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Chemistry Past Questions and Answers

Waec Chemistry Questions

Question 1391:

The mass of one mole of \((NH_{4})_{2}CO_{3}\) is [O=16.0, N=14.0, C=12.0, H=1.0]

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A 66.0g
B 76.0g
C 80.0g
D 96.0g

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Question 1392:

Atomic orbital is

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A The circular path through which electrons revolve round the nucleus
B A region around the nucleus where electrons are most likely to be found
C The path around the nucleus through which electrons move
D The path around the nucleus through which protons move

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Question 1393:

The property of elements which increases down a group of the periodic table is

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A Electronegativity
B Electron affinity
C Ionic radius
D Ionization energy

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Question 1394:

The reason for the decrease in the atomic size of elements across a period is that

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A Nuclear charge increases while the outermost electrons are drawn closer to the nucleus
B Nuclear charge decreases while the outermost electrons are drawn closer to the nucleus
C Valence electrons increase across the period while the valence shell remains constant
D Nuclear charge decreases while the distance of the valence shell from the nucleus is increasing

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Question 1395:

The oxidation number of nitrogen in \(Pb(NO_{3})_{2}\) is

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A +2
B +3
C +4
D +5

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