General Science

What is the best description of acid rain?

A calcium oxide
B temperature at which vapour pressure equals surrounding pressure
C salts of higher fatty acids
D acidic precipitation associated mainly with sulfur and nitrogen oxides

Which statement correctly identifies polymer?

A corrosion product formed mainly on iron/steel
B solid fossil fuel formed largely from ancient plant matter
C polyvinyl chloride polymer
D large molecule made of repeating structural units

Which of the following is most closely associated with redox reaction?

A vertical column in the periodic table
B combination of substances retaining their chemical identities
C number of protons plus neutrons
D reaction involving oxidation and reduction together

What is the best description of fuel?

A negatively charged ion
B negatively charged subatomic particle
C anything having mass and occupying space
D substance releasing usable energy in combustion or another process

Which of the following is most closely associated with NPK fertiliser?

A calcium hydroxide
B fertiliser supplying nitrogen, phosphorus and potassium
C nitrogen fertiliser, CO(NH2)2
D synthetic surfactant used for cleaning

Which statement correctly identifies halogens?

A elements showing intermediate metal/non-metal properties
B acid-base indicator red in acid and blue in base
C arrangement of elements by atomic number and recurring properties
D Group 17 elements

What is the best description of periodic table?

A fertiliser supplying nitrogen, phosphorus and potassium
B biochemical oxygen demand, oxygen consumed by microbes decomposing organic matter in water
C sodium chloride
D arrangement of elements by atomic number and recurring properties

Which of the following is most closely associated with ammonia?

A amount of solute relative to a specified quantity
B calcium sulfate hemihydrate
C NH3, basic nitrogen compound used in fertilisers
D solid-to-gas change without passing through liquid

Which of the following is most closely associated with melting point?

A temperature at which solid and liquid coexist at specified pressure
B calcium sulfate dihydrate
C solid-to-gas change without passing through liquid
D water containing appreciable calcium or magnesium ions

What is the best description of slaked lime?

A negatively charged ion
B negatively charged subatomic particle
C calcium hydroxide
D anything having mass and occupying space

What is the best description of pesticide?

A material supplying plant nutrients
B substance used to control pests
C smallest unit of an element retaining its chemical identity
D gas absorbing and emitting infrared radiation

Which statement correctly identifies solvent?

A coating iron or steel with zinc
B temperature at which vapour pressure equals surrounding pressure
C fluoropolymer known for chemical resistance and low friction
D component that dissolves the solute

What is the best description of CNG?

A substance donating H+ in Brønsted-Lowry theory
B loss of electrons or increase in oxidation state
C compressed natural gas, mainly methane
D rapid reaction with an oxidant commonly releasing heat

In general science, soap refers to:

A ethanoic acid, CH3COOH
B material supplying plant nutrients
C gas absorbing and emitting infrared radiation
D salts of higher fatty acids

Which statement correctly identifies CNG?

A compressed natural gas, mainly methane
B energy barrier associated with a reaction pathway
C fossil fuel consisting mainly of methane
D fluoropolymer known for chemical resistance and low friction

Which of the following is most closely associated with cation?

A positively charged ion
B atom or group of atoms carrying net electric charge
C mass of one mole of a substance
D two or more atoms chemically bonded

In general science, isotope refers to:

A CO, toxic product of incomplete combustion
B atoms of the same element with different neutron numbers
C CH4, simplest alkane and major natural-gas component
D calcium sulfate dihydrate

In general science, mole refers to:

A SI amount-of-substance unit containing Avogadro’s number of entities
B ionic compound of cations and anions
C energy barrier associated with a reaction pathway
D elements generally showing conductivity, malleability and ductility

In general science, alloy refers to:

A mixture or solid solution of metals or metal with another element
B fertiliser supplying nitrogen, phosphorus and potassium
C biochemical oxygen demand, oxygen consumed by microbes decomposing organic matter in water
D pure substance whose atoms have the same atomic number

In general science, base refers to:

A substance producing ions in solution or molten state
B mixture or solid solution of metals or metal with another element
C substance dissolved in a solution
D substance accepting H+ or producing OH− in water

In general science, pesticide refers to:

A Group 18 elements with very low reactivity
B substance used to control pests
C substance accepting H+ or producing OH− in water
D atom or group of atoms carrying net electric charge

What is the best description of molecule?

A substance accepting H+ or producing OH− in water
B two or more atoms chemically bonded
C substance releasing usable energy in combustion or another process
D gain of electrons or decrease in oxidation state

What is the best description of anion?

A CH4, simplest alkane and major natural-gas component
B negatively charged ion
C water containing appreciable calcium or magnesium ions
D calcium sulfate dihydrate

Which statement correctly identifies rust prevention?

A CO2, important greenhouse gas
B methods such as painting, galvanising or alloying that reduce corrosion
C mass of one mole of a substance
D two or more atoms chemically bonded

What is the best description of sublimation?

A combining capacity of an atom or ion
B solid-to-gas change without passing through liquid
C ionic compound of cations and anions
D elements generally showing conductivity, malleability and ductility