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JAMB UTME - Chemistry - 2022

Question 1 Report

When marble is heated to 1473K, another whiter solid is obtained which reacts vigoriously with water to give an alkaline solution. The solution contains

NaOH

KOH

Mg(OH)2

Ca(OH)2

Answer Details

The white solid obtained when marble (calcium carbonate, CaCO3) is heated to 1473K is calcium oxide (CaO), also known as quicklime. When quicklime reacts vigorously with water, it forms calcium hydroxide (Ca(OH)2), which is an alkaline solution. Therefore, the solution obtained from the reaction of quicklime with water contains calcium hydroxide (Ca(OH)2).

Read lesson note on Periodic Chemistry (Ghana Only) (WAEC)

Periodic Chemistry (Ghana Only)

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Question 8 Report

An organic compound which liberate carbon(iv)oxide from trioxocarbonate(iv) solution is likely to be?

C

_{2}

H

_{5}

OH

C

_{3}

H

_{4}

C

_{6}

H

_{6}

CH

_{3}

COOH

Answer Details

The organic compound that liberates carbon(iv)oxide from trioxocarbonate(iv) solution is CH3COOH (acetic acid). When acetic acid is added to a solution of trioxocarbonate(iv) (carbonate) it reacts to form carbon(iv)oxide gas, water and a salt. The balanced chemical equation for the reaction is: 2CH3COOH + Na2CO3 → CO2 + 2H2O + 2NaCH3COO The carbon(iv)oxide gas is released as bubbles, causing the solution to fizz. Therefore, CH3COOH is the organic compound that liberates carbon(iv)oxide from trioxocarbonate(iv) solution.

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Question 26 Report

The reactions below represent neutralization reaction, in which of them is the value of ΔH highest?

CH

_{3}

CH

_{2}

COOH + KOH → CH

_{3}

CH

_{2}

COOK + H

_{2}

O

NH

_{4}

OH + HCL → NH

_{4}

+ H

_{2}

O

NaOH + HCL → NaCL + H

_{2}

O

CH

_{3}

COOH + NaOH → CH

_{3}

COONa + H

_{2}

O

Answer Details

The reaction with the highest ΔH (change in enthalpy) would be the reaction between HCL and NaOH, which forms NaCL and H2O. This is because the formation of water releases energy in the form of heat, which is reflected in the positive ΔH value for this reaction. When an acid and a base react, they neutralize each other and form a salt and water, with the release of heat being a sign of an exothermic reaction.

Read lesson note on Environmental Pollution (JAMB)

Environmental Pollution

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Question 30 Report

An organic compound which decolorizes bromine water is likely to be?

C

_{3}

H

_{8}

C

_{2}

H

_{6}

C

_{4}

H

_{1} 0

C $_{2}$ H $_{4}$ $_{2}$ $_{4}$

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