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.
The efficiency of petrol as a fuel in high-compression internal combustion engines improves with an increase in the amount of?
Abranched chain alkanes
Bstraight chain alkanes
Ccycloalkanes
Dhalogenated hydrocarbons
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Question 1032
jamb1987
Which of the following compounds will give a precipitate with an aqueous ammoniacal solution of copper (l) chloride?
ACH3 = CHCH3
BCH3 ≡ CCH3
CHC = C-CH2CH3
DCH2 = CH-CH = CH2
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Question 1033
jamb1987
Inspite of the electronic configuration, 1s22s22p2, carbon is tetraavalent because?
Athe electrons in both 2s and 2p orbitals have equal energy
Bthe electrons in both 2s and 2p orbitals are equivalent
Cboth the 2s and 2p orbitals hybridizes
Dthe six orbitals hybridize to four
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Question 1034
jamb1987
Corrosion is exhibited by?
Airon only
Belectropostive metals
Cmetals below hydrogen inthe electrochemical series
Dall metals
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Question 1035
jamb1987
Alloys are best prepared by?
Ahigh temperature weilding of the metals
Belectrolysis using the major metallic component as cathode
Creducing a mixture of the oxies of the elements
Dcooling a molten mixture of the necessary elements
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Question 1036
jamb1987
Stainless steel is an alloy of?
AIron, carbon and silver
Biron, carbon and lead
Ciron, carbon and chromium
Diron and carbon only
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Question 1037
jamb1987
Which of the following elements will form oxide which will dissolve both in dilute HNO3 and NaOH solutions to form salts?
AAl
BMg
CAg
DMn
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Question 1038
jamb1987
When sodium hydroxide is heated with ammonium tetraoxosulphate (IV), the gas given off may be collected by?
Abubbling it through concentrated H2SO2
Bbubbling it through water and then passing it through calcium oxide
Cpassing it directly through calcium oxide
Dpassing it directly through calcium chloride
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Question 1039
jamb1987
Which of the following gases can best be used for demonstrating the fountain experiment?
i) Nitrogen (ii) Ammonia (iii) Nitrogen (I) oxide
(iv) Hydrogen chloride.
Aii and iii
Bi and iii
Cii and iv
Dii only
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Question 1040
jamb1987
In which of the following pairs of element is allotropy exhibited by each element?
APhosphorus and hydrogen
BOxygen and chlorine
CSulphur and nitrogen
DOxygen and sulphur
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Question 1041
jamb1987
The best treatment for a student who accidentally poured concentrated tetraoxosulphate (VI) acid on his skin in the laboratory is to wash the skin with?
Acold water
Bsodium hydroxide solution
Ciodine solution
Dsodium trioxocarbonate (IV) solution
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Question 1042
jamb1987
Magnesium ribbon was allowed to burn inside a given gas P leaving a white solid residue Q. Addition of water to Q liberated a gas which produced dense white fumes with a drop of hydrochloric acid. The gas P was?
Anitrogen
Bchlorine
Coxygen
Dsulphur (IV) oxide
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Question 1043
jamb1987
The reaction between sulphur (IV) oxide and oxygen is represented by the equilibrium reaction 2SO2(g) + O2(g) ↔ 2SO3(g), ∆H = -196 kJ. What factor would influence increased production of SO3(g)?
AAddition of a suitable catalyst
BIncrease in the temperature of the reaction
CDecrease in the temperature of the reaction
DDecrease in the concentration of SO2(g)
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Question 1044
jamb1986
When 50cm3 of a saturated solution of sugar (molar mass 342.0g) at 40oC was evaporated to dryness, 34.2g of dry solid was obtained. The solubility of sugar at 40oC is
A10.0 moles dm-3
B7.0 moles dm-3
C3.5 moles dm-3
D2.0 moles dm-3
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Question 1045
jamb1986
Which of the following groups of physical properties increases from left to right of the periodic table?
i. Ionization energy ii. Atomic radius iii. Electronegativity iv. Electron affinity
Ai and ii
Bi, ii and iii
Ciii and iv
Di, iii and iv
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Question 1046
jamb1986
An element with atomic number twelve is likely to be
Aelectrovalent with a velocity of 1
Belectrovalent with a valency of 2
Ccovalent with a valency of 2
Dcovalent with valency of 4
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Question 1047
jamb1986
The relationship between the velocity (U) of gas molecules and their relative molecular mass (M) is shown by the equation
AU = (kM)\(\frac{1}{2}\)
BU = (kM)2
CU = \(\sqrt{\frac{k}{m}}\)
DU = \(\frac{k}{m}\)
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Question 1048
jamb1986
How much of magnesium is required to react with 260cm3 of 0.5 M HCl? [Mg = 24]
A0.3g
B1.5g
C2.4g
D3.0g
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Question 1049
jamb1986
The number of atoms of chlorine present in 5.85g of NaCl is [Avogadro's Number = 6.02 x 10\(^{23}\)]
A6.02 x 1022
B5.85 x 1023
C6.02 x 1023
D5.85 x 1024
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Question 1050
jamb1986
10cm3 of hydrogen fluoride gas react with 5cm3 of dinitrogen difluoride gas (N2F2) to form 103 of a single gas. Which of the following is the most likely equation of the reaction?
