General Science

In general science, valency refers to:

A combining capacity of an atom or ion
B smallest unit of an element retaining its chemical identity
C atoms of the same element with different neutron numbers
D substance used to control pests

In general science, boiling point refers to:

A iron-based alloy containing carbon
B separation based mainly on differences in boiling points
C temperature at which vapour pressure equals surrounding pressure
D small molecule that can form a polymer

In general science, ion refers to:

A ethanoic acid, CH3COOH
B atom or group of atoms carrying net electric charge
C gas absorbing and emitting infrared radiation
D material supplying plant nutrients

What is the best description of rust prevention?

A nitrogen fertiliser, CO(NH2)2
B methods such as painting, galvanising or alloying that reduce corrosion
C chemical oxygen demand, oxygen equivalent needed for chemical oxidation of substances in water
D calcium hydroxide

In general science, baking soda refers to:

A SI amount-of-substance unit containing Avogadro’s number of entities
B positively charged subatomic particle
C acidic precipitation associated mainly with sulfur and nitrogen oxides
D sodium hydrogen carbonate, NaHCO3

Which of the following is most closely associated with soap?

A salts of higher fatty acids
B chemical oxygen demand, oxygen equivalent needed for chemical oxidation of substances in water
C anything having mass and occupying space
D negatively charged subatomic particle

Which of the following is most closely associated with corrosion?

A loss of electrons or increase in oxidation state
B substance donating H+ in Brønsted-Lowry theory
C horizontal row in the periodic table
D chemical/electrochemical deterioration of a material

Which of the following is most closely associated with rust?

A measure related to hydrogen-ion activity/concentration
B positively charged ion
C Group 1 metals other than hydrogen
D corrosion product formed mainly on iron/steel

Which of the following is most closely associated with greenhouse gas?

A ethanoic acid, CH3COOH
B gas absorbing and emitting infrared radiation
C substance used to control pests
D CO2, important greenhouse gas

What is the best description of non-metals?

A combining capacity of an atom or ion
B elements generally showing conductivity, malleability and ductility
C elements generally lacking typical metallic properties
D substance changing colour over a characteristic pH range

Which of the following is most closely associated with ozone?

A acidic precipitation associated mainly with sulfur and nitrogen oxides
B CH4, simplest alkane and major natural-gas component
C calcium sulfate dihydrate
D O3, allotrope of oxygen

In general science, indicator refers to:

A calcium hydroxide
B nitrogen fertiliser, CO(NH2)2
C synthetic surfactant used for cleaning
D substance changing colour over a characteristic pH range

In general science, detergent refers to:

A pure substance whose atoms have the same atomic number
B synthetic surfactant used for cleaning
C fertiliser supplying nitrogen, phosphorus and potassium
D biochemical oxygen demand, oxygen consumed by microbes decomposing organic matter in water

In general science, monomer refers to:

A coating iron or steel with zinc
B small molecule that can form a polymer
C temperature at which vapour pressure equals surrounding pressure
D salts of higher fatty acids

In general science, alkali metals refers to:

A substance changing colour over a characteristic pH range
B Group 1 metals other than hydrogen
C elements generally lacking typical metallic properties
D reaction releasing heat

What is the best description of carbon dioxide?

A CO2, important greenhouse gas
B separation of insoluble solids from a fluid using a filter
C homogeneous mixture of solute and solvent
D steel containing sufficient chromium for corrosion resistance

Which of the following is most closely associated with matter?

A solid fossil fuel formed largely from ancient plant matter
B polymer produced from ethene
C anything having mass and occupying space
D reaction involving oxidation and reduction together

In general science, acetic acid refers to:

A fluoropolymer known for chemical resistance and low friction
B ethanoic acid, CH3COOH
C liquefied petroleum gas, mainly propane and butane
D reaction releasing heat

Which statement correctly identifies neutron?

A amorphous inorganic solid commonly based on silica
B uncharged subatomic particle
C temperature at which solid and liquid coexist at specified pressure
D chemical decomposition driven by electric current

Which statement correctly identifies detergent?

A calcium sulfate hemihydrate
B CO2, important greenhouse gas
C an alcohol used in sanitizers, solvents and fuels
D synthetic surfactant used for cleaning

Which statement correctly identifies ion?

A salts of higher fatty acids
B NH3, basic nitrogen compound used in fertilisers
C atom or group of atoms carrying net electric charge
D calcium oxide

What is the best description of evaporation?

A surface vaporisation below boiling point
B reaction involving oxidation and reduction together
C Group 1 metals other than hydrogen
D measure related to hydrogen-ion activity/concentration

In general science, common salt refers to:

A reaction involving oxidation and reduction together
B solid fossil fuel formed largely from ancient plant matter
C measure related to hydrogen-ion activity/concentration
D sodium chloride

Which statement correctly identifies bleaching powder?

A two or more atoms chemically bonded
B calcium hypochlorite-based bleaching/disinfecting material
C CO, toxic product of incomplete combustion
D mass of one mole of a substance

Which statement correctly identifies oxidation?

A calcium oxide
B salts of higher fatty acids
C NH3, basic nitrogen compound used in fertilisers
D loss of electrons or increase in oxidation state