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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.

90 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10

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90 questions

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Question 41

jamb 2014

A silicon -containing ore has 92% 28Si, 5% 29Si and 3% 30Si. Calculate the relative atomic mass of the silicon.

A14.00

B29.00

C28.11

D28.00

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Question 42

jamb 2014

The radio active radiation used in studying the arrangement of particles in giant organic molecules is

A\(\gamma\)- rays

B\(\alpha\)- particles

CX-rays

D\(\beta\) - particles

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Question 43

jamb 2014

How many protons, neutrons and electrons respectively are present in the element 60/27 Co?

A27, 33 and 33

B33, 27 and 27

C27, 33, and 27

D60, 33 and 60

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Question 44

jamb 2014

If the difference in electronegativity of elements P and Q is 3.0. The bond that will be formed between them is

Ametallic

Bcovalent

Cco-ordinate

Dionic

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Question 45

jamb 2014

Beryllium and aluminum have similar properties because they?

Aare both metals

Bbelong to the same group

Cbelong to the same period

Dare positioned diagonally to each other

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Question 46

jamb 2014

An element X has electron configuration 1s² 2s² 2p⁶ 3s² 3p⁵. Which of the following statements is correct about the element?

Alt has a completely filled p-orbital

Blt has 5 electrons in its outermost shell.

Clt belongs to group ll on the periodic table

Dlt is a halogen

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Question 47

jamb 2014

200 cm3 of a gas at 25ºC exerts a pressure of 700 mmHg. Calculate its pressure if its volume increase 350 cm3 at 75ºC.

A342.53 mmHg

B1430.54 mmHg

C467.11 mmHg

D400.00 mmHg

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Question 48

jamb 2014

A gas X diffuses twice as fast as gas Y. if the relative molecular mass of X is 32, calculate the relative molecular mass of Y.

A128

C16

D64

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Question 49

jamb 2014

What is the percentage of sulphur in sulphur (IV) oxide?

A66%

B25%

C40%

D50%

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Question 50

jamb 2014

A mixture is different from a compound because

Athe properties of a compound are those of its individual constituents while those of a mixture differ from its constituents

Ba mixture is always homogeneous while a compound is not

Cthe constituent of a compound are chemically bound together while those of a mixture are not

Da mixture can be represented by a chemical formula while a compound cannot

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