v = 0.001/(25/1000) = 0.04 mol/lRate this question:
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Mar 22, 2023Quiz Edited by
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Dec 06, 2010Quiz Created by
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