Education
Class 10 Chemistry Chapter 18 Salts Full Unit Test 1
Grade 10 Chemistry Chapter 18 Salts Test series
Prepare for the Class 10 Chemistry Chapter 18: Salts Full Unit Test 1 with the Punjab Board 2027 Model Papers chapter-wise test series. This full-unit Chemistry test is designed according to the new syllabus issued by PECTAA Punjab to help students strengthen their understanding of salts and prepare effectively for their matriculation examinations. Practice chapter-wise questions, assess your preparation, and revise important concepts from the complete unit. These Class 10 Chemistry Model Papers 2027 are useful for self-assessment, classroom practice, revision, and examination preparation. Visit 786Times.com for more Punjab Board 2027 model papers, Chemistry chapter tests, and educational resources based on the latest PECTAA Punjab syllabus.
786Times
786Times
786Times
786Times
786Times
786Times
786Times
786Times
1. A salt is formed by the combination of:(Q-3)
(a) Neutral atoms
(b) Molecules
(c) Positive and negative ions
(d) Only positive ions
Answer: (c) Positive and negative ions
2. In NaCl structure, sodium ion occupy at the edges of:(Q-7)
(a) Square
(b) Cube
(c) Pentagon
(d) Center
Answer: (b) Cube
3. The melting point of an ionic compound depends mainly on:(Q-10)
(a) colour and shape
(b) mass and volume
(c) charges and sizes of ions
(d) temperature and pressure
Answer: (c) charges and sizes of ions
4. Which of the following carbonates is soluble in water?(Q-17)
(a) Calcium carbonate
(b) Barium carbonate
(c) Sodium carbonate
(d) Lead carbonate
Answer: (c) Sodium carbonate
5. Which hydroxide is only partially soluble in water?(Q-19)
(a) Sodium hydroxide
(b) Potassium hydroxide
(c) Ammonium hydroxide
(d) Calcium hydroxide
Answer: (d) Calcium hydroxide
6. The method involves the reaction of water soluble acid and base is called:(Q-21)
(a) Precipitation method
(b) Displacement method
(c) Titration method
(d) Electrolysis method
Answer: (c) Titration method
7. Which indicator is used in the preparation of sodium sulphate crystals?(Q-22)
(a) Methyl orange
(b) Litmus
(c) Phenolphthalein
(d) Universal indicator
Answer: (c) Phenolphthalein
8. Pure crystals of a salt are obtained by:(Q-25)
(a) Filtration only
(b) Evaporation and crystallization
(c) Distillation
(d) Decantation
Answer: (b) Evaporation and crystallization
9. Neutralization reaction occurs between:(Q-27)
(a) Acid and metal
(b) Acid and base
(c) Base and salt
(d) Metal and metal
Answer: (b) Acid and base
10. Crystals of salt are obtained by:(Q-29)
a) Heating strongly
b) Stirring continuously
c) Cooling the saturated solution
d) Adding more acid
Answer: (c) Cooling the saturated solution
786Times
786Times
786Times
786Times
786Times
786Times
786Times
Attempt any 10 Questions.10×2=20
i.What is a neutralization reaction?(Q-1)
The reaction between an acid and a base (alkali) to form a salt and water, e.g. HCl + NaOH → NaCl + H2O.
ii.What is a crystal lattice?(Q-3)
The regular, repeating three-dimensional arrangement of positive and negative ions in an ionic crystal.
iii.Why do ionic compounds exist as crystalline solids?(Q-4)
Strong electrostatic forces between oppositely charged ions hold them in a fixed, orderly pattern (crystal lattice), so they form hard crystalline solids.
iv.What shape does the crystal lattice of NaCl have?(Q-6)
Cubic: each Na+ ion is surrounded by six Cl− ions and each Cl− by six Na+ ions.
v.On which factors do the melting points of ionic compounds depend?(Q-10)
On the charges and sizes of the ions: higher charges and smaller ions give stronger attraction and a higher melting point.
vi.What happens when ionic compounds are dissolved in water?(Q-13)
The lattice breaks and the ions separate and become surrounded by water molecules (dissociation), so the solution can conduct electricity.
vii.Name two factors that affect the solubility of salts.(Q-15)
Temperature and the nature of the salt (and of the solvent).
viii.Which carbonates are soluble in water?(Q-17)
Carbonates of sodium, potassium and ammonium (Na2CO3, K2CO3, (NH4)2CO3).
ix.Why is calcium hydroxide called partially soluble?(Q-19)
Only a small amount of Ca(OH)2 dissolves in water (forming lime water); the rest stays undissolved.
x.What is meant by the titration method of preparing salts?(Q-21)
A method for soluble salts in which an acid and an alkali are mixed in exact amounts, using an indicator to find the neutral point, e.g. NaOH + HCl → NaCl + H2O.
xi.Why is evaporation carried out in salt preparation?(Q-24)
To remove excess water and make the solution saturated, so that salt crystals form when it is cooled.
xii.Give two uses of salts(Q-26)
NaCl is used for food seasoning and preservation; ammonium nitrate and other salts are used as fertilizers (also in medicines).
xiii.What is a neutralization reaction?(Q-28)
A reaction in which an acid reacts with a base to give a salt and water (H+ + OH− → H2O).
xiv.How are pure crystals of salt obtained?(Q-30)
Evaporate the solution to saturation, cool it so crystals form, filter them, wash with a little distilled water and dry.
