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An unknown organic compound X has a relative molecular mass of 180. It is a colourless crystaline solid, readily soluble in water. X contains the elements C, H and O in the atomic ratio 1: 2:1. The compound has a sweet teste and melts on heating. In the presence of yeast and in the absence of air, X is converted to compound Y and a colourless gas. Compound Y reacts with sodium metal to produce a gas Z which gives a 'pop' sound with a glowing splint. Y also reacts with ethanoic acid to give a sweet smelling compound W.
Reaction of X with yeast forms the basis of the
Aplastic industry
Btextile industry
Cbrewing industry
Dsoap industry
Edyeing industry
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Question 22
jamb1983
An unknown organic compound X has a relative molecular mass of 180. It is a colourless crystaline solid, readily soluble in water. X contains the elements C, H and O in the atomic ratio 1: 2:1. The compound has a sweet teste and melts on heating. In the presence of yeast and in the absence of air, X is converted to compound Y and a colourless gas. Compound Y reacts with sodium metal to produce a gas Z which gives a 'pop' sound with a glowing splint. Y also reacts with ethanoic acid to give a sweet smelling compound W.
The molecular formula of X is
AC12H22O11
BC6H12O6
CC3H6O 3
DC7H14O7
EC12H6O4
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Question 23
jamb1983
An unknown organic compound X has a relative molecular mass of 180. It is a colourless crystaline solid, readily soluble in water. X contains the elements C, H and O in the atomic ratio 1: 2:1. The compound has a sweet teste and melts on heating. In the presence of yeast and in the absence of air, X is converted to compound Y and a colourless gas. Compound Y reacts with sodium metal to produce a gas Z which gives a 'pop' sound with a glowing splint. Y also reacts with ethanoic acid to give a sweet smelling compound W.
Compound W is
Aa soap
Ban oil
Can alkane
Dan ester
Esucrose
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Question 24
jamb1983
The three-dimensional shape of methane is
Ahexagonal
Btrigonal
Clinear
Dtetrahedral
Ecubical
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Question 25
jamb1983
Some copper (ll) sulphate pentahydrate (CuSO4 5H2O), was heated at 120 oC with the following results. Wt of crucible = 10.00 g; Wt of crucible + CuSO4 5H2O =14.98g; Wt of crucible + residue = 13.54 g. How many molecules of water of crystalization were lost?
[H = 1, Cu = 63.5, O = 16, S = 32]
A1
B2
C3
D4
E5
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Question 26
jamb1983
If an element has the electronic configuration 1s 2 2s2 2p3 3s2 3p4, it is
Aa metal
Ban alkaline earth metal
Can s-block element
Da p-Block element
Ea transition element
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Question 27
jamb1983
Consecutive members of an alkane homologous serires differ by
ACH
BCH2
CCH3
DCnHn
ECnH
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Question 28
jamb1983
The flame used by welders in cutting metals is
Abutane gas flame
Bacetylene flame
Ckerosene flame
Doxy-acetylene flame
Eoxygen flame
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Question 29
jamb1983
The alkanol obtained from the production of soap is
Aethanol
Bglycerol
Cmethanol
Dpropanol
Eglycol
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Question 30
jamb1983
X is a crystalline salt of sodium solution of X in water turns litmus red and produces a gas which turns lime water milky when added to sodium carbonate. With barium chloride solution, X gives hydrochloric acid. X is
