Chemistry JAMB - Page 19 of 160

$Which of the following can be obtained by fractional distillation?$

Which of the following can be obtained by fractional distillation?

A. Nitrogen from liquid air B. Sodium Chloride from sea water C. Iodine from a solution of Iodine in carbon tetrachloride D. Sulphur from the solution of sulphur in carbon disulphide Correct Answer: Option A = Nitrogen from liquid air Explanation distillation is used...

$Which of the following can be obtained by fractional distillation?$

The electronic configuration of an element is 1S² 2S² 2P6 3S² 3P³. How many unpaired electrons are there in the element?

by Sunday | Mar 19 | Chemistry JAMB

A. 5 B. 4 C. 3 D. 2 Correct Answer: Option C = 3 Explanation Once you figure out the electron configuration, you fill up the corresponding orbitals with electrons, any left with one is considered unpaired. Since 1s can only hold 2 electrons, and P has 15, that’s...

$Which of the following can be obtained by fractional distillation?$

A secondary alkanol can be oxidized to give an?

by Sunday | Mar 19 | Chemistry JAMB

A. alkanone B. alkyne C. alkanoic acid D. alkanal Correct Answer: Option A – alkanone Explanation Secondary alkanols (alcohols) can be oxidised to alkanones (ketones)

$Which of the following can be obtained by fractional distillation?$

Which of the following oxides has a giant covalent structure?

by Sunday | Mar 18 | Chemistry JAMB

A. Al2O3 B. Na2O C. P4O10 D. SiO2 Correct Answer: Option D = SiO2 Explanation – Silicon dioxide is an example of a substance with a giant covalent structure . It contains many silicon and oxygen atoms. All the atoms in its structure are linked to each other by...