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Chemistry Past Questions and Answers

Waec Chemistry Questions

Question 1481:

Atoms are electrically neutral because they

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A Do not conduct electricity
B Contain equal number of protons and electrons
C Are composed of neutrons and electrons
D Cannot be attracted by electromagnetic field.

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Question 1482:

Common Salt (NaCl) is used to preserve foods. Which of the following properties can be used to determine its purity before use?

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A Solubility in water
B Melting point
C Relative density
D Crystalline nature

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Question 1483:

Which of the following electron configurations represents the transition element Chromium \(_{24}Cr\)?

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A \(1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{2} 3d^{4}\)
B \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{6}\)
C \(1s^{2}2s^{2}2p^{6}3s^{2}3d^{4} 4s^{1}\)
D \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1}3d^{5}\)

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Question 1484:

The atomic number of an isotope of hydrogen is equal to its mass number because it

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A Has a totally filled valence shell
B Has a high charge to mass ratio
C Does not contain neutrons
D Exhibits isotopy

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Question 1485:

What is the total number of shared pair of electrons in the compound above?

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A 5
B 8
C 10
D 12

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