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Chemistry Past Questions

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50 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10

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50 questions

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Question 21

jamb 1992

¹⁴₇N + X → ¹⁷₈O + ¹₁ H. In the above reaction, X is a?

Aneutron

Bhelium atom

Clitgium atom

Ddeuterium atom

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Question 22

jamb 1992

How many lone pairs of electron are there on the central atom of the H2O molecules?

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Question 23

jamb 1992

The nucleus of the isotope tritium, contains?

Atwo neutrons with no protons

Bone neutron and one protons

Ctwo neutrons and one proton

Dtwo neutrons, one proton and one electron

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Question 24

jamb 1992

An increase in temperature causes an increase in pressure of a gas in a fixed volume due to an increase in the?

Anumber of molecules of the gas

Bdensity of the gas molecules

Cnumber of collisions between the gas molecules

Dnumber of collisions between the gas molecules and the walls of the container

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Question 25

jamb 1992

If 100 cm³ of oxygen pass through a porous plug in 50 seconds, the time taken for the same volume of hydrogen to pass through the same porous plug is?

(O = 16, H = 1)

A10.0 s

B12.5 s

C17.7 s

D32.0 s

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Question 26

jamb 1992

Which of the following is a measure of the average kinetic energy of the molecules of a substance?

AVolume

BMass

Cpressure from age grades

DTemperature

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Question 27

jamb 1992

A given mass of gas occupies 2 dm³ at 300k. At what temperature will its volume be doubled keeping the pressure constant?

A400 k

B480 k

C550 k

D600 k

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Question 28

jamb 1992

wH₂SO₄ + xAI(OH)₃ → yH₂O + = zAI₂(SO₄)₃. The respective values of w.x.y and z in the equation above are?

A2,2,5 and 1

B3,2,5 and 2

C3,2,6 and 1

D2,2,6 and 2

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Question 29

jamb 1992

How many moles of (H+) are there in 1 dm³ of 0.5 M solution of H₂SO₄?

A2.0 moles

B1.0 moles

C0.5 mole

D0.25 mole

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Question 30

jamb 1992

There is a large temperature interval between the melting point and the boiling point of a metal because?

Ametals have very high melting points

Bmetals conduct heat very repaidly

Cmelting does not break the metalic bond but boiling does

Dthe crystal lattice of metals is easily broken

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