General Science

Which statement correctly identifies fertiliser?

A material supplying plant nutrients
B combination of substances retaining their chemical identities
C number of protons plus neutrons
D methods such as painting, galvanising or alloying that reduce corrosion

In general science, atom refers to:

A chemical/electrochemical deterioration of a material
B synthetic polyamide polymer
C smallest unit of an element retaining its chemical identity
D fossil fuel consisting mainly of methane

Which statement correctly identifies fuel?

A atoms of the same element with different neutron numbers
B substance donating H+ in Brønsted-Lowry theory
C substance releasing usable energy in combustion or another process
D horizontal row in the periodic table

What is the best description of melting point?

A liquefied petroleum gas, mainly propane and butane
B reaction releasing heat
C substance changing colour over a characteristic pH range
D temperature at which solid and liquid coexist at specified pressure

What is the best description of galvanisation?

A smallest unit of an element retaining its chemical identity
B substance used to control pests
C CO2, important greenhouse gas
D coating iron or steel with zinc

In general science, combustion refers to:

A elements showing intermediate metal/non-metal properties
B acid-base indicator red in acid and blue in base
C rapid reaction with an oxidant commonly releasing heat
D vertical column in the periodic table

In general science, petroleum refers to:

A liquid hydrocarbon mixture from geological deposits
B small molecule that can form a polymer
C loss of electrons or increase in oxidation state
D rapid reaction with an oxidant commonly releasing heat

In general science, solute refers to:

A surface vaporisation below boiling point
B chemical/electrochemical deterioration of a material
C salts of higher fatty acids
D substance dissolved in a solution

Which statement correctly identifies quicklime?

A Group 1 metals other than hydrogen
B positively charged ion
C calcium oxide
D positively charged subatomic particle

What is the best description of halogens?

A Group 17 elements
B atom or group of atoms carrying net electric charge
C two or more atoms chemically bonded
D Group 18 elements with very low reactivity

What is the best description of exothermic reaction?

A reaction releasing heat
B SI amount-of-substance unit containing Avogadro’s number of entities
C NH3, basic nitrogen compound used in fertilisers
D acidic precipitation associated mainly with sulfur and nitrogen oxides

Which of the following is most closely associated with reduction?

A gain of electrons or decrease in oxidation state
B mass of one mole of a substance
C atom or group of atoms carrying net electric charge
D two or more atoms chemically bonded

What is the best description of plaster of Paris?

A calcium sulfate hemihydrate
B NH3, basic nitrogen compound used in fertilisers
C acidic precipitation associated mainly with sulfur and nitrogen oxides
D SI amount-of-substance unit containing Avogadro’s number of entities

In general science, galvanisation refers to:

A Group 18 elements with very low reactivity
B substance accepting H+ or producing OH− in water
C atom or group of atoms carrying net electric charge
D coating iron or steel with zinc

In general science, noble gases refers to:

A vertical column in the periodic table
B loss of electrons or increase in oxidation state
C substance donating H+ in Brønsted-Lowry theory
D Group 18 elements with very low reactivity

Which of the following is most closely associated with detergent?

A two or more atoms chemically bonded
B mass of one mole of a substance
C atom or group of atoms carrying net electric charge
D synthetic surfactant used for cleaning

Which of the following is most closely associated with oxidation?

A negatively charged subatomic particle
B anything having mass and occupying space
C loss of electrons or increase in oxidation state
D chemical oxygen demand, oxygen equivalent needed for chemical oxidation of substances in water

Which statement correctly identifies evaporation?

A acid-base indicator red in acid and blue in base
B surface vaporisation below boiling point
C compressed natural gas, mainly methane
D reaction absorbing heat

In general science, acid rain refers to:

A acidic precipitation associated mainly with sulfur and nitrogen oxides
B biochemical oxygen demand, oxygen consumed by microbes decomposing organic matter in water
C pure substance whose atoms have the same atomic number
D nitrogen fertiliser, CO(NH2)2

In general science, oxidation refers to:

A loss of electrons or increase in oxidation state
B ethanoic acid, CH3COOH
C gas absorbing and emitting infrared radiation
D material supplying plant nutrients

What is the best description of bleaching powder?

A calcium hypochlorite-based bleaching/disinfecting material
B fertiliser supplying nitrogen, phosphorus and potassium
C sodium chloride
D biochemical oxygen demand, oxygen consumed by microbes decomposing organic matter in water

What is the best description of soap?

A substance producing ions in solution or molten state
B salts of higher fatty acids
C substance dissolved in a solution
D sodium carbonate decahydrate

In general science, natural gas refers to:

A fossil fuel consisting mainly of methane
B amorphous inorganic solid commonly based on silica
C reaction releasing heat
D compressed natural gas, mainly methane

In general science, anion refers to:

A negatively charged ion
B positively charged subatomic particle
C acidic precipitation associated mainly with sulfur and nitrogen oxides
D SI amount-of-substance unit containing Avogadro’s number of entities

Which statement correctly identifies atom?

A smallest unit of an element retaining its chemical identity
B large molecule made of repeating structural units
C rapid reaction with an oxidant commonly releasing heat
D loss of electrons or increase in oxidation state