CHEMISTRY FORM 4 REVISION 1

Substance X need to be stored in paraffin oil.

What is substance X?

• Silver

• Gold

• Aluminium

• Sodium

Which of the following cannot undergoes deposition process?

• I₂

• CO₂

• NaCl

• NH₄Cl

What is the meaning of Avogadro constant?

• Mass of one mole of substance

• Pressure of one mole of substance

• Volume occupied by one mole of gas

• Number of particles in one mole of a substance

The nucleus of an atom contains

• Proton

• Electron

• Neutron

The following chemical equation represents the reaction between potassium and oxygen.

4K (s) + O₂ (g) → 2K₂O (s)

Which statement is the best to describes the above reaction?

• 4 moles of potassium atoms reacts with 1 mole of oxygen atom

• 4 moles of potassium atoms reacts with 1 mole of oxygen molecule producing 2 moles of potassium oxide

• 4 moles of potassium atoms reacts with 1 mole of oxygen atom producing 2 moles of potassium oxide

• 4 moles of potassium atoms reacts with 1 mole of oxygen molecule

Which of the following are the element of Group 18 in the Periodic Table of Elements

• Helium and xenon

• Oxygen and neon

• Hydrogen and krypton

• Hydrogen and oxygen

Which of the following consists of diatomic molecule?

• Chlorine

• Neon

• Sodium

• Iron

Which of the following is a compound?

• Nitrogen

• Carbon dioxide

• Air

• Argon

Which of the following is the most electronegative atom?

• Iodine

• Fluorine

• Chlorine

• Helium

Which of the following acidic solutions contains the highest number of hydrogen ions?

• 100 cm³ of 0.1 mol dm⁻³ hydrochloric acid

• 50 cm³ of 0.2 mol dm⁻³ sulphuric acid

• 100 cm³ of 0.1 mol dm⁻³ ethanoic acid

• 50 cm³ of 0.2 mol dm⁻³ nitric acid