Chemistry Past Questions

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87 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10
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Past Questions

87 questions
Question 1 of 20 87 total questions
Question 21
jamb 1992

In the experiment above. Z can be

Aa solution of sodium dioxonitrate (lll) and ammonium chloride
Ba solution of lead trioxnitrate (V)
Ca solution of sodium trioxonitrate (V) and ammonium chloride
Dconcentrated tetraoxosulphate (VI) acid and sodium trioxonitrate (V)
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Question 22
jamb 1992
An example of a polysaccharides is?
A—dextrose
Bmannose
Cglucose
Dstarch
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Question 23
jamb 1992
Alkanals can be differentiated from alkanones by reaction with?
A2,4-dinitrophenylhydrazine
Bhydrogen cyanide
Csodium hydrogen sulphite
DTollen's reagent
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Question 24
jamb 1992
The characteristics reaction of carbonyl compounds is?
Asubstitution
Belimination
Caddition
Dsaponfication
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Question 25
jamb 1992
An organic compound containing 40.1% carbon and 6.6% hydrogen has an empirical formula of?
AC2H4O2
BC2H3O2
CCH2O
DCH3O
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Question 26
jamb 1992
The functional group present in an organic compound which gives bubbles on treatment with a saturated solution of NaHCO3 is?
Ahydroxyl group
Bcarboalkoxyl group
Ccarbonyl group
Dcarboxyl group
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Question 27
jamb 1992
Which of the following are isomers?
AEthanol and dimethyl ether
BBenzene and methybenzene
CEthanol and propanone
DTrichloromethane and tetrachloromethane
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Question 28
jamb 1992

Which of the following compounds reacts with sodium metal as well as silver and copper salts ?

ACH3C Ξ C—CH3
BCH3CH2CH2
CCH3C Ξ CH
DCH3CH = CH CH3
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Question 29
jamb 1992

The carbon atoms in ethene are?

Asp3 hybridized
Bsp hybridized
Csp2 hybridized
Dnot hybridized
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Question 30
jamb 1992
CaOs + H2O(l) → Ca(OH)2(s) ΔH -65 kj. The process represented by the above equation is known as?
Adissolution
Bslaking
Climing
Dmortaring
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Question 31
jamb 1992
Duralumin consists of aluminium, copper, ?
Azinc and gold
Blead and maganese
Cnickle and silver
Dmanganese and magnesium
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Question 32
jamb 1992
Which of the following is NOT used as a raw material in the Solvay process?
AAmmonia
BSodium chloride
CCalcium trioxocarbonate (IV)
DSodium trioxocarbonate (IV)
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Question 33
jamb 1992

Sodium hydroxide solution can be conveniently stored in a container made of?

Alead
Bzinc
Caluminium
Dcopper
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Question 34
jamb 1992
Addition of an aqueous solution of a salt gives a white precipitate. The salt is likely to be a?
Anitrate
Bcarbonate
Cchloride
Dsulphide
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Question 35
jamb 1992

Safety matches contain sulphur and the following except?

Asodium chloride
Bpotassium trioxonitrate (V)
Ccharcoal
Dphosphorus sulphide
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Question 36
jamb 1992

The gas formed when ammonium trioxonitrate (V) is heated with sodium hydroxide is?

Ahydrogen
Bnitrogen (IV) oxide
Coxygen
Dammonia
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Question 37
jamb 1992
The gas formed when ammonium trioxonitrate (V) is heated with sodium hydroxide is?
Ahydrogen
Bnitrogen (IV) oxide
Coxygen
Dammonium
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Question 38
jamb 1992
Which of the following oxides of nitrogen is unstable in air?
ANO2
BNO
CN2O4
DN2O5-
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Question 39
jamb 1992

Which of the following combination of gases is used for metal welding? i. Oxygen and ethyne, ii. Hydrogen and ethyne, iii. Hydrogen and oxygen, iv. Ethyne, hydrogen and oxygen.

Ai and ii
Bii and iv
Ci and iii
Dii and iv
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Question 40
jamb 1992

Which of these statements is TRUE about carbon (IV) oxide?

Ait supports combustion
BIt is strongly acidic in water
CIt is very soluble in water
DIt supports the buring of magnesium to produce magnesium oxide
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