BUK Chemistry 2019/2020 Past Questions

Practice each question, then open it to see the full details.

The properties of electrovalent compounds include the following except

A.high melting point and boiling point
B.conduction of electricity in the molten state
C.high vitality at room temperature
D.ionization in aqueous solution

Alkanoates are produced from alkanols by

A.etherification
B.fermentation
C.saponification
D.oxidation

What mass of water is produced when 8.0g of hydrogen reacts with excess oxygen?
(H = 1, O = 16)

A.36.0g
B.8.0g
C.72.0g
D.16.0g

The components present in the alloy used for welding and plumbing are

A.lead and tin
B.lead and antimony
C.iron and aluminium
D.copper and tin

The products of photochlorination of ethanoic acid are ..........

A.CH₃OOCL+HCL
B. CH₃COCL+HOCL
C.CLCH₂COCL+HCL
D.CLCH₂+HCL

A measure of the degree of disorderliness in a chemical system is known as

A.enthalpy
B.entropy
C.free energy
D.activation energy

Alkanals can be distinguished from alkanones by the reaction with

A.sudan III stain
B.starch iodide paper
C.lithium tetrahydrido aluminate(III)
D.Fehling's solution

Reduction is the process of

A.loss of electron
B.loss of hydrogen
C.loss of oxygen
D.addition of electronegative elements

The oxidation state of S in Ca(HSO₃)₂ is ..........

A.+2
B.-2
C.+4
D.-4

Copper oxide is heated with charcoal to produce carbon monoxide and copper. The reaction is an example of

A.both oxidation and reduction
B.neither oxidation and reduction
C.oxidation only
D.reduction only