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IGCSE A Level Chemistry Competitive Exam MCQs – Practice Test 5 (Chapter 22)

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Free "IGCSE A Level Chemistry Learning" App Download with MCQ: Lowest relative melting point among the four oxides is of; with answers: so3, so2 (g), and p4o10. Solve Rate of Reaction Quiz Questions, download Google e-Book (Free Chapter) to improve university preparation.

Periodicity MCQs with Answers PDF Download: MCQ Quiz 5

MCQ 21: The lowest relative melting point among the four oxides is of:

  1. SO2 (g)
  2. SO3
  3. P4O10
  4. all of above

MCQ 22: The element in Period 3 with the lowest electronegativity is:

  1. Na
  2. Al
  3. P
  4. S

MCQ 23: When phosphorus reacts with oxygen, it gives off clouds of:

  1. white color
  2. phosphorus oxide only
  3. phosphorus dioxide
  4. white color and phosphorus oxide

MCQ 24: If heated Mg(s) is allowed to react with H2O(l), the product formed other than H2(g) will be:

  1. MgO(s)
  2. MgO(aq)
  3. Mg(OH)2 (aq)
  4. Mg2O3(s)

MCQ 25: Among period 3 elements, an element which has a higher electronegativity than others is:

  1. chlorine
  2. argon
  3. sulfuric acid
  4. silicon

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