SS2 third Term chemistry past questions and answers

SS2 third Term chemistry past questions and answers

Chemistry questions with options and answers:

Question: What is the chemical formula for hydrofluoric acid?

A) H2SO4

B) HF

C) HCl

D) HNO3

Answer: B) HF

Question: Which of the following elements is a noble gas?

A) Neon

B) Fluorine

C) Sodium

D) Potassium

Answer: A) Neon

Question: What is the pH of a solution with a hydroxide ion concentration of 1 x 10^-3 M?

A) 3

B) 7

C) 11

D) 14

Answer: C) 11

Question: Which type of reaction involves the combination of two or more substances to form a new substance?

A) Decomposition

B) Synthesis

C) Combustion

D) Displacement

Answer: B) Synthesis

Question: What is the chemical symbol for phosphorus?

A) P

B) Ph

C) Po

D) Pt

Answer: A) P

Question: Which of the following is a property of bases?

A) Sour taste

B) Turns red litmus paper blue

C) Low pH

D) Conducts electricity poorly

Answer: B) Turns red litmus paper blue

Question: What is the chemical formula for carbon monoxide?

A) CO

B) CO2

C) C2O

D) HCO3

Answer: A) CO

Question: What is the atomic number of chlorine?

A) 15

B) 17

C) 20

D) 25

Answer: B) 17

Question: Which gas is commonly used for welding and cutting metals?

A) Oxygen

B) Acetylene

C) Nitrogen

D) Argon

Answer: B) Acetylene

Question: What is the chemical formula for sodium hydroxide?

A) NaOH

B) HNO3

C) KOH

D) Ca(OH)2

Answer: A) NaOH

Question: What is the role of a catalyst in a chemical reaction?

A) Absorb heat

B) Increase pressure

C) Speed up the reaction

D) Inhibit the reaction

Answer: C) Speed up the reaction

Question: Which gas is responsible for the color and smell of rotten fruits?

A) Ethene

B) Methane

C) Ammonia

D) Hydrogen sulfide

Answer: A) Ethene

Question: What is the chemical symbol for potassium iodide?

A) PI

B) PO

C) KI

D) KO

Answer: C) KI

Question: What is the chemical formula for nitric acid?

A) HNO2

B) H2SO4

C) HCl

D) HNO3

Answer: D) HNO3

Question: Which element is essential for life and forms the basis of organic chemistry?

A) Nitrogen

B) Carbon

C) Oxygen

D) Hydrogen

Answer: B) Carbon

Question: What is the common name for calcium oxide?

A) Lime

B) Gypsum

C) Soda ash

D) Epsom salt

Answer: A) Lime

Question: What is the chemical formula for methane?

A) CH4

B) CO2

C) H2O

D) NH3

Answer: A) CH4

Question: Which gas is produced during the process of respiration in living organisms?

A) Oxygen

B) Carbon dioxide

C) Nitrogen

D) Hydrogen

Answer: B) Carbon dioxide

Question: What is the chemical symbol for iodine?

A) I

B) In

C) Fe

D) Ir

Answer: A) I

Question: Which of the following is a metalloid?

A) Silicon

B) Sodium

C) Silver

D) Sulfur

Answer: A) Silicon