General Science

Which statement correctly identifies mass number?

A calcium hypochlorite-based bleaching/disinfecting material
B separation of insoluble solids from a fluid using a filter
C homogeneous mixture of solute and solvent
D number of protons plus neutrons

Which of the following is most closely associated with period?

A reaction absorbing heat
B horizontal row in the periodic table
C acid-base indicator red in acid and blue in base
D elements showing intermediate metal/non-metal properties

What is the best description of PTFE/Teflon?

A corrosion product formed mainly on iron/steel
B amount of solute relative to a specified quantity
C fluoropolymer known for chemical resistance and low friction
D solid-to-gas change without passing through liquid

Which of the following is most closely associated with solute?

A calcium hypochlorite-based bleaching/disinfecting material
B substance dissolved in a solution
C homogeneous mixture of solute and solvent
D ethanoic acid, CH3COOH

Which of the following is most closely associated with solvent?

A sodium chloride
B component that dissolves the solute
C sodium hydrogen carbonate, NaHCO3
D fertiliser supplying nitrogen, phosphorus and potassium

What is the best description of alkali metals?

A negatively charged ion
B anything having mass and occupying space
C negatively charged subatomic particle
D Group 1 metals other than hydrogen

In general science, steel refers to:

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

What is the best description of electrolysis?

A pure substance formed by chemical combination of elements in fixed proportions
B chemical decomposition driven by electric current
C methods such as painting, galvanising or alloying that reduce corrosion
D number of protons in the nucleus

Which statement correctly identifies atomic number?

A chemical/electrochemical deterioration of a material
B surface vaporisation below boiling point
C number of protons in the nucleus
D water containing appreciable calcium or magnesium ions

Which statement correctly identifies baking soda?

A methods such as painting, galvanising or alloying that reduce corrosion
B sodium hydrogen carbonate, NaHCO3
C aqueous solution containing acetic acid
D O3, allotrope of oxygen

Which statement correctly identifies hard water?

A sodium hydrogen carbonate, NaHCO3
B temperature at which solid and liquid coexist at specified pressure
C water containing appreciable calcium or magnesium ions
D sodium chloride

In general science, proton refers to:

A mixture or solid solution of metals or metal with another element
B positively charged subatomic particle
C substance dissolved in a solution
D substance producing ions in solution or molten state

Which statement correctly identifies vinegar?

A reaction between acid and base forming salt and usually water
B aqueous solution containing acetic acid
C substance changing reaction rate without being consumed overall
D Group 17 elements

Which statement correctly identifies neutralisation?

A amorphous inorganic solid commonly based on silica
B reaction between acid and base forming salt and usually water
C chemical decomposition driven by electric current
D temperature at which solid and liquid coexist at specified pressure

Which of the following is most closely associated with alkali metals?

A Group 1 metals other than hydrogen
B polymer produced from ethene
C solid fossil fuel formed largely from ancient plant matter
D reaction involving oxidation and reduction together

Which of the following is most closely associated with metalloids?

A iron-based alloy containing carbon
B elements showing intermediate metal/non-metal properties
C separation based mainly on differences in boiling points
D component that dissolves the solute

In general science, redox reaction refers to:

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

Which statement correctly identifies plaster of Paris?

A material supplying plant nutrients
B combination of substances retaining their chemical identities
C calcium sulfate hemihydrate
D number of protons plus neutrons

What is the best description of noble gases?

A Group 18 elements with very low reactivity
B methods such as painting, galvanising or alloying that reduce corrosion
C pure substance formed by chemical combination of elements in fixed proportions
D number of protons in the nucleus

Which statement correctly identifies acid rain?

A gas absorbing and emitting infrared radiation
B calcium hypochlorite-based bleaching/disinfecting material
C ethanoic acid, CH3COOH
D acidic precipitation associated mainly with sulfur and nitrogen oxides

In general science, greenhouse gas refers to:

A gas absorbing and emitting infrared radiation
B calcium oxide
C NH3, basic nitrogen compound used in fertilisers
D salts of higher fatty acids

What is the best description of matter?

A pure substance whose atoms have the same atomic number
B uncharged subatomic particle
C combining capacity of an atom or ion
D anything having mass and occupying space

In general science, quicklime refers to:

A vertical column in the periodic table
B calcium oxide
C elements showing intermediate metal/non-metal properties
D acid-base indicator red in acid and blue in base

In general science, COD refers to:

A positively charged subatomic particle
B SI amount-of-substance unit containing Avogadro’s number of entities
C chemical oxygen demand, oxygen equivalent needed for chemical oxidation of substances in water
D CO, toxic product of incomplete combustion

What is the best description of natural gas?

A elements generally showing conductivity, malleability and ductility
B combining capacity of an atom or ion
C fossil fuel consisting mainly of methane
D ionic compound of cations and anions