SS1 Third Term Chemistry Past Questions and Answers

What is the chemical formula for common table sugar (sucrose)?

 

A) C6H12O6

B) CH3COOH

C) C12H22O11

D) CO2

Answer: C) C12H22O11

Which gas is responsible for the characteristic smell of chlorine bleach?

 

A) Chlorine

B) Hydrogen

C) Oxygen

D) Nitrogen

Answer: A) Chlorine

What is the chemical symbol for mercury?

 

A) Hg

B) Me

C) Mr

D) Hy

Answer: A) Hg

In the periodic table, which period corresponds to the elements placed in a horizontal row?

 

A) Group

B) Series

C) Period

D) Class

Answer: C) Period

What is the chemical formula for carbon dioxide?

 

A) CO

B) CO2

C) C2O

D) C2O2

Answer: B) CO2

Which gas is produced when acids react with metals?

 

A) Hydrogen

B) Oxygen

C) Nitrogen

D) Chlorine

Answer: A) Hydrogen

What is the process of breaking down complex substances into simpler ones by living organisms?

 

A) Respiration

B) Digestion

C) Fermentation

D) Combustion

Answer: B) Digestion

Which element is used as a moderator in nuclear reactors?

 

A) Uranium

B) Thorium

C) Boron

D) Graphite

Answer: D) Graphite

What is the chemical symbol for phosphorus?

 

A) P

B) Ph

C) Po

D) Pt

Answer: A) P

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

 

A) Decomposition reaction

B) Precipitation reaction

C) Synthesis reaction

D) Redox reaction

Answer: C) Synthesis reaction

What is the chemical symbol for silver nitrate?

 

A) AgNO2

B) AgNO3

C) Ag2NO3

D) Ag2NO2

Answer: B) AgNO3

Which gas is responsible for the “pop” sound in fireworks?

 

A) Oxygen

B) Nitrogen

C) Hydrogen

D) Helium

Answer: C) Hydrogen

What is the chemical formula for hydrofluoric acid?

 

A) H2SO4

B) HF

C) HCl

D) HNO3

Answer: B) HF

Which of the following is a noble gas?

 

A) Helium

B) Fluorine

C) Sodium

D) Sulfur

Answer: A) Helium

What is the chemical symbol for tin?

 

A) Ti

B) Sn

C) Ta

D) Tn

Answer: B) Sn

Which element is present in all organic compounds?

 

A) Oxygen

B) Carbon

C) Hydrogen

D) Nitrogen

Answer: B) Carbon

What is the chemical formula for common salt?

 

A) Na2SO4

B) NaCl

C) NaOH

D) NaNO3

Answer: B) NaCl

Which type of bond is formed by the transfer of electrons from one atom to another?

 

A) Covalent bond

B) Ionic bond

C) Metallic bond

D) Van der Waals bond

Answer: B) Ionic bond

What is the chemical symbol for cobalt?

 

A) Co

B) Cl

C) Ca

D) Cb

Answer: A) Co

Which g

as is commonly used as a fuel in household stoves?

 

A) Methane

B) Propane

C) Butane

D) Ethane

Answer: A) Methane