1. Which of the following is NOT a property of ionic compounds? Ionic compounds are generally soluble in polar solvents like water, but not in non-polar organic solvents. They have high melting points, conduct electricity when molten or in solution, and exist as crystalline solids. The correct option is C. C. Soluble in organic solvents 2. The IUPAC name of CH₃CH₂OH is: CH₃CH₂OH has two carbon atoms and an -OH functional group, making it an alcohol. The prefix for two carbons is "eth-", and the suffix for an alcohol is "-ol". The correct option is B. B. Ethanol 3. How many moles are in 44g of CO₂? (C=12, O=16) Step 1: Calculate the molar mass of CO₂. $$ \text{Molar mass of CO}_2 = (1 \times 12) + (2 \times 16) = 12 + 32 = 44 \text{ g/mol} $$ Step 2: Calculate the number of moles. $$ \text{Moles} = \frac{\text{Mass}}{\text{Molar mass}} = \frac{44 \text{ g}}{44 \text{ g/mol}} = 1 \text{ mol} $$ The correct option is A. A. 1 mol 4. Which gas is produced when zinc reacts with dilute H₂SO₄? When a reactive metal like zinc reacts with a dilute acid like sulfuric acid, hydrogen gas is produced. $$ \text{Zn(s)} + \text{H}_2\text{SO}_4\text{(aq)} \longrightarrow \text{ZnSO}_4\text{(aq)} + \text{H}_2\text{(g)} $$ The correct option is C. C. Hydrogen 5. The process by which liquid changes to vapour below its boiling point is: Evaporation is the process where a liquid changes into a gas or vapor without reaching its boiling point. The correct option is B. B. Evaporation 6. An element with atomic number 17 belongs to which group? An element with atomic number 17 has an electron configuration of 2, 8, 7. It has 7 valence electrons, placing it in Group VII (halogens) of the periodic table. The correct option is C. C. Group VII 7. Which of the following is an example of an ester? Esters have the general formula R-COO-R', where R and R' are alkyl groups. CH₃COOCH₃ fits this structure. The correct option is C. C. CH₃COOCH₃ 8. The bond in hydrogen gas (H₂) is: Hydrogen gas (H₂) consists of two hydrogen atoms sharing a pair of electrons to achieve a stable electron configuration. This sharing of electrons forms a covalent bond. The correct option is B. B. Covalent 9. Avogadro's number is: Avogadro's number is the number of constituent particles (atoms, molecules, ions, etc.) per mole of a substance, approximately $6.022 \times 10^{23}$. The correct option is B. B. 6.02 × 10²³ 10. Which of the following undergoes sublimation? Sublimation is the process where a solid changes directly into a gas without passing through the liquid phase. Iodine is a common example of a substance that sublimes. The correct option is B. B. Iodine Send me the next one 📸