Cu and Sn
Cu and Zn
Cu and Mg
Cu and Pb
Correct answer is B
Brass is an alloy made from copper and zinc. Unlike pure metals, most alloys do not have a single melting point, but a melting range in which the material is a mixture of solid and liquid phases.
A metal that is widely used in the manufacture of paints and overhead electric cables is
aluminium
copper
iron
lead
Correct answer is A
No explanation has been provided for this answer.
Which of the following pollutants is not usually recycled?
Aluminium cans
Glass bottles
Nuclear wastes
Paper wastes
Correct answer is C
No explanation has been provided for this answer.
Which of the following industrial processes depends on the action of enzymes?
Liquefaction of air
Manufacture of soap
Brewing of beer
Catalytic cracking
Correct answer is C
The brewing of beer has to do with fermentation.
(CH 3)2CHCH2OH
CH3CH2CH(OH)CH3
(CH3)3COH
CH3CH2CH2CH2OH
Correct answer is C
No explanation has been provided for this answer.