General Science

Which statement correctly identifies melting point?

A solid fossil fuel formed largely from ancient plant matter
B steel containing sufficient chromium for corrosion resistance
C polymer produced from ethene
D temperature at which solid and liquid coexist at specified pressure

In general science, endothermic reaction refers to:

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

In general science, polymer refers to:

A substance dissolved in a solution
B large molecule made of repeating structural units
C mixture or solid solution of metals or metal with another element
D substance producing ions in solution or molten state

Which statement correctly identifies indicator?

A homogeneous mixture of solute and solvent
B calcium hypochlorite-based bleaching/disinfecting material
C separation of insoluble solids from a fluid using a filter
D substance changing colour over a characteristic pH range

In general science, CNG refers to:

A separation of insoluble solids from a fluid using a filter
B compressed natural gas, mainly methane
C steel containing sufficient chromium for corrosion resistance
D polymer produced from ethene

Which of the following is most closely associated with compound?

A pure substance formed by chemical combination of elements in fixed proportions
B liquefied petroleum gas, mainly propane and butane
C fluoropolymer known for chemical resistance and low friction
D coating iron or steel with zinc

What is the best description of metals?

A number of protons plus neutrons
B vertical column in the periodic table
C elements generally showing conductivity, malleability and ductility
D substance donating H+ in Brønsted-Lowry theory

Which of the following is most closely associated with ethanol?

A substance dissolved in a solution
B an alcohol used in sanitizers, solvents and fuels
C substance producing ions in solution or molten state
D mixture or solid solution of metals or metal with another element

What is the best description of NPK fertiliser?

A iron-based alloy containing carbon
B small molecule that can form a polymer
C fertiliser supplying nitrogen, phosphorus and potassium
D substance releasing usable energy in combustion or another process

In general science, carbon monoxide refers to:

A aqueous solution containing acetic acid
B material supplying plant nutrients
C CO, toxic product of incomplete combustion
D O3, allotrope of oxygen

Which statement correctly identifies metalloids?

A loss of electrons or increase in oxidation state
B large molecule made of repeating structural units
C rapid reaction with an oxidant commonly releasing heat
D elements showing intermediate metal/non-metal properties

Which of the following is most closely associated with solution?

A calcium oxide
B acidic precipitation associated mainly with sulfur and nitrogen oxides
C homogeneous mixture of solute and solvent
D NH3, basic nitrogen compound used in fertilisers

What is the best description of solution?

A homogeneous mixture of solute and solvent
B compressed natural gas, mainly methane
C chemical decomposition driven by electric current
D amorphous inorganic solid commonly based on silica

Which statement correctly identifies periodic table?

A CO, toxic product of incomplete combustion
B two or more atoms chemically bonded
C mass of one mole of a substance
D arrangement of elements by atomic number and recurring properties

Which of the following is most closely associated with acid rain?

A mass of one mole of a substance
B two or more atoms chemically bonded
C atom or group of atoms carrying net electric charge
D acidic precipitation associated mainly with sulfur and nitrogen oxides

Which statement correctly identifies anion?

A methods such as painting, galvanising or alloying that reduce corrosion
B negatively charged ion
C O3, allotrope of oxygen
D aqueous solution containing acetic acid

Which of the following is most closely associated with PTFE/Teflon?

A pure substance formed by chemical combination of elements in fixed proportions
B methods such as painting, galvanising or alloying that reduce corrosion
C O3, allotrope of oxygen
D fluoropolymer known for chemical resistance and low friction

Which of the following is most closely associated with pH?

A calcium hypochlorite-based bleaching/disinfecting material
B homogeneous mixture of solute and solvent
C ethanoic acid, CH3COOH
D measure related to hydrogen-ion activity/concentration

What is the best description of neutralisation?

A reaction between acid and base forming salt and usually water
B steel containing sufficient chromium for corrosion resistance
C solid fossil fuel formed largely from ancient plant matter
D polymer produced from ethene

Which of the following is most closely associated with element?

A large molecule made of repeating structural units
B pure substance whose atoms have the same atomic number
C mixture or solid solution of metals or metal with another element
D rapid reaction with an oxidant commonly releasing heat

What is the best description of stainless steel?

A calcium hypochlorite-based bleaching/disinfecting material
B ethanoic acid, CH3COOH
C steel containing sufficient chromium for corrosion resistance
D gas absorbing and emitting infrared radiation

Which of the following is most closely associated with valency?

A elements generally lacking typical metallic properties
B uncharged subatomic particle
C arrangement of elements by atomic number and recurring properties
D combining capacity of an atom or ion

Which of the following is most closely associated with petroleum?

A liquid hydrocarbon mixture from geological deposits
B coating iron or steel with zinc
C liquefied petroleum gas, mainly propane and butane
D fluoropolymer known for chemical resistance and low friction

What is the best description of endothermic reaction?

A reaction absorbing heat
B CO2, important greenhouse gas
C substance used to control pests
D smallest unit of an element retaining its chemical identity

Which statement correctly identifies noble gases?

A positively charged subatomic particle
B Group 17 elements
C Group 18 elements with very low reactivity
D positively charged ion