Jamb 2020

Question 1

Duralumin is an alloy of?

Answer 1

Aluminum, manganese, copper, magnesium

Question 2

What are polysaccharides?

Answer 2

Polysaccharides are long chain of monosaccharides linked together by glycosidic bonds eg starch, glycogen, and cellulose are composed of glucose

Question 3

CaC + H20 will give

Answer 3

CaC + H2O -> Ca(OH)2 + C2H2

Question 4

The thermal decomposition of NH4NO3 will give

Answer 4

NH4NO3 -> N2O + H20

Question 5

Does N2O rekindle a glowing splint?

Answer 5

Nitrogen(I)Oxide rekindles a brightly glowing splinter but extinguishes a feebly glowing one which is not hot enough to decompose the gas to liberate oxygen.

Question 6

The heat of solution has unit?

Answer 6

kJ/mol

Question 7

An organic compound that does not undergo a reaction with both hydrogen cyanide and hydroxylamine can be?

A. Alkene
B. Alkanal
C. Alkanone
D. Alkanoic Acid

Answer 7

A

Question 8

Proteins in acid solution undergo?

Answer 8

Hydrolysis

Acid hydrolysis refers to a hydrolysis reaction occurring under acidic conditions. Acid hydrolysis of a protein breaks the polymer down into its constituent amino acids.

Question 9

Aluminum hydroxide is used in the dyeing industry as a?

Answer 9

Mordant

Question 10

The most important element on the earth’s crust is?

Answer 10

Oxygen

Question 11

To obtain pure carbon(ii)oxide from its mixture with carbon(iv)oxide, the mixture should be?

Answer 11

passing the latter through red-hot carbon and the unchanged CO2
is removed when the mixture of the gases through conc NAOH.