3.01 x 1022
6.02 x 1022
3.01 x 1023
6.01 x 1023
Correct answer is B
No explanation has been provided for this answer.
Which of the following is a example of a chemical change?
Dissoultion of salt in water
Rusting of iron
Melting of ice
Separating a mixture by distillation
Correct answer is B
No explanation has been provided for this answer.
Chromatography is used to separate components of mixtures which differ in their rates of?
diffusion
migration
reaction
sedimentaion
Correct answer is B
No explanation has been provided for this answer.
Which of the following reagents will confirm the presence of unsaturation in a compound?
Fehling's solution
Bromine water
Tollen's reagent
Benedict's solution
Correct answer is B
No explanation has been provided for this answer.
One mole of a hydrocarbon contains 48 g of carbon. If it vapour density is 28, the hydrocarbon is?
an alkane
an alkene
an alkyne
aromatic (C = 12, H = 1)
Correct answer is B
No explanation has been provided for this answer.