Vidaara.orgClass 10 · Chemistry
CodeVID-C10-03-T2-01
Assignment — Reactivity Series & Ionic Bonding
Name: ____________________
Roll No.: __________
Date: ____________
General Instructions
- All questions are compulsory.
- Section A carries 1 mark each, Section B 2 marks, Section C 3 marks and Section D 5 marks.
- Write balanced equations and electron-dot ideas wherever asked. Only final answers are given at the end — for full solutions, raise your doubts with your teacher.
Section A — Multiple Choice Questions
5 × 1 = 5 marks
1.
Which metal is placed just above hydrogen in the reactivity series?
- A.copper
- B.lead
- C.silver
- D.gold
2.
A metal that does NOT react with dilute acids is:
- A.zinc
- B.magnesium
- C.copper
- D.iron
3.
The number of electrons lost by magnesium when forming MgCl2 is:
- A.1
- B.2
- C.3
- D.0
4.
Ionic compounds are generally:
- A.gases
- B.liquids
- C.soft solids
- D.hard solids
5.
Which pair will undergo a displacement reaction?
- A.Cu + FeSO₄
- B.Ag + CuSO₄
- C.Zn + CuSO₄
- D.Au + ZnSO₄
Section B — Short Answer (2 marks)
3 × 2 = 6 marks
6.
Write the reaction of zinc with dilute sulphuric acid and name the gas evolved.
7.
State any two properties of ionic compounds.
8.
Why is the reaction of iron with copper sulphate a displacement reaction?
Section C — Short Answer (3 marks)
2 × 3 = 6 marks
9.
Explain the formation of sodium chloride by transfer of electrons, giving the electronic configurations of the ions.
10.
Why can a more reactive metal displace a less reactive metal from its salt solution? Give one example.
Section D — Long Answer (5 marks)
1 × 5 = 5 marks
11.
Write the reactivity series of common metals. Use it to explain (a) reaction with water, (b) reaction with dilute acids, and (c) a displacement reaction, with one example each.
Answer Key
Section A — Multiple Choice Questions
- (B) lead
- (C) copper
- (B) 2
- (D) hard solids
- (C) Zn + CuSO₄
Section B — Short Answer (2 marks)
- Zn + H₂SO₄ → ZnSO₄ + H₂; hydrogen gas is evolved.
- They are hard solids with high melting and boiling points; they are soluble in water and conduct electricity when molten or dissolved.
- Iron is more reactive than copper, so it displaces copper from its salt: Fe + CuSO₄ → FeSO₄ + Cu; the blue colour fades and copper is deposited.
Section C — Short Answer (3 marks)
- Na (2,8,1) loses one electron to form Na⁺ (2,8); Cl (2,8,7) gains it to form Cl⁻ (2,8,8). The oppositely charged ions attract strongly: 2Na + Cl₂ → 2NaCl, an ionic compound.
- A more reactive metal has a greater tendency to lose electrons (form ions), so it pushes the less reactive metal out of solution. Example: Zn + CuSO₄ → ZnSO₄ + Cu, where zinc displaces copper.
Section D — Long Answer (5 marks)
- Series: K > Na > Ca > Mg > Al > Zn > Fe > Pb > H > Cu > Hg > Ag > Au. (a) Water: K, Na, Ca react with cold water (2Na + 2H₂O → 2NaOH + H₂); Mg with hot water; Fe with steam; Cu/Ag/Au do not react. (b) Acids: metals above H displace H₂, e.g. Zn + 2HCl → ZnCl₂ + H₂; Cu (below H) does not. (c) Displacement: a metal higher in the series displaces one lower, e.g. Fe + CuSO₄ → FeSO₄ + Cu.
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