Learn more about the properties, composition, and structure of substances (elements and compounds) with these Chemistry questions and answers. This Test can be used by students preparing for Chemistry in JAMB, WAEC, NECO or Post UTME.
The chlorinated alkane often used industrially to remove grease is
tetrachloromethane
chloromethane
trichloromethane
dichlorometane
Correct answer is A
No explanation has been provided for this answer.
The conditions necessary for the extraction of a water molecule from two molecules of ethanol are
less acid and lower temperature
excess acid and a lower temperature
excess acid and a higher temperature
less acid and a higher temperature
Correct answer is A
- The formation of ethoxyethane ( a sweet smelling liquid) can be considered a dehydration reaction
- This is because the overall reaction is the loss of one molecule of water from two molecules of ethanol
- If the alkanol is in excess instead of the acid in excess, and the temperature is lower.
Unsaturated organic compounds are identified by decolourization of
silver bromine and potassium tetraoxomanganate (VII) solutions
bromine water and acidified potassium tetraoxomanganate (VII) solution
silver bromide solution and bromine water
bromine water and alkaline potassium tetraoxomanganate (VII) solution
Correct answer is B
No explanation has been provided for this answer.
The repeating unit in natural rubber is
alkyne
isoprene
n-propene
peoprene
Correct answer is B
No explanation has been provided for this answer.
The least easily oxidized of the metals below is?
Ca
Na
Zn
Al
Correct answer is C
The activity series is a type of ordering system for elements, which ranks how reactive a certain element is in relation to other elements. The order of reactivity of metals is as follows, Potassium > Sodium > Lithium > Calcium > Magnesium > Aluminium > Zinc > Iron > Copper >