General Science

In general science, fuel refers to:

A elements generally showing conductivity, malleability and ductility
B substance releasing usable energy in combustion or another process
C energy barrier associated with a reaction pathway
D ionic compound of cations and anions

Which statement correctly identifies NPK fertiliser?

A fluoropolymer known for chemical resistance and low friction
B coating iron or steel with zinc
C fertiliser supplying nitrogen, phosphorus and potassium
D temperature at which vapour pressure equals surrounding pressure

What is the best description of valency?

A ethanoic acid, CH3COOH
B gas absorbing and emitting infrared radiation
C combining capacity of an atom or ion
D calcium hypochlorite-based bleaching/disinfecting material

What is the best description of LPG?

A measure related to hydrogen-ion activity/concentration
B liquefied petroleum gas, mainly propane and butane
C reaction involving oxidation and reduction together
D Group 1 metals other than hydrogen

Which statement correctly identifies alloy?

A calcium sulfate hemihydrate
B an alcohol used in sanitizers, solvents and fuels
C CO2, important greenhouse gas
D mixture or solid solution of metals or metal with another element

Which of the following is most closely associated with indicator?

A substance changing colour over a characteristic pH range
B an alcohol used in sanitizers, solvents and fuels
C CO2, important greenhouse gas
D substance used to control pests

Which statement correctly identifies greenhouse gas?

A component that dissolves the solute
B sodium carbonate decahydrate
C separation based mainly on differences in boiling points
D gas absorbing and emitting infrared radiation

What is the best description of solvent?

A iron-based alloy containing carbon
B component that dissolves the solute
C substance releasing usable energy in combustion or another process
D small molecule that can form a polymer

What is the best description of baking soda?

A amount of solute relative to a specified quantity
B CH4, simplest alkane and major natural-gas component
C sodium hydrogen carbonate, NaHCO3
D calcium sulfate dihydrate

In general science, glass refers to:

A gas absorbing and emitting infrared radiation
B ethanoic acid, CH3COOH
C amorphous inorganic solid commonly based on silica
D material supplying plant nutrients

Which statement correctly identifies solution?

A corrosion product formed mainly on iron/steel
B homogeneous mixture of solute and solvent
C solid-to-gas change without passing through liquid
D water containing appreciable calcium or magnesium ions

Which statement correctly identifies pesticide?

A pure substance whose atoms have the same atomic number
B substance used to control pests
C uncharged subatomic particle
D combining capacity of an atom or ion

Which of the following is most closely associated with activation energy?

A measure related to hydrogen-ion activity/concentration
B Group 1 metals other than hydrogen
C positively charged ion
D energy barrier associated with a reaction pathway

What is the best description of quicklime?

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

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