When naphthalene on heating changes from the solid state directly to the gaseous state it undergoes
evaporation
sublimation
decomposition
combustion
ionisation
Correct answer is B
No explanation has been provided for this answer.
Calcium is usually extracted by the electrolysis of its
trioxonitrate (V)
tetraoxosulphate (IV)
oxide
hydride
chloride
Correct answer is E
No explanation has been provided for this answer.
Polyatomicity is illustrated by molecules of
sulphur
carbon (IV) oxide
noble gases
liquefied oxygen
liquefied nitrogen
Correct answer is A
No explanation has been provided for this answer.
The following will decolourize acidified potassium tetraoxomanganate (VII) solution except
sulphur (lV) oxide
but-3-ene
pentane
hydrogen sulphide
propyne
Correct answer is C
No explanation has been provided for this answer.
Tetraoxosulphate (lV) acid is described as strong acid because it is highly
corrosive
concentrated
reactive
soluble in water
ionized in water
Correct answer is E
No explanation has been provided for this answer.