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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

Related Lesson: Reactions in Aqueous Solution | Reactions in Aqueous Solution

Comments (2)

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

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

Comments (5)

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

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

Comments (4)

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

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

Comments (3)

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

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

Comments (2)

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

Related Lesson: Summarizing Equilibrium Constants | Fundamental Equilibrium Concepts

Comments (1)

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

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

Comments (4)

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

Related Lesson: Solubility | Solutions and Colloids

Comments (4)

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

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

Comments (2)

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

Related Lesson: Covalent Bonding | Chemical Bonding

Comments (1)
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