General Science

Which of the following is most closely associated with reduction?

A gain of electrons or decrease in oxidation state
B mass of one mole of a substance
C atom or group of atoms carrying net electric charge
D two or more atoms chemically bonded

What is the best description of plaster of Paris?

A calcium sulfate hemihydrate
B NH3, basic nitrogen compound used in fertilisers
C acidic precipitation associated mainly with sulfur and nitrogen oxides
D SI amount-of-substance unit containing Avogadro’s number of entities

In general science, galvanisation refers to:

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

In general science, noble gases refers to:

A vertical column in the periodic table
B loss of electrons or increase in oxidation state
C substance donating H+ in Brønsted-Lowry theory
D Group 18 elements with very low reactivity

Which of the following is most closely associated with detergent?

A two or more atoms chemically bonded
B mass of one mole of a substance
C atom or group of atoms carrying net electric charge
D synthetic surfactant used for cleaning

Which of the following is most closely associated with oxidation?

A negatively charged subatomic particle
B anything having mass and occupying space
C loss of electrons or increase in oxidation state
D chemical oxygen demand, oxygen equivalent needed for chemical oxidation of substances in water

Which statement correctly identifies evaporation?

A acid-base indicator red in acid and blue in base
B surface vaporisation below boiling point
C compressed natural gas, mainly methane
D reaction absorbing heat

In general science, acid rain refers to:

A acidic precipitation associated mainly with sulfur and nitrogen oxides
B biochemical oxygen demand, oxygen consumed by microbes decomposing organic matter in water
C pure substance whose atoms have the same atomic number
D nitrogen fertiliser, CO(NH2)2

In general science, oxidation refers to:

A loss of electrons or increase in oxidation state
B ethanoic acid, CH3COOH
C gas absorbing and emitting infrared radiation
D material supplying plant nutrients

What is the best description of bleaching powder?

A calcium hypochlorite-based bleaching/disinfecting material
B fertiliser supplying nitrogen, phosphorus and potassium
C sodium chloride
D biochemical oxygen demand, oxygen consumed by microbes decomposing organic matter in water

What is the best description of soap?

A substance producing ions in solution or molten state
B salts of higher fatty acids
C substance dissolved in a solution
D sodium carbonate decahydrate

In general science, natural gas refers to:

A fossil fuel consisting mainly of methane
B amorphous inorganic solid commonly based on silica
C reaction releasing heat
D compressed natural gas, mainly methane

In general science, anion refers to:

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

Which statement correctly identifies atom?

A smallest unit of an element retaining its chemical identity
B large molecule made of repeating structural units
C rapid reaction with an oxidant commonly releasing heat
D loss of electrons or increase in oxidation state

Which of the following is most closely associated with group?

A vertical column in the periodic table
B substance accepting H+ or producing OH− in water
C Group 18 elements with very low reactivity
D gain of electrons or decrease in oxidation state

In general science, cation refers to:

A positively charged ion
B fertiliser supplying nitrogen, phosphorus and potassium
C pure substance whose atoms have the same atomic number
D biochemical oxygen demand, oxygen consumed by microbes decomposing organic matter in water

In general science, litmus refers to:

A CH4, simplest alkane and major natural-gas component
B calcium sulfate dihydrate
C acid-base indicator red in acid and blue in base
D CO, toxic product of incomplete combustion

What is the best description of isotope?

A amount of solute relative to a specified quantity
B atoms of the same element with different neutron numbers
C corrosion product formed mainly on iron/steel
D solid-to-gas change without passing through liquid

Which of the following is most closely associated with litmus?

A methods such as painting, galvanising or alloying that reduce corrosion
B acid-base indicator red in acid and blue in base
C O3, allotrope of oxygen
D pure substance formed by chemical combination of elements in fixed proportions

Which of the following is most closely associated with washing soda?

A uncharged subatomic particle
B elements generally showing conductivity, malleability and ductility
C combining capacity of an atom or ion
D sodium carbonate decahydrate

In general science, electrolyte refers to:

A elements generally showing conductivity, malleability and ductility
B energy barrier associated with a reaction pathway
C ionic compound of cations and anions
D substance producing ions in solution or molten state

Which statement correctly identifies pH?

A separation based mainly on differences in boiling points
B small molecule that can form a polymer
C iron-based alloy containing carbon
D measure related to hydrogen-ion activity/concentration

Which of the following is most closely associated with neutralisation?

A sodium hydrogen carbonate, NaHCO3
B fertiliser supplying nitrogen, phosphorus and potassium
C reaction between acid and base forming salt and usually water
D sodium chloride

In general science, group refers to:

A vertical column in the periodic table
B negatively charged ion
C negatively charged subatomic particle
D elements generally showing conductivity, malleability and ductility

In general science, nylon refers to:

A synthetic polyamide polymer
B synthetic surfactant used for cleaning
C calcium hydroxide
D nitrogen fertiliser, CO(NH2)2