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Chemistry Past Questions

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135 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10

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Past Questions

135 questions

Question 1 of 20 135 total questions

Question 41

waec 2008

Which of the following statements is not true of halogens?

Athey exist in different physical states

Bthey exist as diatomic molecules

Ctheir ionic radii decrease down the group

Dtheir melting and bolling points increase down the group

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Question 42

waec 2008

Atom \(^{234} _{88} Q\) decay by alpha emission to give an atom R. The atomic number and mass number of atom R are respectively

A86 and 230

B87 and 234

C88 and 233

D90 and 238

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Question 43

waec 2008

What is the atomic number of an element whose cation Y⁺ has the electronic configuration 1s²2s²2p⁶?

B10

C11

D12

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Question 44

waec 2008

The valence electrons in a chloride ion are [₁₇CI]

A2p electrons only

B3s and 3p electrons only

C3p and 3d electrons only

D3p electrons only

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Question 45

waec 2008

Find the number of neutrons in an atom represented by 45₂₁X.

A21

B24

C45

D66

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Question 46

waec 2008

The mass spectrometer can be used to measure mass of

Aan atom

Ban electron

Ca proton

Da neutron

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Question 47

jamb 2008

Choose the correct option from the structure above

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Question 48

jamb 2008

Use the diagram to answer this question.The colour of the fountain water is

Ablue

Borange

Cred

Dyellow

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Question 49

jamb 2008

Use the diagram to answer this question. The gas that can be used to demonstrate the experiment is

Ahydrogen chloride

Bhydrogen sulphide

Cnitrogen(ll) oxide

Ddinitrogen (l) oxide

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Question 50

jamb 2008

Detergents are manufactured with straight hydrocarbon chains so as to make them

Asoluble

Bbiodegradable

Ccheaper

Dfoamy

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Question 51

jamb 2008

Polyvinyl chloride is used in the production of

Aglass

Balloy

Cpipes

Dceramics

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Question 52

jamb 2008

The product obtained when a mixture of benzene vapour and hydrogen are passed over nickel catalyst at 180ºC is

Acyclohexane

Bcyclopentane

Cn- hexane

Dn - pentane

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Question 53

jamb 2008

Reduction of alkanones with LialH4 produces

Aprimary alkanols

Bsecondary alkanols

Ctertiary alkanols

Dpolyhydric alkanols

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Question 54

jamb 2008

Reduction of nitroalkanes, nitrites and amides is a route for the preparation of

Aamines

Balkenes

Cpolymers

Ddetergents

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Question 55

jamb 2008

A red precipitate of copper (I) carbide is formed when ammonium solution of copper (I) chloride is introduced into

ACH₂ = CH - CH₂ - CH₃

BCH₃ CH₂ - C ≡ CH

CCH₃ CH₂ CH₂ CH₃

DCH₃ - C C - CH₃

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Question 56

jamb 2008

A hydrocarbon X with a molar mass of 26 consists of 92.3% carbon. What is its molecular formular?

AC₂H₂

BC₃H₃

CC₄H₄

DC₅H₅

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Question 57

jamb 2008

The IUPAC nomenclature for the structure above is

A2, 3 - dichloro - 4, 4, 5 - trimethyl pent - 2 - ene

B4, 5 - dichloro - 2, 3 - dimethyl hex - 2 - ene

C2, 3 - dichloro - 4, 4 - dimethyl hex - 2- ene

D2, 3 dichloro - 2, 2 - dimethyl hex - 2 - ene

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Question 58

jamb 2008

If glucose is heated with concentration tetraoxosulphate (VI) acid, it will be dehydrated to

Acarbon

Bcarbon (IV) oxide

Cethene

Dethanol

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Question 59

jamb 2008

If the silver mirror test is positive, it indicates the presence of an

Aalkyne

Balkanol

Calkanone

Dalkanal

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Question 60

jamb 2008

The type of isomerism shown by cis- and trans- isomers is

Aoptical isomerism

Bpositional isomerism

Cfunctional isomerism

Dgeometrical isomerism

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