1990 JAMB UTME Chemistry Past Questions

1990

The solubility in mol dm-3 of 20g of CuSO4 dissolved in 100g of water at 180o is[Cu = 64, S = 32, O =16]

1990

In a reaction: SnO + 2C → Sn + 2CO, the mass of coke containing 80% carbon required to reduce 0.302 kg of pure tin oxide is?(Sn - 119, O - 16, C - 12).

1990

Which of the following is a physical change?

1990

Which of the following samples will react fastest with dilute trioxonitrate (V) acid?

1990

Iron galvanized with zinc is cathodically protected from corrosion. This is because?

1990

Fe2O3(s) + 2Al(s) → Al2O3 + 2Fe(s) If the heats of formation of Al2O3 and Fe2O3 are - 1670 kj mol-1 and - 822 kj mol-1 respectively, the enthalpy change in kj for the reaction is ?

1990

In the reaction 1O-3 + 5l- + 6H+ → 312 + 3H2O, the oxidizing agent is?

1990

Cr2O7 + 6Fe2+ + 14H+ → 2Cr3+ +6Fe3+ + 7H2O. In the above , the oxidation number of chromium changed from?

1990

In the Haber process for the manufacture of ammonia, the catalyst commonly used is finely divided ?

1990

Which of the following tests will completely identify anyone of surphur (VI) oxide, hydrogen, carbon (IV) oxide and nitrogen (II) oxide?

1990

The brown fumes given off when trioxonitrate (V) acid is heated consist of ?

1990

Which of the following gases can be collected by the upward displacement of air?

1990

In the reaction:2Hl(g) ↔ H2(g) + l2(g)' ΔH = 10 kj;The concentration of iodine in the equilibrium mixture can be increased by?

1990

Sodium hydrogen should be stored in properly closed containers because it?

1990

The major component of the slag from the production of iron is?

1990

Coal fire should not be used in poorly ventilated rooms because ?

1990

Which of the following metals will liberate hydrogen from steam or dilute acid?

1990

A metallic oxide which reacts with both HCl and NaOH to give salt and water only can be classified as?

1990

Alkaonic acids have low volatility compared with alkanols because they?

1990

The label on a reagent bottle containing a clear organic liquid dropped off.The liquid was neutral to litmus and gave a colourless gas with metallic sodium. The liquid must be an?

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