Which of the following represents the kind of bonding present in ammonium chloride?

• A) ionic only
• B) covalent only
• C) ionic and dative covalent
• D) dative covalent

The pH of 0.50 mol dm^-3 solutions of HCI, H2SO₄and CH₃COOH were measured. which of the following statements about the values obtained is correct?

• A. the pH value was equal to 5 in each case
• B. the pH values of the HCI and H2SO₄ solutions were equal
• C. their pH values added uo to 14
• D. the pH value of the CH₃COOH was the highest.

Which of the following compounds is a secondary alkanol?

• A. Ethanol
• B. 2-methylbutan-2-ol
• C. 3-methylpentan-2-ol
• D. Propan-1-ol

Which of the following compounds is unsaturated?

• A. 2-methylbutane
• B. Chloromethane
• C. Methylbenzene
• D. 1,2-dibromoethane

Clothes should be properly rinsed with water after bleaching because?

• A. the bleach decolourizes the cothes
• B. chlorine reacts with fabrics during bleaching
• C. the clothes are sterilized during bleaching
• D. hydrogen chloride solution is produced during bleaching

When naphthalene on heating changes from solid state directly to the gaseous state, it undergoes

• A) sublimation
• B) evaporation
• C) combustion
• D) decomposition

Which of the following factors will affect the rate of the reaction represented by the following equation? 2HCl(aq) + CaCO₃(s) → CaCl₂(aq) + H₂O(1) + CO₂(g) I. Pressure II.Concentration III. Nature of reactants IV. Temperature

• A. I and II only
• B. II, III and IV only
• C. I, II and III only
• D. I, II. III and IV

When a solution of ammonium trioxocarbonate (IV) is added to a solution of an unknown salt, a white precipitate which is soluble in dilute hydrochloric acid but insoluble in ethanoic acid is formed. This indicates the presence of

• A) Ca²⁺
• B. Na⁺
• C. Zn²⁺
• D. K⁺

The d-block elements are paramagnetic because they

• A. contain paired electrons which are repelled by magnetic field
• B. contain unpaired electrons in the partially filled 3d-orbital
• C. contain paired electrons which are repelled by magnetic field force
• D. have delocalized valence electrons

When protein is heated to a high temperature it undergoes

• A. condensation
• B. denaturation
• C. hydrolysis
• D. polymerization