General Science

Which of the following is most closely associated with ion?

A chemical oxygen demand, oxygen equivalent needed for chemical oxidation of substances in water
B anything having mass and occupying space
C atom or group of atoms carrying net electric charge
D negatively charged subatomic particle

In general science, molar mass refers to:

A acid-base indicator red in acid and blue in base
B vertical column in the periodic table
C elements showing intermediate metal/non-metal properties
D mass of one mole of a substance

In general science, metalloids refers to:

A synthetic polyamide polymer
B chemical/electrochemical deterioration of a material
C fossil fuel consisting mainly of methane
D elements showing intermediate metal/non-metal properties

In general science, PVC refers to:

A component that dissolves the solute
B polyvinyl chloride polymer
C sodium carbonate decahydrate
D aqueous solution containing acetic acid

Which statement correctly identifies ozone?

A corrosion product formed mainly on iron/steel
B amount of solute relative to a specified quantity
C O3, allotrope of oxygen
D solid-to-gas change without passing through liquid

Which statement correctly identifies stainless steel?

A anything having mass and occupying space
B chemical oxygen demand, oxygen equivalent needed for chemical oxidation of substances in water
C steel containing sufficient chromium for corrosion resistance
D nitrogen fertiliser, CO(NH2)2

Which statement correctly identifies exothermic reaction?

A combination of substances retaining their chemical identities
B material supplying plant nutrients
C reaction releasing heat
D number of protons plus neutrons

What is the best description of salt?

A ionic compound of cations and anions
B mixture or solid solution of metals or metal with another element
C large molecule made of repeating structural units
D substance producing ions in solution or molten state

Which of the following is most closely associated with neutron?

A uncharged subatomic particle
B sodium hydrogen carbonate, NaHCO3
C fertiliser supplying nitrogen, phosphorus and potassium
D sodium chloride

In general science, ammonia refers to:

A temperature at which solid and liquid coexist at specified pressure
B NH3, basic nitrogen compound used in fertilisers
C amorphous inorganic solid commonly based on silica
D chemical decomposition driven by electric current

What is the best description of oxidation?

A separation based mainly on differences in boiling points
B loss of electrons or increase in oxidation state
C component that dissolves the solute
D sodium carbonate decahydrate

Which of the following is most closely associated with natural gas?

A corrosion product formed mainly on iron/steel
B solid-to-gas change without passing through liquid
C polyvinyl chloride polymer
D fossil fuel consisting mainly of methane

Which of the following is most closely associated with hard water?

A water containing appreciable calcium or magnesium ions
B pure substance formed by chemical combination of elements in fixed proportions
C O3, allotrope of oxygen
D methods such as painting, galvanising or alloying that reduce corrosion

Which statement correctly identifies natural gas?

A fossil fuel consisting mainly of methane
B substance releasing usable energy in combustion or another process
C substance accepting H+ or producing OH− in water
D gain of electrons or decrease in oxidation state

Which statement correctly identifies mass number?

A calcium hypochlorite-based bleaching/disinfecting material
B separation of insoluble solids from a fluid using a filter
C homogeneous mixture of solute and solvent
D number of protons plus neutrons

Which of the following is most closely associated with period?

A reaction absorbing heat
B horizontal row in the periodic table
C acid-base indicator red in acid and blue in base
D elements showing intermediate metal/non-metal properties

What is the best description of PTFE/Teflon?

A corrosion product formed mainly on iron/steel
B amount of solute relative to a specified quantity
C fluoropolymer known for chemical resistance and low friction
D solid-to-gas change without passing through liquid

Which of the following is most closely associated with solute?

A calcium hypochlorite-based bleaching/disinfecting material
B substance dissolved in a solution
C homogeneous mixture of solute and solvent
D ethanoic acid, CH3COOH

Which of the following is most closely associated with solvent?

A sodium chloride
B component that dissolves the solute
C sodium hydrogen carbonate, NaHCO3
D fertiliser supplying nitrogen, phosphorus and potassium

What is the best description of alkali metals?

A negatively charged ion
B anything having mass and occupying space
C negatively charged subatomic particle
D Group 1 metals other than hydrogen

In general science, steel refers to:

A acidic precipitation associated mainly with sulfur and nitrogen oxides
B SI amount-of-substance unit containing Avogadro’s number of entities
C iron-based alloy containing carbon
D positively charged subatomic particle

What is the best description of electrolysis?

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

Which statement correctly identifies atomic number?

A chemical/electrochemical deterioration of a material
B surface vaporisation below boiling point
C number of protons in the nucleus
D water containing appreciable calcium or magnesium ions

Which statement correctly identifies baking soda?

A methods such as painting, galvanising or alloying that reduce corrosion
B sodium hydrogen carbonate, NaHCO3
C aqueous solution containing acetic acid
D O3, allotrope of oxygen

Which statement correctly identifies hard water?

A sodium hydrogen carbonate, NaHCO3
B temperature at which solid and liquid coexist at specified pressure
C water containing appreciable calcium or magnesium ions
D sodium chloride