500 Likely Chemistry JAMB Questions

These flashcards cover key concepts and questions from the Chemistry JAMB preparation material.

Zinc Oxide is a?

A. Acidic oxide B. Basic oxide C. Amphoteric oxide D. Neutral oxide

What happens when sodium chloride and metallic sodium are each dissolved in water?

A. Both form alkaline solutions B. Sodium chloride forms a neutral solution and metallic sodium forms an alkaline solution C. Both form neutral solutions D. Sodium chloride forms an acidic solution and metallic sodium forms a neutral solution

The periodic classification of elements is an arrangement of the elements in order of their?

A. Atomic masses B. Atomic numbers C. Electron configurations D. Relative atomic masses

In the reaction between sodium hydroxide and sulphuric acid solutions, what volume of 0.5 molar sodium hydroxide would exactly neutralize 10cm³ of 1.25 molar sulphuric acid?

A. 25 cm³ B. 50 cm³ C. 75 cm³ D. 100 cm³

A small quantity of solid ammonium chloride (NH4Cl) was heated gently in a test tube; the solid gradually disappears to produce two gases. Later, a white cloudy deposit was observed on the cooler part of the test tube. The ammonium chloride is said to have undergone?

A. Decomposition B. Sublimation C. Dissociation D. Evaporation

An element X forms the following compounds with chlorine; XCl, XCl2, XCl3. This illustrates the law of?

A. Conservation of mass B. Constant composition C. Multiple proportions D. Reciprocal proportions

The oxidation state of chlorine in potassium chlorate is?

A. +1 B. +3 C. +5 D. +7

What happens when heat is absorbed during a chemical reaction?

A. Exothermic B. Endothermic C. Isothermal D. Thermodynamic

When large hydrocarbon molecules are heated at high temperature in the presence of a catalyst to give smaller molecules, the process is known as?

A. Polymerization B. Reforming C. Cracking D. Fractional distillation

When ammonia and hydrogen ion bond together to form ammonium ion, the bond formed is called?

A. Ionic bond B. Covalent bond C. Dative (coordinate) bond D. Metallic bond

The nucleus of an atom contains?

A. Protons and electrons B. Protons and neutrons C. Electrons and neutrons D. Protons, neutrons and electrons

Hypochlorous acid is used as a bleach because?

A. It is a strong acid B. It releases nascent oxygen which oxidizes coloring matter C. It dissolves in water easily D. It releases chlorine gas which absorbs colours

The most common type of chemical reaction which alkanes undergo is?

A. Addition reaction B. Elimination reaction C. Substitution reaction D. Polymerization

Consider the following exothermic reaction: 2SO2(g) + O2(g) ⇌ 2SO3(g). What happens if the temperature of the reaction is reduced from 800°C to 500°C, and no other change takes place?

A. The equilibrium shifts to the left, producing more SO2 B. The equilibrium shifts to the right, producing more SO3 C. There is no change in equilibrium position D. Both forward and reverse reaction rates increase

The reaction between an organic acid and an alcohol in the presence of an acid catalyst is known as?

A. Hydrolysis B. Saponification C. Esterification D. Fermentation

If 30 cm³ of oxygen diffuses through a porous pot in 7 seconds, how long will it take 60cm³ of chlorine to diffuse through the same pot if the vapour densities of oxygen and chlorine are 16 and 36 respectively?

A. 14 seconds B. 21 seconds C. 28 seconds D. 42 seconds

Brass is composed of?

A. Copper and tin B. Copper and zinc C. Zinc and iron D. Copper and iron

The gas that will form a white precipitate with acidified silver trioxonitrate (V) is?

A. SO2 B. CO2 C. HCl D. NH3

The entropy and enthalpy of a system are a measure of?

A. The heat content and degree of disorder respectively B. The degree of disorder and heat content respectively C. The rate of reaction and activation energy respectively D. The free energy and activation energy respectively

The process of electrolysis involves passing an electric current through a solution. Which of the following occurs?

A. The process causes water to ionize, producing hydrogen ions B. Electric current heats the solution C. Solvent molecules are displaced D. Hydrogen is evolved at the cathode.

A gas jar was inverted over burning yellow phosphorus floating over water in a beaker. After burning, the water level was found to rise in the gas jar. The water level rises because?

A. Phosphorus absorbs the water B. Oxygen in the air is used up, reducing the pressure inside the jar C. The heat created a vacuum D. Nitrogen dissolves in water

The oxidation state of chromium in K2Cr2O7 is?

A. +3 B. +6 C. +5 D. +7