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Consecutive members of an alkane homologous serires differ by
ACH
BCH2
CCH3
DCnHn
ECnH
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Question 2032
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 2033
jamb1983
The alkanol obtained from the production of soap is
Aethanol
Bglycerol
Cmethanol
Dpropanol
Eglycol
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Question 2034
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
ANa 2CO 3
BNaHCO 3
CNaHSO 4
DNa 2SO 4
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Question 2035
jamb1982
1.00g of mixture of calcium carbonate and calcium oxide liberated 0.33g of carbon dioxide on strong heating. The percentage of calcium oxide in the mixture is? (Ca = 40, C = 12, O = 16)
A5
B15
C25
D35
E50
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Question 2036
jamb1982
The i.u.p.A.C name for the compound
A2-chloro-isopentane
B3-chloro-isopentane
C2-chloro-2-methylbutane
D1-chloro-2,2- dimethylpropane
E2-chloro-2-ethylpropane
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Question 2037
jamb1982
The solubility curve of a solid X (molecular mass = 160) is as show above. 1,000 cm3 of a saturated solution of X at 80°C is cooled to 40°C . The weight of X crystalized out would be
A10 g
B12 g
C14 g
D16 g
E18 g
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Question 2038
jamb1982
60cm3 of hydrogen are sparked with 20cm3 of oxygen at 100°C and 1 atmosphere. The total volume of the residual gases is?
A60 cm3
B10 cm3
C40 cm3
D30 cm3
E70 cm3
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Question 2039
jamb1982
The number of grammes of potassium hydroxide in 250cm3 of one molar solution is?
(K = 39, O = 16, H = 1)
A40g
B52g
C100g
D26g
E14g
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Question 2040
jamb1982
Brass is an alloy containing copper and?
Azinc
Btin
Caluminium
Dsilver
Elead
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Question 2041
jamb1982
Which of the following processes NOT lead to a chemical change?
AStrirring iron in sulphur (IV) acid
BStirring sodium carbonate in water
CStirring glucose in concentrated sulphur (IV) acid
DMixing sulphur (IV) acid with potassium carbonate
ETitrating an acid against base
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Question 2042
jamb1982
0.16g of methane when burnt raises the temperature of 100g of water by 40°C. What is the of combustion of methane when if the heat capacity of water is 4.2 Jg-1°C-1?
(CH4 = 16)
A1,160 kJ mol-1
B1,180 kJ mol-1
C1,560 kJ mol-1
D1,600kJ mol-1
E1,680 kJ mol-1
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Question 2043
jamb1982
Which of the following is NOT a redox reaction?
A2HNO2 + 2HI → 2H2O + 2NO + I2
BZn + H2SO4 → ZnSO4 + H2
CCa(HCO3)2 → CaCO3 + H2O + CO2
D4FeO + O2 → 2Fe2O3
E2Na + Cl2 → 2NaCl
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Question 2044
jamb1982
Which of the following combinations of conditions may increase the rate of a chemical reaction?
ADecrease in temperature, increase in concentration of the reactants
BIncrease in temperature, addition of a catalyst, decrease in the surface area of the reactants
CIncrease in temperature, increase in concentration, addition of a catalyst and increase in the surface area of the reactants
DDecrease in temperature concentration and surface area of the reactants
EAdditionof a catalyst and in the absence of light
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Question 2045
jamb1982
What weight of sodium hydroxide is required to make 500 cm\(^3\) of 0.2 M solution?
(Na = 23, O = 16, H = 1)
A40 g
B20 g
C10 g
D4 g
E2 g
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Question 2046
jamb1982
How many grams of methylacetylene (propyne) CH\(_3\) — C Ξ CH will completely discharge the colour of 8g of bromine?
(Br = 80, C = 12, H = 1)
A0.5
B1.0
C2.0
D3.0
E4.0
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Question 2047
jamb1982
Magnesium ribbon was added to each of the following aqueous solution in turn: H2SO4, AgNO3, HNO3, HCl, NH3, HCl, NH3. In which case does the magnesium become covered with a dark precipitate?
AH2SO4
BAgNO3
CHNO3
DNH3
EHCl
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Question 2048
jamb1982
When copper powder is heated with concentrated sulphuric acid, the gas produced is?
Ahydrogen sulphide
Bsulphur dioxide
Csulphur trioxide
Dhydrogen pentasulphide
Esulphur pentoxide
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Question 2049
jamb1982
In the preparation of carbon monoxide by heating ethanedioic acid with concentrated sulphuric acid, the concentrated sulphuric acid act as?
Aan oxidizing agent
Ba reducing agent
Ca dehydrating agent
Da reaction medium
Ea catalyst
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Question 2050
jamb1982
A current of 10.0A was passed for 1 hour through a solution of copper (ll) sulphate between the copper electrodes. Which of the following observation would be correct?
(1 Faraday = 96,500 coulombs) (i) 0.186 mole of copper is dissolved from the anode. (ii) 0.372 mole of copper is deposited on the cathode. (iii) the original Cu2+ ion concentration of the solution remains unchanged. (iv) the original Cu2+ ion concentration of the solution decreases.
