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Chemistry Past Questions | JAMB, WAEC, NECO and Post UTME Past Questions

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Question 11

An aqueous solution of (NH4)2 SO4 is

Options

A) Acidic

B) Alkaline

C) Amphoteric

D) Neutral

Suggested Lesson: Reactions in Aqueous Solution | Reactions in Aqueous Solution

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Question 12

When NH4Cl(s) is dissolved in water, the container feels cold to touch. This implies

Options

A) The process is endothermic

B) The process is exothermic

C) NH4Cl forms a saturated solution

D) NH4Cl is highly soluble in water

Suggested Lesson: Properties of Covalent Compounds | Bonding and Atomic Combinations

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Question 13

The pH of four solutions M, N, Q and R are 2, 6, 8 and 11 respectively.
Which of the following deductions about the solutions is correct?

Options

A) The pH of N is increased when the solution is diluted

B) The pH of Q is increased when the solution is evaporated

C) M is the most alkaline solution

D) R is the most acidic solution

Suggested Lesson: The pH scale | Acid-Base and Redox Reactions

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Question 14

Consider the following reaction equation
H3O+(aq) + OH(aq) → 2H2O(l)
The reaction represents

Options

A) Esterification

B) Hydrolysis

C) Neutralization

D) Redox

Suggested Lesson: Acid-Base Neutralization | Acid-Base Equilibria

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Question 15

The refreshing characteristic taste of fizzy drinks is due to the presence of

Options

A) Carbon (IV) oxide

B) Glucose

C) Hydrogen

D) Sodium Citrate

Suggested Lesson: The pH scale | Acid-Base and Redox Reactions

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Question 16

Chemical equilibrium is attained when

Options

A) All the reactants have been completely used up

B) The reaction goes to completion

C) The concentration of reactants and products remain constant

D) The concentration of reactants and products are equal

Suggested Lesson: Summarizing Equilibrium Constants | Fundamental Equilibrium Concepts

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Question 17

Which of the following factors will affect the rate of the reaction represented by the following equation?
2HCl(aq) + CaCO3(s) → CaCl2(aq) + H2O(l) + CO2(g)

I. Pressure
II. Concentration
III. Nature of reactants
IV. Temperature

Options

A) I and II only

B) II, III and IV only

C) I, II and III only

D) I, II, III and IV

Suggested Lesson: Names and Formulae of Substances | Classification of Matter

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Question 18

On evaporation to dryness, 350cm\(^3\) of saturated solution of salt Z gave 55.5g of salt. What is the solubility of the salt? [Z = 101]

Options

A) 1.57 moldm-3

B) 3.14 moldm-3

C) 6.28 moldm-3

D) 12.56 moldm-3

Suggested Lesson: Solubility | Solutions and Colloids

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Question 19

Which of the following salts when dissolved in water will form a solution that will change blue litmus to red?

Options

A) CH3COONa

B) NH4Cl

C) NaCl

D) KCl

Suggested Lesson: Acid-Base Indicators | Acid-Base Equilibria

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Question 20

Which of the following bonds are broken when ethanol is boiled?

I. Covalent bonds
II. Ionic bonds
III. Hydrogen bonds

Options

A) I only

B) II only

C) III only

D) I, II, III

Suggested Lesson: Covalent Bonding | Chemical Bonding

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