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An increase in the pressure exerted on gas at a constant temperature results in
Aa decrease in the number of effective collisions
Ba decrease in volume
Can increase in the average intermolecular distance
Dan increase in volume
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Question 462
jamb2012
50 cm\(_3\) of gas was collected over water at 10ºC and 765 mm Hg. Calculate the volume of the gas at s.t.p. if the saturated vapour pressure of water at 10ºC is 5mm Hg
A49.19 cm 3
B48.87 cm 3
C48.55 cm 3
D48.23 cm 3
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Question 463
jamb2012
How many atoms are present in 6.0g of magnesium?
[Mg = 24, NA = 6.02 x 1023 mol-1]
A1.20 x 1022
B2.41 x 1022
C1.51 x 1023
D3.02 x 1023
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Question 464
jamb2012
Which of the following methods can be used to obtain pure water from a mixture of sand, water and methanoic acid?
Anetralization with NaOHfoolowed by filtration
Bneutralization with NaOH followed by distillation
Cfractional distillation
Dfiltration followed by distillation
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Question 465
jamb2011
The principle of column chromatography is based on the ability of the constituents to
Amove at different speeds in the column
Bdissolve in each other in the column
Creact with the solvent in the column
Dreact with each other in the column
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Question 466
jamb2011
choose the correct answer in the option above. Which of the following is a primary amine?
AA
BB
CC
DD
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Question 467
jamb2011
In the diagram above , X is the ``
Aenthalpy
Benthalpy change
Cactivation energy
Dactivated complex
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Question 468
jamb2011
with conc H2SO4 as catalyst
CH3COOH + C2H5OH → CH3COOC2H5 + H2O
Aesterification
BCondensation
Csaponification
Dneutralization
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Question 469
jamb2011
Which of the following statements is true about 2-methylpropane and butane
AThey are not members of the same homologous series
BThey have the same boiling point
CThey have different number of carbon atoms
DThey have the same chemical properties
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Question 470
jamb2011
Two organic compounds K and L were treated with a few drops of Fehling's solutions respectively . K formed a brick-red precipitate while L, remains unaffected. The compound K is an
Aalkanol
Balkane
Calkanal
Dalkanone
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Question 471
jamb2011
The functional groups present in the compound above are
Aalkene and halo-group
Bhydroxyl and chloro-group
Calkene and chloro-group
Dhydroxyl and halo-group
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Question 472
jamb2011
The number of isomers that can be obtained from C\(_4\)H\(_{10}\) is
A3
B4
C1
D2
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Question 473
jamb2011
At 25o and zymase as catalyst,
C6H126 → 2C2H5OH + 2CO2 + energy
The reaction above represented by the equation above is useful in the production of
Apropanol
Bbutanol
Cmethanol
Dethanol
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Question 474
jamb2011
An organic compound has an empirical formula CH2O and vapour density of 45.
What is the molecular formula?
[C = 12, H = 1, O = 16]
AC3H7OH
BC2H5OH
CC3H6O3
DC2H4O2
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Question 475
jamb2011
Which of the following compounds will undergo polymerization reaction?
AC2H4
BC2H5COOH
CC2H6
DC2H5OH
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Question 476
jamb2011
The ability of carbon to form long chains is referred to as
Aalkylation
Bacylation
Ccatenation
Dcarbonation
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Question 477
jamb2011
The constituents of baking powder that makes the dough to rise is
ANaHCO3
BNaOH
CNa2CO3
DNaCl
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Question 478
jamb2011
Bronze is preferred to copper in the making of medals because it
Ais stronger
Bcan withstand low temperature
Cis lighter
Dhas low tensile strength
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Question 479
jamb2011
The property of concentrated H2SO4 that makes it suitable for preparing HNO3 is its
Aboiling point
Bdensity
Coxidizing properties
Ddehydrating properties
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Question 480
jamb2011
In the laboratory preparation of oxygen, dried oxygen is usually collected over
