Education
Class 10 Chemistry Chapter 18 Salts Full Unit Test 3
Grade 10 Chemistry Chapter 18 Salts Full Unit Test 3Class 10 chemistry chapter 18 salt test answers, Class 10 chemistry chapter 18 salt test notes, Class 10 chemistry chapter 18 salt test pdf, class 10 chemistry chapter 10 salt, class 10 chemistry chapter 10 test yourself,
Prepare for your matric Chemistry examination with the Class 10 Chemistry Chapter 18: Salts Full Unit Test 3, part of the Punjab Board 2027 Model Papers and chapter-wise test series. This comprehensive unit test is designed according to the new syllabus issued by PECTAA Punjab to help students revise the complete unit, assess their subject knowledge, and strengthen their exam preparation. Practice the Class 10 Chemistry Salts chapter test to improve your understanding of important concepts and prepare effectively for board examinations. These Punjab Board Class 10 Chemistry model papers are useful for revision, self-assessment, classroom tests, and annual examination preparation. Visit 786Times.com for more chapter-wise tests, full unit tests, and Punjab Board 2027 Model Papers for students.
Chapter: 18
Total Time: 35 min
CHAPTER WISE CLASS TEST
(Test # 3)
Chemistry
Total Marks: 25
NOTE: Four possible answers A, B, C and D to each question are given. The choice which you think is correct, fill that circle in front of that question with Marker or Pen ink. Cutting or filling two or more circles will result in zero mark in that question.
TIME: 10 MinOBJECTIVEMARKS: 8
Q.1:(08)
1.Which salt will be formed when marble pieces react with dilute nitric acid?
(A) Sodium nitrate(B) Calcium nitrate(C) Potassium nitrate(D) Magnesium nitrate
✔ Answer: (B) Calcium nitrate — CaCO3 + 2HNO3 → Ca(NO3)2 + H2O + CO2↑
2.Strong electrolytes dissociate:
(A) Partially into ions(B) Completely into ions(C) Not at all(D) Only when heated
✔ Answer: (B) Completely into ions
3.Which hydroxides are soluble in water?
(A) Magnesium hydroxides(B) Zinc hydroxides(C) Sodium hydroxides(D) Silver hydroxides
✔ Answer: (C) Sodium hydroxide (NaOH)
4.Water insoluble salt is:
(A) Calcium sulphate(B) Sodium sulphate(C) Potassium sulphate(D) Magnesium sulphate
✔ Answer: (A) Calcium sulphate (CaSO4)
5.Which sulphates are insoluble in water?
(A) Sodium and potassium sulphates(B) Ammonium and magnesium sulphates(C) Barium, lead and calcium sulphates(D) Zinc and iron sulphates
✔ Answer: (C) BaSO4, PbSO4, CaSO4
6.Potassium nitrate is prepared by reacting KOH with:
(A) H2SO4(B) HCl(C) HNO3(D) CH3COOH
✔ Answer: (C) HNO3 — KOH + HNO3 → KNO3 + H2O
7.End point in titration is indicated when colour changes from:
(A) Colourless to yellow(B) Blue to green(C) Light pink to colourless(D) Yellow to red
✔ Answer: (C) Light pink to colourless
8.Which gas is produced when Zn reacts with H2SO4.
(A) O2(B) Cl2(C) CO2(D) H2
✔ Answer: (D) H2 — Zn + H2SO4 → ZnSO4 + H2↑
786Times — Chemistry Chapter-18 Test # 3
TIME: 25 MinSUBJECTIVEMARKS: 17
(PART – I)
Q.2 Write short answers to following questions.(6×2=12)
i.Name two insoluble carbonates.
Ans: Calcium carbonate (CaCO3) and zinc carbonate (ZnCO3). (Also CuCO3, PbCO3.)
ii.What is salt?
Ans: A salt is an ionic compound formed when the hydrogen of an acid is replaced by a metal or ammonium ion. Example: NaCl.
iii.What is a crystal lattice?
Ans: The regular, repeating three-dimensional arrangement of ions (or atoms) in a crystal is called a crystal lattice.
iv.What is the method of preparing salt from acid and insoluble base?
Ans: Add the insoluble base in excess to the warm dilute acid, filter off the excess base, then evaporate the filtrate and crystallize.
CuO + H2SO4 → CuSO4 + H2O
CuO + H2SO4 → CuSO4 + H2O
v.Why ionic salts exist in solid state?
Ans: Oppositely charged ions attract each other with strong electrostatic forces and are held in fixed positions in the crystal lattice, so ionic salts are solids at room temperature.
vi.How is zinc sulphate prepared in laboratory?
Ans: Add excess zinc to warm dilute H2SO4 until bubbling of H2 stops. Filter off the excess zinc, heat the filtrate to saturation, cool slowly to get crystals, wash with cold distilled water and dry.
Zn + H2SO4 → ZnSO4 + H2↑
Zn + H2SO4 → ZnSO4 + H2↑
(PART – II)
Note: Attempt the following question.
Q.3: Describe which salts are soluble in water and which are insoluble.(5)
Ans:
Soluble salts: all sodium, potassium and ammonium salts; all nitrates; chlorides (except AgCl, PbCl2); sulphates (except BaSO4, PbSO4, CaSO4).
Insoluble salts: carbonates (except those of Na, K, NH4); AgCl and PbCl2; BaSO4, PbSO4 and CaSO4.
Hydroxides: only NaOH, KOH (and NH4OH) are soluble; Mg(OH)2, Zn(OH)2 and AgOH are insoluble.
Soluble salts: all sodium, potassium and ammonium salts; all nitrates; chlorides (except AgCl, PbCl2); sulphates (except BaSO4, PbSO4, CaSO4).
Insoluble salts: carbonates (except those of Na, K, NH4); AgCl and PbCl2; BaSO4, PbSO4 and CaSO4.
Hydroxides: only NaOH, KOH (and NH4OH) are soluble; Mg(OH)2, Zn(OH)2 and AgOH are insoluble.
786Times — Chemistry Chapter-18 Test # 3
