1991 JAMB UTME Chemistry Past Questions

1991

2H2S(g) + SO2(g) → 3S(s) + 2H2O(I). The above reaction is?

1991

MnO-4 + 8H+ + ne → Mn++ + 4H2O. Which is the value of n in the reaction above?

1991

Which of the following equimolar solutions, Na2CO3 Na2 SO4CI FeCI3 CH3COONa, Have pH greater than 7?

1991

If a current of 1.5 A is passed for 4.00 hours through a molten tin salt and 13.3g of tin is deposited, what is the oxidation state of the metal in the salt?(Sn = 118.7, F = 96500 C mol-1)

1991

What volume of CO2 at s.t.p would be obtained by reacting trioxocarbonate (IV) with excess acid?(G.M.V at s.t.p = 22.4 dm3)

1991

Which of the following gases will rekindle a brightly glowing splint?

1991

Which of the following equilibria is unaffected by a pressure change?

1991

NO(g) + CO(g) ↔ (1)/(2)N2(g) + CO2(g) ∆H = -89.3 kj. What conditions would favour maximum conversion of nitrogen (II) oxide and carbon (II) oxide in the reaction above?

1991

1.1 g of CaCI2 dissolved in 50 cm3 of water caused a rise in temperature of3.4°C. The heat of reaction, ∆H for CaCI2 in kj per mole is?(Ca = 40, CI = 35.5, specific heat of water is 4.18 jk-1

1991

Magnesium (IV) oxide is known to hasten the decomposition of hydrogen peroxide. Its main action is to?

1991

Which of the following metals can be prepared in samples by the thermal decomposition of their trioxonitrate (V) salts?

1991

Which of the following, in clear solution, forms a white precipitate when carbon (IV) oxide is bubbled into it for a short time?

1991

Addition of aqueous ammonia to a solution of Zn++ gives a white precipitate which dissolves in an excess of ammonia because?

1991

Oxygen gas can be prepared by heating?

1991

Which of the following salts can be melted without decomposition?

1991

One advantages of detergents over soap is that detergents?

1991

Ethene when passed into concentrated H2SO4 is rapidly absorbed. The product is diluted with water and then warmed to produce?

1991

How many grams of bromine will be required to completely react with 10 g of propyne?(C = 12, H = 1, Br = 80)

1991

Which of the following compounds can exist as geometric isomers?

1991

Copper (II) tetraoxosulphate (IV) is widely used as a?

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