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Which of the following represents the type of bonding present in ammonium chloride molecule?
AIonic only
BCovalent only
CIonic and dative covalent
DDative covalent only
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Question 1793
jamb1991
The ions X- and Y+ are isoelectronic, each containing a total of 10 electrons.
How many protons are in the nuclei of the neutral atoms of X and Y respectively?
A10 and 10
B9 and 9
C11 and 9
D9 and 11
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Question 1794
jamb1991
The electronic configuration of an elements is 1s22s22p63s23p3. How many unpaired electrons are there in the element?
A5
B4
C3
D2
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Question 1795
jamb1991
Atoms of element X (with 2 electrons in the outer shell). combine with atoms of Y (with 7 electrons in the outer shell). Which of the following statements is FALSE? The compound formed?
Ahas formula XY
Bis likely to be ionic
Ccontains X2+ ions
Dcontains Y- ions
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Question 1796
jamb1991
A sample of a gas exerts a pressure of 8.2 atm when confined in a 2.93 dm3 container at 20°C. The number of moles of gas in the sample is?
(R = 0.082 litre atm / deg mole)
A1.00
B2.00
C3.00
D4.00
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Question 1797
jamb1991
A given quantity of a gas occupies a volume of 228 cm3 at a pressure of 750mm Hg. What will be its volume at atmospheric pressure?
A220 cm3
B225 cm3
C230 cm3
D235 cm3
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Question 1798
jamb1991
Calculate the volume of carbon (IV)oxide measured at s.t.p, produced when 1 kg of potassium hydrogen trioxocarbonate (IV) is totally decomposed by heat?
(G.M.V. at s.t.p 22.4 dm3, K = 39, O = 16, C = 12, H = 1)
A28 dm3
B56 dm3
C112 dm3
D196 dm3
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Question 1799
jamb1991
30cm\(^3\) of oxygen at 10 atmospheres pressure is placed in a 20 cm\(^3\) container. Calculate the new pressure if temperature is kept constant?
A6.7 atm
B15.0 atm
C60.0 atm
D66. 0 atm
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Question 1800
jamb1991
In two separate experiments, 0.36g and 0.71g of chlorine combined with a metal X to give Y and Z respectively. An analysis showed that Y and Z contain 0.20g and 0.40g of X respectively. The data above represents the law of ?
Amultiple proportion
Bconservation of mass
Cconstant composition
Dreciprocal proportion
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Question 1801
jamb1991
An iron ore is known to contain 70.0% Fe2O3. The obtain from 80kg of the ore is?
(Fe = 56, O = 16)
A35.0 kg
B39.2 kg
C70.0 kg
D78.4 kg
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Question 1802
jamb1991
Which of the following are mixtures?
i, Petroleum
ii, Rubber latex
iii. Vulcanizer's solution
iv, Carbon (II)sulphide
Ai, ii and iii
Bi, ii and iv
Ci and ii only
Di and iv
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Question 1803
jamb1991
Which of the following can be obtained by fractional distillation?
ANitrogen from liquid air
BSodium chloride from sea water
CIodine from a solution of Iondine in carbon tetrachloride
DSulphur from a solution of sulphur incarbon disulphide
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Question 1804
waec1990
Petrol can be obtained from diesel by
Adistillation
Bcracking
Ccatalysis
Dpolymerization
Edehydrogenation
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Question 1805
waec1990
The following metals are extracted by the electrolytic method except
Apotassium
Bcalcium
Csodium
Dtin
Emagnesium
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Question 1806
waec1990
Which of the following compounds crystallizes without water of crystallization?
ANa2CO3
BCuSO4
CMgSO4
DNaCI
EFeSO4
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Question 1807
waec1990
The decomposition of hydrogen peroxide is represented by the equation: 2H2O(l) + O2(g) what mass of hydrogen peroxide would be required to produce 22.4dm3 of oxygen at s.t.p? (H = 1, O = 16, molar volume of a gas at s.t.p. = 22.4dm3)
A18 g
B34 g
C36 g
D64 g
E68 g
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Question 1808
waec1990
Nuclear reactions can be used in the following except
Agauging the thickness of objects
Bmaking atomic bombs
Ccuring cancer
Dgenerating electricity
Epurifying water
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Question 1809
waec1990
Which of the following is normally used for drying ammonia gas?
AConcentrated tetraoxonitrate (Vl) acid
BCalcium oxide
Canhydrous calcium chloride
Dphosphorus (V) oxide
Eanhydrous copper (ll) tetraoxosulphate (VI)
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Question 1810
waec1990
Which of the following explains why trioxonitrate (V) acid is not used for preparing hydrogen from metals?
