General Science

Which statement correctly identifies redox reaction?

A aqueous solution containing acetic acid
B O3, allotrope of oxygen
C methods such as painting, galvanising or alloying that reduce corrosion
D reaction involving oxidation and reduction together

What is the best description of boiling point?

A substance donating H+ in Brønsted-Lowry theory
B rapid reaction with an oxidant commonly releasing heat
C temperature at which vapour pressure equals surrounding pressure
D loss of electrons or increase in oxidation state

Which statement correctly identifies isotope?

A sodium chloride
B substance dissolved in a solution
C atoms of the same element with different neutron numbers
D sodium hydrogen carbonate, NaHCO3

What is the best description of coal?

A atom or group of atoms carrying net electric charge
B Group 18 elements with very low reactivity
C solid fossil fuel formed largely from ancient plant matter
D two or more atoms chemically bonded

Which statement correctly identifies soap?

A salts of higher fatty acids
B water containing appreciable calcium or magnesium ions
C NH3, basic nitrogen compound used in fertilisers
D calcium oxide

What is the best description of metalloids?

A reaction between acid and base forming salt and usually water
B elements showing intermediate metal/non-metal properties
C Group 1 metals other than hydrogen
D substance changing reaction rate without being consumed overall

Which statement correctly identifies polyethylene?

A chemical decomposition driven by electric current
B amorphous inorganic solid commonly based on silica
C temperature at which solid and liquid coexist at specified pressure
D polymer produced from ethene

Which of the following is most closely associated with quicklime?

A reaction between acid and base forming salt and usually water
B liquid hydrocarbon mixture from geological deposits
C substance changing reaction rate without being consumed overall
D calcium oxide

Which statement correctly identifies alkali metals?

A Group 1 metals other than hydrogen
B substance accepting H+ or producing OH− in water
C atoms of the same element with different neutron numbers
D horizontal row in the periodic table

Which of the following is most closely associated with LPG?

A separation based mainly on differences in boiling points
B component that dissolves the solute
C liquefied petroleum gas, mainly propane and butane
D iron-based alloy containing carbon

What is the best description of COD?

A an alcohol used in sanitizers, solvents and fuels
B chemical oxygen demand, oxygen equivalent needed for chemical oxidation of substances in water
C calcium sulfate hemihydrate
D amount of solute relative to a specified quantity

What is the best description of compound?

A substance donating H+ in Brønsted-Lowry theory
B pure substance formed by chemical combination of elements in fixed proportions
C atoms of the same element with different neutron numbers
D horizontal row in the periodic table

In general science, BOD refers to:

A smallest unit of an element retaining its chemical identity
B atoms of the same element with different neutron numbers
C biochemical oxygen demand, oxygen consumed by microbes decomposing organic matter in water
D substance used to control pests

In general science, rust refers to:

A arrangement of elements by atomic number and recurring properties
B pure substance formed by chemical combination of elements in fixed proportions
C corrosion product formed mainly on iron/steel
D number of protons in the nucleus

In general science, catalyst refers to:

A atoms of the same element with different neutron numbers
B substance used to control pests
C smallest unit of an element retaining its chemical identity
D substance changing reaction rate without being consumed overall

What is the best description of monomer?

A substance changing reaction rate without being consumed overall
B small molecule that can form a polymer
C synthetic polyamide polymer
D liquid hydrocarbon mixture from geological deposits

What is the best description of detergent?

A calcium hydroxide
B temperature at which vapour pressure equals surrounding pressure
C salts of higher fatty acids
D synthetic surfactant used for cleaning

Which statement correctly identifies petroleum?

A reaction between acid and base forming salt and usually water
B Group 17 elements
C liquid hydrocarbon mixture from geological deposits
D substance changing reaction rate without being consumed overall

In general science, bleaching powder refers to:

A pure substance formed by chemical combination of elements in fixed proportions
B arrangement of elements by atomic number and recurring properties
C number of protons in the nucleus
D calcium hypochlorite-based bleaching/disinfecting material

What is the best description of proton?

A positively charged subatomic particle
B reaction absorbing heat
C acid-base indicator red in acid and blue in base
D compressed natural gas, mainly methane

In general science, mass number refers to:

A synthetic surfactant used for cleaning
B number of protons plus neutrons
C nitrogen fertiliser, CO(NH2)2
D calcium hydroxide

What is the best description of distillation?

A atom or group of atoms carrying net electric charge
B Group 18 elements with very low reactivity
C two or more atoms chemically bonded
D separation based mainly on differences in boiling points

Which of the following is most closely associated with coal?

A reaction absorbing heat
B large molecule made of repeating structural units
C solid fossil fuel formed largely from ancient plant matter
D mixture or solid solution of metals or metal with another element

Which statement correctly identifies activation energy?

A mass of one mole of a substance
B two or more atoms chemically bonded
C energy barrier associated with a reaction pathway
D CO, toxic product of incomplete combustion

Which of the following is most closely associated with anion?

A horizontal row in the periodic table
B number of protons plus neutrons
C negatively charged ion
D combination of substances retaining their chemical identities