General Science

What is the best description of mixture?

A elements generally lacking typical metallic properties
B arrangement of elements by atomic number and recurring properties
C substance changing colour over a characteristic pH range
D combination of substances retaining their chemical identities

In general science, ozone refers to:

A O3, allotrope of oxygen
B sodium chloride
C substance dissolved in a solution
D sodium hydrogen carbonate, NaHCO3

Which of the following is most closely associated with sublimation?

A polymer produced from ethene
B steel containing sufficient chromium for corrosion resistance
C separation of insoluble solids from a fluid using a filter
D solid-to-gas change without passing through liquid

What is the best description of urea?

A substance changing reaction rate without being consumed overall
B liquid hydrocarbon mixture from geological deposits
C nitrogen fertiliser, CO(NH2)2
D polyvinyl chloride polymer

In general science, slaked lime refers to:

A energy barrier associated with a reaction pathway
B elements generally showing conductivity, malleability and ductility
C calcium hydroxide
D ionic compound of cations and anions

Which of the following is most closely associated with proton?

A positively charged subatomic particle
B water containing appreciable calcium or magnesium ions
C surface vaporisation below boiling point
D calcium sulfate dihydrate

In general science, coal refers to:

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

Which of the following is most closely associated with bleaching powder?

A Group 1 metals other than hydrogen
B measure related to hydrogen-ion activity/concentration
C positively charged ion
D calcium hypochlorite-based bleaching/disinfecting material

Which of the following is most closely associated with slaked lime?

A gain of electrons or decrease in oxidation state
B small molecule that can form a polymer
C calcium hydroxide
D substance releasing usable energy in combustion or another process

What is the best description of electron?

A energy barrier associated with a reaction pathway
B negatively charged subatomic particle
C synthetic polyamide polymer
D fossil fuel consisting mainly of methane

In general science, mixture refers to:

A compressed natural gas, mainly methane
B reaction absorbing heat
C amorphous inorganic solid commonly based on silica
D combination of substances retaining their chemical identities

In general science, electrolysis refers to:

A acid-base indicator red in acid and blue in base
B elements showing intermediate metal/non-metal properties
C chemical decomposition driven by electric current
D vertical column in the periodic table

Which of the following is most closely associated with periodic table?

A Group 17 elements
B positively charged ion
C reaction between acid and base forming salt and usually water
D arrangement of elements by atomic number and recurring properties

In general science, electron refers to:

A temperature at which vapour pressure equals surrounding pressure
B salts of higher fatty acids
C coating iron or steel with zinc
D negatively charged subatomic particle

What is the best description of pH?

A energy barrier associated with a reaction pathway
B measure related to hydrogen-ion activity/concentration
C synthetic polyamide polymer
D fossil fuel consisting mainly of methane

In general science, vinegar refers to:

A loss of electrons or increase in oxidation state
B large molecule made of repeating structural units
C aqueous solution containing acetic acid
D rapid reaction with an oxidant commonly releasing heat

What is the best description of acetic acid?

A ionic compound of cations and anions
B elements generally showing conductivity, malleability and ductility
C ethanoic acid, CH3COOH
D combining capacity of an atom or ion

In general science, metals refers to:

A gain of electrons or decrease in oxidation state
B small molecule that can form a polymer
C elements generally showing conductivity, malleability and ductility
D substance releasing usable energy in combustion or another process

Which of the following is most closely associated with alloy?

A mass of one mole of a substance
B mixture or solid solution of metals or metal with another element
C two or more atoms chemically bonded
D atom or group of atoms carrying net electric charge

Which of the following is most closely associated with steel?

A combination of substances retaining their chemical identities
B iron-based alloy containing carbon
C vertical column in the periodic table
D number of protons plus neutrons

Which statement correctly identifies ammonia?

A NH3, basic nitrogen compound used in fertilisers
B solid fossil fuel formed largely from ancient plant matter
C steel containing sufficient chromium for corrosion resistance
D polymer produced from ethene

Which statement correctly identifies litmus?

A substance dissolved in a solution
B sodium chloride
C sodium hydrogen carbonate, NaHCO3
D acid-base indicator red in acid and blue in base

In general science, element refers to:

A liquid hydrocarbon mixture from geological deposits
B pure substance whose atoms have the same atomic number
C substance changing reaction rate without being consumed overall
D reaction between acid and base forming salt and usually water

Which statement correctly identifies sublimation?

A substance releasing usable energy in combustion or another process
B solid-to-gas change without passing through liquid
C substance accepting H+ or producing OH− in water
D gain of electrons or decrease in oxidation state

What is the best description of Rh factor?

A disorder characterised by chronic high blood glucose
B macronutrient made of amino acids
C blood-group antigen system important in transfusion and pregnancy
D viral disease mainly transmitted by Aedes mosquitoes