1991 JAMB UTME Chemistry Past Questions

1991

30cm3 of oxygen at 10 atmospheres pressure is placed in a 20 dm3 container. Calculate the new pressure if temperature is kept constant?

1991

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…

1991

An iron ore is known to contain 70.0% Fe2O3. The obtain from 80kg of the ore is?(Fe = 56, O = 16)

1991

Which of the following are mixtures?i. Petroleum ii. Rubber latex iii. Vulcanizer's solution iv. Carbon (II) sulphide

1991

Which of the following can be obtained by fractional distillation?

1991

The electronic configuration of an elements is 1s22s22p63s23p3. How many unpaired electrons are there in the element?

1991

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

1991

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)

1991

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?

1991

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)

1991

Which of the following ions is a pollutant in drinking water even in trace amounts?

1991

A quantity of air was passed through a weighed amount of alkaline pyrogallol. An increase in the weight of the pyrogallol would result from the absorption of?

1991

Which of the following is arranged in order of increasing electronegativity?

1991

Which of the following represents the type of bonding present in ammonium chloride molecule?

1991

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?

1991

How many structural isomers can be written for the alkyl bromide, C4H9Br?

1991

50 cm3 of sulphur (IV) oxide, 800 cm3 of ammonia, 450 cm3 of hydrogen chloride, 1.0 cm3 of at 15°C. Which of the following is suitable for demonstrating the fountain experiment?

1991

A property of a colloidal dispersion which a solution does not have is?

1991

A sample of temporary hard water can be prepared in the laboratory by?

1991

The solubility of copper (II) tetraoxosulphate (Iv) is 75g in 100g of water at 100°C and 25g in 100g of water at 30°C. What mass of the salt would crystallize, if 50g of copper (II) tetraoxosulphate (VI) solution saturat…

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