General Science

In general science, electrolysis refers to:

A acid-base indicator red in acid and blue in base
B elements showing intermediate metal/non-metal properties
C chemical decomposition driven by electric current
D vertical column in the periodic table

Which of the following is most closely associated with periodic table?

A Group 17 elements
B positively charged ion
C reaction between acid and base forming salt and usually water
D arrangement of elements by atomic number and recurring properties

In general science, electron refers to:

A temperature at which vapour pressure equals surrounding pressure
B salts of higher fatty acids
C coating iron or steel with zinc
D negatively charged subatomic particle

What is the best description of pH?

A energy barrier associated with a reaction pathway
B measure related to hydrogen-ion activity/concentration
C synthetic polyamide polymer
D fossil fuel consisting mainly of methane

In general science, vinegar refers to:

A loss of electrons or increase in oxidation state
B large molecule made of repeating structural units
C aqueous solution containing acetic acid
D rapid reaction with an oxidant commonly releasing heat

What is the best description of acetic acid?

A ionic compound of cations and anions
B elements generally showing conductivity, malleability and ductility
C ethanoic acid, CH3COOH
D combining capacity of an atom or ion

In general science, metals refers to:

A gain of electrons or decrease in oxidation state
B small molecule that can form a polymer
C elements generally showing conductivity, malleability and ductility
D substance releasing usable energy in combustion or another process

Which of the following is most closely associated with alloy?

A mass of one mole of a substance
B mixture or solid solution of metals or metal with another element
C two or more atoms chemically bonded
D atom or group of atoms carrying net electric charge

Which of the following is most closely associated with steel?

A combination of substances retaining their chemical identities
B iron-based alloy containing carbon
C vertical column in the periodic table
D number of protons plus neutrons

Which statement correctly identifies ammonia?

A NH3, basic nitrogen compound used in fertilisers
B solid fossil fuel formed largely from ancient plant matter
C steel containing sufficient chromium for corrosion resistance
D polymer produced from ethene

Which statement correctly identifies litmus?

A substance dissolved in a solution
B sodium chloride
C sodium hydrogen carbonate, NaHCO3
D acid-base indicator red in acid and blue in base

In general science, element refers to:

A liquid hydrocarbon mixture from geological deposits
B pure substance whose atoms have the same atomic number
C substance changing reaction rate without being consumed overall
D reaction between acid and base forming salt and usually water

Which statement correctly identifies sublimation?

A substance releasing usable energy in combustion or another process
B solid-to-gas change without passing through liquid
C substance accepting H+ or producing OH− in water
D gain of electrons or decrease in oxidation state

Which statement correctly identifies monomer?

A separation based mainly on differences in boiling points
B large molecule made of repeating structural units
C small molecule that can form a polymer
D iron-based alloy containing carbon

What is the best description of base?

A reaction absorbing heat
B substance accepting H+ or producing OH− in water
C acid-base indicator red in acid and blue in base
D compressed natural gas, mainly methane

In general science, urea refers to:

A chemical/electrochemical deterioration of a material
B nitrogen fertiliser, CO(NH2)2
C water containing appreciable calcium or magnesium ions
D surface vaporisation below boiling point

Which of the following is most closely associated with noble gases?

A energy barrier associated with a reaction pathway
B fossil fuel consisting mainly of methane
C ionic compound of cations and anions
D Group 18 elements with very low reactivity

In general science, carbon dioxide refers to:

A CO, toxic product of incomplete combustion
B CO2, important greenhouse gas
C calcium sulfate hemihydrate
D an alcohol used in sanitizers, solvents and fuels

Which statement correctly identifies washing soda?

A chemical oxygen demand, oxygen equivalent needed for chemical oxidation of substances in water
B anything having mass and occupying space
C nitrogen fertiliser, CO(NH2)2
D sodium carbonate decahydrate

What is the best description of reduction?

A calcium hydroxide
B temperature at which solid and liquid coexist at specified pressure
C synthetic surfactant used for cleaning
D gain of electrons or decrease in oxidation state

Which of the following is most closely associated with filtration?

A chemical/electrochemical deterioration of a material
B separation of insoluble solids from a fluid using a filter
C synthetic polyamide polymer
D fossil fuel consisting mainly of methane

In general science, plaster of Paris refers to:

A negatively charged ion
B Group 17 elements
C calcium sulfate hemihydrate
D negatively charged subatomic particle

Which statement correctly identifies group?

A material supplying plant nutrients
B vertical column in the periodic table
C combination of substances retaining their chemical identities
D number of protons plus neutrons

What is the best description of electrolyte?

A negatively charged ion
B anything having mass and occupying space
C substance producing ions in solution or molten state
D negatively charged subatomic particle

What is the best description of corrosion?

A NH3, basic nitrogen compound used in fertilisers
B SI amount-of-substance unit containing Avogadro’s number of entities
C acidic precipitation associated mainly with sulfur and nitrogen oxides
D chemical/electrochemical deterioration of a material