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How many Faraday of electricity are required to deposit 0.20 mole of nickel, if 0.10 Faraday of electricity deposited 2.98g of nickel during electrolysis of its aqueous solution?
(Ni = 58.7, 1F = 96 500 C mol-)
A0.20
B0.30
C0.40
D0.50
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Question 1563
jamb1997
When platinum electrodes are used during the electrolysis of copper (ll) tetraoxosulphate (lV) solution, the solution gets progressively?
Aacidic
Bbasic
Cneutral
Damphoteric
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Question 1564
jamb1997
Given that 15.00 cm3 of H2
SO4 was required to completely neutralize 25.00 cm3 of 0.125 mol dm-3 NaOH, calculate the molar concentration of the acid solution:
A0.925 mol dm-3
B0.156mol dm-3
C0.104 mol dm-3
D0.023 mol dm-3
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Question 1565
jamb1997
Which of the aqueous solutions with the pH values below will liberate hydrogen when it react with magnesium metals?
A13.0
B7.0
C6.5
D3.0
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Question 1566
jamb1997
The hydroxyl ion concentrated, (OH-), in a solution of sodium hydroxide of pH 10.0 is?
A10-10 mol dm-3
B10-6 mol dm-3
C10-4 mol dm-3
D10-2 mol dm-3
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Question 1567
jamb1997
A saturated solution of AgCl was found to have a concentration of 1.30 x 10-5 mol dm-3. The solubility product of AgCl therefore is?
A1.30 x 10-5 mol2 dm-6
B1.30 x 10-7 mol2 dm-6
C1.69 x 10-10 mol2 dm-6
D2.60 x 10-12 mol2 dm-6
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Question 1568
jamb1997
A major process involved in the softening of hard water is the?
Aconversion of a soluble calcium salt to its trioxoncarbonate (lV)
Bdecomposition of calcium trioxocarbonate (lV)
Cconversion of an insoluble calcium salts to its trioxocarbonate (lV)
Doxidation of calcium atoms to its ions
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Question 1569
jamb1997
Which of the following gases is the most dangerous pollutant?
AHydrogen sulphide
BCarbon (lV) oxide
CSulphur (lV) oxide
DCarbon (ll) oxide
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Question 1570
jamb1997
On recrystallization, 20g of magnesium tetraoxosuphate (IV) forms 41 g of magnesium tetraoxosulphate (IV) crystals, MgSO4. yH2O. The value of y is?
(Mg = 24, S = 32, O = 16, H = 1)
A1
B3
C5
D7
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Question 1571
jamb1997
200 cm3 of air was passed over heated copper in a syringe several times to produce copper (II) oxide.
When cooled, the final volume of air recorded was 158cm3. Estimate the percentage of oxygen in the air?
A31%
B27%
C21%
D19%
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Question 1572
jamb1997
If 30cm\(^3\) of oxygen diffuses through porous plug in 7s, how long will it take 60 cm\(^3\) of chlorine to diffuse through the same plug?
A12s
B14s
C21s
D30s
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Question 1573
jamb1997
Oxygen is a mixture of two isotopes 16-O and 18-O with relative abundances of 90% and 10% respectively. The relative atomic mass of oxygen is?
A16.0
B16.2
C17.0
D18.0
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Question 1574
jamb1997
Two elements, P and Q with atomic numbers 11 and 8 respectively , combine chemically to form the compound PxQY. The respective values of x and y are?
A1 and 1
B1 and 2
C2 and 1
D3 and 1
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Question 1575
jamb1997
In the periodic table, what is the property that decreases along the periodic and increases down the group?
AAtomic number
BElectron affinity
CIonization potential
DAtomic radius
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Question 1576
jamb1997
The electron configuration of two elements with similar chemical properties are represented by?
A1s22s22p5 and 1s22s22p4
B1s22s22p4 and 1s22s22p63s1
C1s22s22p63s1 and 1s22s1
D1s22s22p4 and 1s22s1
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Question 1577
jamb1997
The temperature of a body decreases when drops of liquid placed on it evaporate because?
Athe atmospheric vapour pressure has a cooling effect on the body
Ba temperature gradient exists between the drops of liquid and the body causing the latter to vaporate
Cthe heat of vapourization is drawn from the body causing it to cool
Dthe random motion of the liquid molecules causes a cooling effect on the body
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Question 1578
jamb1997
A mixture of 0.20 mole of Ar, 0.20 mole of N2 and 0.30 mole of He exerts a total pressure of 2.1 atm. The partial pressure of He in the mixture is?
A0.90 atm
B0.80 atm
C0.70 atm
D0.60 atm
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Question 1579
jamb1997
An element, X, forms a volatile hydride XH3 with a vapour density of 17.0. The relative atomic mass of X is?
(H = 1)
A34.0
B31.0
C20.0
D14.0
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Question 1580
jamb1997
2.85g of an oxide of copper gave 2.52g of copper on reduction and 1.90g of another oxide gave 1.52g of copper on reduction. The data above illustrates the law of?
