CIE iGCSE Co-Ordinated Science C8.2 Group I properties Exam Style Questions Paper 1
Question
Which row about the trends in the elements going down Group I of the Periodic Table is correct?
▶️Answer/Explanation
Ans :C
Question
Which statement about sulfur is correct?
(A) It is a metallic element.
(B) It is used to make sulfuric acid.
(C) It is in Group VII of the Periodic Table.
(D) An atom of sulfur contains 32 electrons.
▶️Answer/Explanation
Ans : B
Question
The elements in Group I of the Periodic Table are metals.
What are the trends as the group is descended?
(A) decrease in melting point and less reactive with water
(B) decrease in melting point and more reactive with water
(C) increase in melting point and less reactive with water
(D) increase in melting point and more reactive with water
▶️Answer/Explanation
Ans: B
Question
Potassium is in Group I of the Periodic Table.
Which statement about potassium is correct?
(A) It is a relatively hard metal.
(B) It is less dense than lithium.
(C) It has a higher melting point than sodium.
(D) It reacts more vigorously with water than sodium.
▶️Answer/Explanation
Ans : D
Question
Which row describes trends in the properties of Group I elements as the group is descended?
| Melting point | Reactivity with water |
|---|---|
| A. decreasing | decreasing |
| B. decreasing | increasing |
| C. increasing | decreasing |
| D. increasing | increasing |
▶️Answer/Explanation
Answer: B
Explanation: As you go down Group I (alkali metals), the melting point decreases, and the reactivity with water increases. This is because the outer electron is further from the nucleus and less strongly attracted, making it easier to lose.
Question
Which row shows the trends for Group I elements lithium to potassium?
▶️Answer/Explanation
Answer: B) trend in melting point: decrease, trend in reaction with water: increase
Explanation: In Group I (alkali metals), melting points decrease down the group, and reactivity with water increases down the group. This is because the atoms become larger, and the outer electron is further from the nucleus, making it easier to lose.
Question
Which row describes properties of Group I elements?
| electrical conductivity | reaction with water | |
|---|---|---|
| A | conductor | does not react |
| B | insulator | reacts |
| C | conductor | reacts |
| D | insulator | does not react |
▶️Answer/Explanation
Answer: C. conductor, reacts
Explanation: Group I elements (alkali metals) are good conductors of electricity and react vigorously with water to produce hydrogen gas and an alkaline solution.