A liquid begins to boil when?

• A. its vapour pressure is equal to the vapour pressure of its solid at the given temperature
• B. molecules start escaping from its surface
• C. its vapour pressure equals the atmosphere pressure
• D. its volume is sightly increased

Which of the following apparatus can be used to measure a specific volume of a liquid accurately?

• A. Beaker
• B. Conical flask
• C. Measuring cyclinder
• D. Pipette

Which of the following salts is insoluble in water?

• A. Pb(NO₃)₂
• B. Na₂CO₃
• C. AgNO₃
• D. AgCI.

When air in a syringe is compressed such that there is no change in temperature, the

• A. air liquefies
• B. pressure increases
• C. intermolecular space increases
• D. density decreases

Beryllium and aluminium have similar properties because they

• A) are both metals
• B) belong to the same group
• C) belong to the same period
• D) are positioned diagonally to each other

What is CaHb in the following equation? C a H b + 5O2 → 3CO 2 + 4H2O

• A. C₃H₄
• B. C₃H₆
• C. C₃H₈
• D. C₅H₁₀

Use the following option above to answer this question. Which of the following compounds in solution will turn red litmus paper blue?

• A) A
• B) B
• C) C
• D) D

Which of the following occurs when an aqueous solution of sodium hydroxide is electrolysed using graphite electrodes?

• A. Sodium metal is produced at the anode
• B. Sodium amalgam is formed at the cathode
• C. Oxygen gas is produced at the anode
• D. The grahite anode dissolves

Which of the following statements about atoms of a metal is correct? They

• A. readily accept electrons
• B. are soft
• C. are held together by covalent bond
• D. are held together by a sea of electron cloud

Potassium ethanoate is formed when:

• A) Methanoic acid reacts with KOH
• B) Ethanoic acid reacts with KOH
• C) Methanol reacts with KCO₃
• D) Ethanol reacts with CH₃COOH