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NECTA Chemistry AI Practice

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Note: Diagram-based questions are coming soon. WAEC Biology Paper includes ~5 diagram questions.

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Question 161

Which salt is typically formed when hydrochloric acid reacts with sodium hydroxide?
Acids, bases, saltsSaltsmedium

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Question 162

What is the atomic number of an element that has 11 protons in its nucleus?
Atomic structureAtomic structure and classification of elementseasy

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Question 163

How many moles are present in 18 grams of water (H₂O)? (Molar mass of H₂O = 18 g/mol)
Mole conceptMole concept and stoichiometryeasy

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Question 164

For the reaction N₂ + 3H₂ ⇌ 2NH₃, which of the following changes will shift the equilibrium to the right according to Le Chatelier's principle?
Rates and equilibriumRates of reaction and chemical equilibriumhard

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Question 165

Which subatomic particle has a negligible mass compared to protons and neutrons?
Atomic structureAtomic structure and classification of elementsmedium

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Question 166

Which of the following is NOT a property of ionic compounds?
Chemical bondingChemical bonding and molecular structurehard

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Question 167

What is the number of neutrons in an atom of carbon-14?
Atomic structure1.1 Atomic structureeasy

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Question 168

Which type of bond is formed by the transfer of electrons from one atom to another?
Chemical bonding2.1 Types of chemical bondseasy

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Question 169

How many moles of oxygen gas (O₂) are present in 44 grams of O₂? (Molar mass of O₂ = 32 g/mol)
Mole concept3.1 Mole concepteasy

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Question 170

What effect does increasing the temperature have on the rate of a chemical reaction?
Rates and equilibrium8.2 Factors affecting reaction ratemedium

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