JAMB Chemistry Past Questions & Answers - Page 223

1,111.

Which of the following in aqueous solution is neutral to litmus?

NH₄CI

NaCO₃

FeCl₃

NaCl

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

1,112.

Which of the following dilute solutions has the lowest pH value?

Calcium trioxocarbonate (IV)

Sodium trioxocarbonate (IV)

Hydrochloric acid

Ethanoic acid

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Correct answer is C

No explanation has been provided for this answer.

1,113.

A substance S is isomorphous with another substance R. When a tiny crystals of S is added into a supersaturated solution of R?

S dissolves in the solution

crystals of R are precipitated

there is no observable change

R and S react to generate heat

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Correct answer is B

No explanation has been provided for this answer.

1,114.

The ion that may be assumed to have negligible concentration in a sample of water that lathers readily with soap is?

Mg⁺

K⁺

CO₂^2-

HCO₃

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Correct answer is A

Calcium and magnesium ions (particularly calcium) negatively influence cleansing power of detergents, because these form nearly insoluble salts with soap. When the water lathers readily, it means these ions are in negligible concentration in the water.

1,115.

Starch can be converted to ethyl alcohol by?

distillation

fermentation

isomerization

cracking

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Correct answer is B

No explanation has been provided for this answer.