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The Periodic Table

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Question 1

Phosphorus is an element in Group 15 of the Periodic Table.

When phosphorus burns in oxygen, it forms phosphorus pentoxide.

a.

Describe two observations made when phosphorus burns in oxygen.

[2]
b.

Phosphorus pentoxide is

  • A an acidic oxide formed from a metal
  • B an acidic oxide formed from a non-metal
  • C a basic oxide formed from a metal
  • D a basic oxide formed from a non-metal
[1]
c.

The phosphorus pentoxide product is dissolved in water to form a solution, which is then tested with damp blue litmus paper.

(i) State the final colour of the litmus paper.

(ii) Identify the ion responsible for this colour.

[2]

The Periodic Table Questions

  1. IGCSE
  2. /Chemistry
  3. /The Periodic Table