Vulcanization of rubber is a process by which
isoprene units are joined to produce rubber
rubber latex is coagulated
sulphur is chemically combined in the rubber
water is removed from the rubber
Correct answer is C
No explanation has been provided for this answer.
When excess chlorine is mixed with ethene at room temperature, the product is
1,2 - dichloroethane
1,2 - dichloroethene
1,1 - dichloroethane
1, 1 - dichloroethene
Correct answer is A
No explanation has been provided for this answer.
Which of the following is NOT involved in the extraction of metals from their ores?
reduction with carbon
reduction with other metals
reduction by electrolysis
oxidation with oxidizing agents
Correct answer is D
No explanation has been provided for this answer.
Mortar is NOT used for under-water construction because
it hardens by lose of water
its hardening doe not depend upon evaporation
it requires concrete to harden
it will be washed away by the flow of water
Correct answer is A
No explanation has been provided for this answer.
copper
aluminium
zinc
sodium
Correct answer is D
No explanation has been provided for this answer.