1997 JAMB UTME Chemistry Past Questions

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1997

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?

1997

35 cm3 of hydrogen was sparked with 12 cm3 of oxygen at 110°C and 760mm Hg to produce steam. What percentage of the total volume of gas left after the reaction is hydrogen?

1997

In the periodic table, what is the property that decreases along the periodic and increases down the group?

1997

The electron configuration of two elements with similar chemical properties are represented by?

1997

The temperature of a body decreases when drops of liquid placed on it evaporate because?

1997

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?

1997

An element, X, forms a volatile hydride XH3 with a vapour density of 17.0. The relative atomic mass of X is?(H = 1)

1997

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)

1997

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?

1997

If 30cm3 of oxygen diffuses through porous plug in 7s, how long will it take 60 cm3 of chlorine to diffuse through the same plug?

1997

Oxygen is a mixture of two isotopes O and O with relative abundances of 90% and 10% respectively. The relative atomic mass of oxygen is?

1997

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?

1997

Which of the aqueous solutions with the pH values below will liberate hydrogen when it react with magnesium metals?

1997

The hydroxyl ion concentrated, (OH-), in a solution of sodium hydroxide of pH 10.0 is?

1997

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?

1997

A major process involved in the softening of hard water is the?

1997

Which of the following gases is the most dangerous pollutant?

1997

2H2S(g) + SO2(g) + H2O(l) → 3S(s) + 3H2O(l)..........(I)3CuO(s) + 2NH3(g) → 3Cu(s) + 3H2O(l) + N2(g).........(II)In the equations above, the oxidizing agent (I) and the reducing agent in (II) respectively are?

1997

What is the oxidation number of Z in K3ZCl6?

1997

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-)

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