General Science

In general science, alkali metals refers to:

A substance changing colour over a characteristic pH range
B Group 1 metals other than hydrogen
C elements generally lacking typical metallic properties
D reaction releasing heat

What is the best description of carbon dioxide?

A CO2, important greenhouse gas
B separation of insoluble solids from a fluid using a filter
C homogeneous mixture of solute and solvent
D steel containing sufficient chromium for corrosion resistance

Which of the following is most closely associated with matter?

A solid fossil fuel formed largely from ancient plant matter
B polymer produced from ethene
C anything having mass and occupying space
D reaction involving oxidation and reduction together

In general science, acetic acid refers to:

A fluoropolymer known for chemical resistance and low friction
B ethanoic acid, CH3COOH
C liquefied petroleum gas, mainly propane and butane
D reaction releasing heat

Which statement correctly identifies neutron?

A amorphous inorganic solid commonly based on silica
B uncharged subatomic particle
C temperature at which solid and liquid coexist at specified pressure
D chemical decomposition driven by electric current

Which statement correctly identifies detergent?

A calcium sulfate hemihydrate
B CO2, important greenhouse gas
C an alcohol used in sanitizers, solvents and fuels
D synthetic surfactant used for cleaning

Which statement correctly identifies ion?

A salts of higher fatty acids
B NH3, basic nitrogen compound used in fertilisers
C atom or group of atoms carrying net electric charge
D calcium oxide

What is the best description of evaporation?

A surface vaporisation below boiling point
B reaction involving oxidation and reduction together
C Group 1 metals other than hydrogen
D measure related to hydrogen-ion activity/concentration

In general science, common salt refers to:

A reaction involving oxidation and reduction together
B solid fossil fuel formed largely from ancient plant matter
C measure related to hydrogen-ion activity/concentration
D sodium chloride

Which statement correctly identifies bleaching powder?

A two or more atoms chemically bonded
B calcium hypochlorite-based bleaching/disinfecting material
C CO, toxic product of incomplete combustion
D mass of one mole of a substance

Which statement correctly identifies oxidation?

A calcium oxide
B salts of higher fatty acids
C NH3, basic nitrogen compound used in fertilisers
D loss of electrons or increase in oxidation state

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