10th class Chemistry, Chapter 18: Salts MCQs

1. Which base is not soluble in water?

1. (A) KOH
2. (B) Mg(OH)₂ ✓
3. (C) NaOH
4. (D) Na₂CO₃

2. The shape of the crystal of NaCl is:

1. (A) Cubic ✓
2. (B) Hexagonal
3. (C) Rhombic
4. (D) Trigonal

3. Which salts are always soluble in water?

1. (A) Chlorides
2. (B) Sulphates
3. (C) Nitrates ✓
4. (D) Carbonates

4. Which salt will be formed when marble pieces react with dilute nitric acid?

1. (A) Sodium nitrate
2. (B) Calcium nitrate ✓
3. (C) Potassium nitrate
4. (D) Magnesium nitrate

5. Water insoluble salt is:

1. (A) Calcium sulphate ✓
2. (B) Sodium sulphate
3. (C) Potassium sulphate
4. (D) Magnesium sulphate

6. Acids neutralize bases to form salt and:

1. (A) oxygen
2. (B) water ✓
3. (C) carbon dioxide
4. (D) hydrogen

7. A salt is a chemical combination of:

1. (A) neutral atoms
2. (B) only metals
3. (C) only non-metals
4. (D) positive and negative ions ✓

8. The ions of a salt are held together by:

1. (A) electrostatic force of attraction ✓
2. (B) covalent bonds
3. (C) hydrogen bonds
4. (D) weak gravitational force

9. Under ordinary conditions of temperature and pressure ionic compounds exist as:

1. (A) crystalline solids ✓
2. (B) liquids
3. (C) gases
4. (D) plasma

10. In NaCl each sodium ion is surrounded by ____ chloride ions.

1. (A) four
2. (B) two
3. (C) eight
4. (D) six ✓

11. In the NaCl lattice the bigger chloride ions are present at:

1. (A) the edges only
2. (B) the corners and the centre of each face ✓
3. (C) the centre only
4. (D) none of these

12. The crystal lattice of sodium chloride has the shape of a:

1. (A) pyramid
2. (B) face-centred cube ✓
3. (C) hexagon
4. (D) sphere

13. The melting points of ionic compounds are generally:

1. (A) low
2. (B) unpredictable
3. (C) very high ✓
4. (D) zero

14. Higher charges and smaller ion sizes lead to:

1. (A) no change
2. (B) lower melting points
3. (C) weaker attractions
4. (D) stronger attractions and higher melting points ✓

15. During melting of an ionic compound the attractive forces:

1. (A) do not change
2. (B) break down and let the ions move freely ✓
3. (C) double
4. (D) become stronger

16. Ionic compounds in the solid state:

1. (A) do not conduct electricity ✓
2. (B) are liquids
3. (C) conduct only when hot
4. (D) conduct electricity

17. Ionic compounds conduct electricity in:

1. (A) no state
2. (B) molten state or aqueous solution ✓
3. (C) gaseous state only
4. (D) solid state only

18. Ionic compounds are strong electrolytes because they:

1. (A) do not dissolve
2. (B) form molecules in water
3. (C) dissociate completely into ions in water ✓
4. (D) are insoluble

19. All sodium, potassium and ammonium salts are:

1. (A) partially soluble
2. (B) soluble ✓
3. (C) explosive
4. (D) insoluble

20. All metallic nitrates are:

1. (A) soluble only in acid
2. (B) insoluble in water
3. (C) soluble only when hot
4. (D) soluble in water ✓