The periodic table is an arrangement of elements according to their?
Oxidation number
Atomic number
Mass number
Number of neutrons
Correct answer is B
Elements are arranged in order of increasing atomic number
Which of the following is a physical change?
Exposing white phosphorus to air
Burning kerosene
Dissolving calcium in water
Freezing ice cream
Correct answer is D
No explanation has been provided for this answer.
Which of the following will give a precipitate with an aqueous solution of copper (I) chloride?
But-2-ene
But-1-ene
But-2-yne
But-1-yne
Correct answer is D
No explanation has been provided for this answer.
A secondary alkanol can be oxidized to give an?
alkanone
alkyne
alkanoic acid
alkanal
Correct answer is A
Secondary alkanols (alcohols) can be oxidised to alkanones (ketones)
Petroleum is a non-renewable source of energy because it
is formed naturally
is cheap
can be recycled after use
cannot be regenerated once used up
Correct answer is D
No explanation has been provided for this answer.