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Chemistry Past Questions

Study and practice Chemistry past questions with answers and detailed explanations. Then test your knowledge using our interactive CBT practice platform and prepare confidently for your upcoming examinations.

45 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10

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Past Questions

45 questions

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Question 21

waec 2000

The type of chemical bond that exists between potassium and oxygen in potassium oxide is

Aionic

Bmetallic

Ccovalent

Ddative

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Question 22

waec 2000

Electrovalent compounds are characterized by

Asolubility in ethanol

Bhigh molar mass

Chigh melting point

Dstrong oxidizing ability

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Question 23

waec 2000

An element Z has a combining power of 3. Which of the following formulae is correct of its compounds?

AZSO₃

BZ₃CI₂

CZ ₂O ₃

DZS₃

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Question 24

waec 2000

Chlorine atom forms \(Cl^{-}\) by

Alosing one electron

BSharing one electron

CDonating lone pair of electrons

DGaining one electron

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Question 25

waec 2000

The atoms of four elements are represented as 20Q, 16R, 10S and 8T Which of the elements would be unreactive?

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