C2.4 Salts – LearnITbyTests

1. What are the by-products between the reactions of acids with metal carbonates?

Soluble salt

Water

Carbon (IV) oxide

All of the above

2. The fixed amount of water which is contained within the crystal structure of salt is called

3. When metal carbonates are heated they form metal oxides and carbon (IV) oxide apart from pure carbonates of Sodium and Potassium which only lose their water of crystallization True or Fasle

FALSE

Maybe

TRUE

None

4. All suphates salts are soluble except those of Barium and Lead. True or False

FALSE

Maybe

True but calcium suplhate is slightly soluble

None

5. The ions that remain unchanged during a chemical reaction are called

Reactors

Precipitates

Spector ions

None

6. In a precipitation reaction, the two reactants must be soluble salts and one of the products must be insoluble (precipitate)True or False

FALSE

Maybe

TRUE

None

7. Salt is a substance formed when the hydrogen ions in acid are wholly or partially replaced by a Cation. True or False

FALSE

Maybe

TRUE

None

8. Mention the two key methods of preparing salts

Preparation of soluble salts

Preparation of insoluble salts

Preparation of crystal salts

Both A and B

9. A solution that cannot dissolve any more solute at a given temperature or in a given solvent is called

Hydrated solution

Anhydrous solution

Saturated solution

None

10. Mention the uses of salts

Calcium chloride is used in the extraction of sodium metal by electrolysis

Sodium carbonate is used in the softening of hard water

Potassium Nitrate is used for making fireworks and gun powder

All of the above

11. Explain direct synthesis or direct combination of elements

It is a process where a mixture of metal and non-metal elements are heated together to form a soluble salt

Iron + Sulphide = Iron (II) Sulphide { Fe(S) + S(S) = FeS(S) }

Iron + Chlorine = Iron (III) Chlorine { 2Fe(s) + 3CL2 (g) = 2FeCL3 (S)

All of the above

12. Bases of most reactive metals such as Potassium, Sodium and Calcium are soluble in water while the rest are insoluble i.e Zinc, Aluminium, copper etc. True or Fasle

FALSE

Maybe

True except Magnesium which is slightly soluble in water.

None

13. A salt that contains a replaceable hydrogen atom i.e. NaHCO3 is known as:

normal salts

Acid or basic salts

Double salts

Basic salts

14. What happens when salts are exposed to the atmosphere?

Some absorb so much water in the atmosphere that they form solutions and are known as Deliquescent salts e.g. Calcium chloride, Potassium hydroxide and Zinc chloride.

Some absorb the water in the atmosphere but do not dissolve and are known as hygroscopic e.g. Cobalt (II) Chloride, Potassium Nitrate, common Table salt.

Some salts lose some of the water of crystallization to the atmosphere and are known as efflorescence e.g. Iron (Ii) Suphate heptahydrate, Sodium sulphate deca-hydrate

All of the above

15. What is the Main method of preparation of insoluble salts?

Neutralization

Direct synthesis

Precipitation

None

16. Which of the following is not among a normal acid in the list?

NaCl

Na 2CO3

KHSO4

K2SO4

17. All carbonates salts are insoluble in water except those in Group 1 metals? {Potassium, Sodium, Lithium. Yes or No

Yes

Maybe

None

18. A salt that contains hydroxyl ion i.e. Mg(OH)Cl is known as:

Normal salts

Acid or basic salts

Double salts

Basic salts

19. Which of the following is not among an acid salt?

KHSO4

NaHCO3

Zn(OH)Cl

NaH2PO4

20. Which of the following equation describes the effect of HEAT on Metal nitrates of the most reactive metal, medium reactive metal and least reactive metal

Most reactive metal e.g. Potassium and sodium { Metal Nitrate = Metal Nitrite + Oxygen

Medium reactive metals e.g. Calcium, Zinc, Lead { Metal Nitrate = Metal oxide + Nitrogen (IV) oxide + Oxygen }

Least reactive metal e.g. Silvery and Mercury { Metal Nitrate = Metal + Nitrogen (IV) oxide + Oxygen }

All of the above

21. The method of preparing a specific salt may depend on what factor

Ease to form crystals

The solubility of the salt in water

Its rate of reaction to water

None

22. Which of the following is not among a basic salt?

Mg(OH)Cl

Zn(OH)Cl

CuCO3Cu(OH)2

Ca(NO3)2

23. Which of the following equation describes the effect of heat on Sulphates

The sulphates of Potassium, Sodium, Calcium and Magnesium are stable and only lose their water of crystallization when heated

Zinc and Copper Sulphates when heated the form Metal Oxides + Sulphur (IV) oxide + water { ZnSO4.7H2O (S) = ZnO(S) + SO2 (g) + 7H2O (l) }

Iron (II) Sulphate decompose to give Iron (II) oxide, Sulphur (IV) oxide , Sulphur (VI) oxide and water. 2FeSO4.7H2O(S) = Fe2O3(S) + SO2(g) + SO3(g) + 14H2O(l

All of the above

24. Which of the following equation describes the action of heat on Carbonates and hydrogen carbonates

Metal Carbonate = Metal oxide + carbon (IV) oxide

Metal Hydrogen Carbonates = Metal oxides + water + Carbon (IV) oxide

Ammonium carbonate = Ammonia + Carbon (IV) oxide + steam

All of the above

25. A salt in which there are two different atoms or cations i.e. KAl(SO4)2.12H2O is known as

normal salts

Acid or basic salts

Double salts

Basic salts

26. Give the name of the reaction where the metal ions of the salts simply exchange their anions to form new salts is called? Pb(NO3 )2 (aq) + MgSO4 (aq) = PbSO4 (S) + Mg(NO3)2 (aq)

Direct combination

Direct synthesis

Double decomposition

None

27. The most reactive metals salts are soluble in water {Potassium, Sodium and Ammonium} True or False

TRUE

FALSE

Maybe

None

28. Name the types of salts

Normal salts

Acid or basic salts

Double salts

All of the above

29. Mention the ways of preparing soluble salts

By reaction of an acid and a metal { Zn (s) + H2SO4 (aq) =ZnSO4(aq) + H2 (g) }

By reaction of acids on insoluble bases { MgO (s) + H2SO4 (aq) = MgSO 4 (aq) + H2O (l) }

By Neutralization ( Reaction of an acid and alkali ) - { 2NaOH (aq) + 2H2O (l) = Na2SO4 (aq) + 2H2O (l) }

All of the above

30. What is the name for the action of acids on soluble base (alkali)?

Crystallization

Saturation

Neutralization

Precipitation

31. All chlorides are soluble except Lead and silver however Lead (II) chloride is soluble in hot water. Yes or No

Maybe

Yes

None

32. A salt that does not contain any replaceable hydrogen atom i.e. Na 2CO3 is known as:

Normal salts

Acid or basic salts

Double salts

Basic salts

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