Which functional group is present in alkanals?
- A. Carbonyl group (C=O)
- B. Hydroxyl group (-OH)
- C. Alkyl group (-R)
- D. Carboxyl group (-COOH)
What happens when alkanoic acids react with alcohols in the presence of an acid catalyst?
- A. Saponification
- B. Esterification
- C. Polymerization
- D. Hydrolysis
Which of the following metals is commonly alloyed with copper to make brass?
- A. Iron
- B. Nickel
- C. Aluminum
- D. Zinc
Which type of salt is found in antacid medications and is used to relieve heartburn and indigestion?
- A. Aluminum chloride
- B. Magnesium chloride
- C. Sodium chloride
- D. Calcium chloride
When anhydrous cobalt chloride paper is exposed to water, what color change is observed?
- A. From pink to blue
- B. From white to blue
- C. From blue to white
- D. From blue to pink
What is the valency of an element with the electronic configuration 2, 8, 7?
- A. 7
- B. 1
- C. 2
- D. 3
Which of the following methods is commonly used to remove suspended impurities from water?
- A. Fluoridation
- B. Chlorination
- C. Filtration
- D. Distillation
Which transition metal is known for its multiple colorful oxidation states and compounds used in pigments and paints?
- A. Silver (Ag)
- B. Copper (Cu)
- C. Gold (Au)
- D. Zinc (Zn)
Which element is placed at the top of the electrochemical series?
- A. Copper
- B. Hydrogen
- C. Sodium
- D. Oxygen
Isotopes of an element have
- A. The same number of protons but different numbers of neutrons.
- B. The same number of neutrons and electrons
- C. The same number of protons and neutrons
- D. The same number of protons and electrons
What is the molecular geometry of a molecule with three bonding pairs and no lone pairs around the central atom?
- A. Tetrahedral
- B. Trigonal planar
- C. Linear
- D. Octahedral
At room temperature and standard pressure, chlorine gas is in which state of matter?
- A. Plasma
- B. Solid
- C. Liquid
- D. Gas
Sodium reacts vigorously with water to produce
- A. Sodium chloride (NaCl) and oxygen gas (O2)
- B. Sodium nitrate (NaNO3) and water (H2O)
- C. Sodium hydroxide (NaOH) and hydrogen gas (H2)
- D. Sodium oxide (Na2O) and hydrogen gas (H2)
Which of the following is a unique property of water compared to other liquids?
- A. It is a poor solvent
- B. It does not evaporate
- C. It expands when freezing
- D. It has a low heat capacity
The contact process is used for the industrial production of
- A. sulfuric acid (H2SO4)
- B. Hydrochloric acid (HCl)
- C. Sodium hydroxide (NaOH)
- D. Calcium oxide (CaO)
If gas A has a molar mass of 32 g/mol and gas B has a molar mass of 64 g/mol, what is the ratio of their diffusion rates?
- A. 2:1
- B. 1:2
- C. 1:1
- D. 1:4
Which of the following compounds is an example of an electrovalent bond?
- A. NaCl (sodium chloride)
- B. CO2 (carbon dioxide)
- C. H2O (water)
- D. CH4 (methane)
A blue litmus paper turns red when dipped into a solution. What does this indicate about the solution?
- A. The solution is basic
- B. The solution is neutral
- C. The solution is acidic
- D. The litmus paper is faulty
When a substance is oxidized, it
- A. Loses electrons
- B. Gains oxygen atoms
- C. Gains electrons
- D. Loses protons (H+ ions)
What is the symbol used to represent an alpha particle?
- A. ฮฑ
- B. ฮณ
- C. ฮด
- D. ฮฒ