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.
If a gas occupies a container of volume 146 cm3 at 18°C and 0.971 atm, its volume in cm3 at s.t.p is?
A133
B146
C266
D292
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Question 962
jamb1990
Which of the following is formed when maltose reacts with concentrated tetraoxosulphate (VI) acid ?
ACarbon (IV) oxide
BCoal tar
CCharcoal
DToxic fumes
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Question 963
jamb1990
The octane number of a fuel whose performance is the same as that of a mixture of 55 g of 2,2,4- trimethly pentane and 45 g of n-heptane is ?
A45
B55
C80
D100
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Question 964
jamb1990
Alkaonic acids have low volatility compared with alkanols because they?
Aare more polar than alkaonls
Bhave two oxygen atoms while alkanols have one
Cform hydrogen bonds while alkanols do not
Dform two hydrogen bonds while alkanols form one
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Question 965
jamb1990
The label on a reagent bottle containing a clear organic liquid dropped off.The liquid was neutral to litmus and gave a colourless gas with metallic sodium. The liquid must be an?
Aalkanoate
Balkaene
Calkanol
Dalkane
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Question 966
jamb1990
A cycloalkane with the molecular formula C5H10 has ?
Aone isomer
Btwo isomers
Cthree isomers
Dfour isomers
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Question 967
jamb1990
Which of the following compounds gives a yellow residue when heated and also reacts with aqueous sodium hydroxide to give a white gelatinous precipitate soluble in excess sodium hydroxide solution?
A(NH4)CO3
BZnCO3
CAl2(SO4)3
DPbCO3
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Question 968
jamb1990
To make coloured glasses, small quantities of oxides of metals which form coloured silicates are often added to the reaction mixture consisting of Na2CO3 and SiO2. Such a metals is a?.
Apottasium
Bbarium
Czinc
Dcopper
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Question 969
jamb1990
Sodium hydroxide should be stored in properly closed containers because it?
Areadily asborbs water vapour to air
Bis easily oxidize by atmospheric oxygen
Cturns golden yellow when exposed to light
Dmelts at a low temperature
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Question 970
jamb1990
The major component of the slag from the production of iron is?
Aan alloy of calcium and iron
Bcoke
Cimpure iron
Dcalcium trioxosilicate (IV)
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Question 971
jamb1990
Coal fire should not be used in poorly ventilated rooms because ?
Aof the accumulation of CO2 which causes dep sleep
Bit is usually too hot
Cof the acumulation of CO which causes suffocation
Dit removes most most of the gases in the rooms
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Question 972
jamb1990
Which of the following metals will liberate hydrogen from steam or dilute acid?
ACopper
BIron
CLead
DMercury
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Question 973
jamb1990
A metallic oxide which reacts with both HCl and NaOH to give salt and water only can be classified as?
Aan acidic oxide
Ba basic oxide
Ca neutral oxide
Dan amphoteric oxide
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Question 974
jamb1990
In the Haber process for the manufacture of ammonia, the catalyst commonly used is finely divided ?
Avanadium
Bplatinum
Ciron
Dcopper
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Question 975
jamb1990
Which of the following tests will completely identify anyone of surphur (VI) oxide, hydrogen, carbon (IV) oxide and nitrogen (II) oxide?
APass each gas into water and test with blue litmus paper
BPass each gas into lime water
CExpose each gas to atmospheric air
DPass each gas to concentrated tetraoxosulphate (IV) acid
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Question 976
jamb1990
The brown fumes given off when trioxonitrate (V) acid is heated consist of ?
ANO2 and O2
BH2O and NO2
CNO2' O2 and H2O
DNO, NO2 and H2O
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Question 977
jamb1990
Which of the following gases can be collected by the upward displacement of air?
ANO
BH 2
CNH3
DCl 2
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Question 978
jamb1990
In the reaction:
2Hl(g) ↔ H2(g) + l2(g)' ΔH = 10 kj;
The concentration of iodine in the equilibrium mixture can be increased by?
Araising the pressure
Braising the temperature
Cadding a catalyst
Dlowering the pressure
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Question 979
jamb1990
Which of the following samples will react fastest with dilute trioxonitrate (V) acid?
A5 g of lumps of CacO3 at 25°C
B5 g of powered CacO3 at 25°
C5 g of lumps of CaCO3 at 50°C
D5 g of powered CaCO3 AT 50°C
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Question 980
jamb1990
Iron galvanized with zinc is cathodically protected from corrosion. This is because?
Azinc has a more positive oxidation potential than iron
Bzinc has less positive oxidation potential than iron
