Home / iGCSE Chemistry 0620 Extended – 8.2 Group I properties- Exam Style Questions Paper 2

iGCSE Chemistry 0620 Extended - 8.2 Group I properties- Exam Style Questions Paper 2- New Syllabus

iGCSE Chemistry MCQ (Extended) Paper 2 - All Chapters

Question

Some properties of element R are shown.

In which part of the Periodic Table is R found?

A. Group I
B. Group VII
C. Group VIII
D. transition elements

▶️ Answer/Explanation
Element R exhibits a noticeably low melting point for a metal ($98^\circ\text{C}$) and undergoes a violent displacement reaction with cold water to evolve hydrogen gas. These specific behavioral and physical properties identify R as an alkali metal belonging to Group I of the Periodic Table.
✅ Answer: (A)

Question

Which properties decrease down the group of alkali metals?

  1. melting point 
  2. density 
  3. reactivity

A. 1 and 2 
B. 1 only 
C. 2 and 3 
D. 3 only

▶️ Answer/Explanation

Correct Answer: B (1 only)

Explanation: Down Group I (alkali metals: Li, Na, K, Rb, Cs):
– Melting point: decreases (property 1 ✅ decreases).
– Density: generally increases (property 2 ❌ does not decrease).
– Reactivity: increases (property 3 ❌ does not decrease).

✅ Only melting point decreases down the group.

Question

Which statement about the elements in Group I is correct?

A. Hydrogen is produced when Group I elements react with water.
B. Ions of Group I elements have a 1- charge.
C. Sodium is more reactive than potassium.
D. Solid sodium is a poor electrical conductor.

▶️ Answer/Explanation
Group I elements react vigorously with water to produce the metal hydroxide and hydrogen gas. They form 1+ ions, not 1- (Group VII forms 1-). Reactivity increases down Group I, so potassium is more reactive than sodium. Sodium, like all Group I metals, conducts electricity.
✅ Answer: (A)
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