Chemistry JAMB, WAEC, NECO AND NABTEB Official Past Questions

An example of oxidation – reduction enzyme is

Ethanol reacts with concentrated tetraoxosulphate (VI) acid at a temperature above 170 oC to form

2 – methyl propan -2- ol is an example of a

The saponification of an alkanoate to produce soap and alkanol involves

A compound contains 40.0% C, 6.7% H 53.3% O. If the molecular mass of the compound is 180, its molecular formula is [C =12, H =1,O]

Carbohydrates are large molecules with the molecular formula C\(_x\)(H\(_2\)O)\(_y\). In which of the following pairs is x not equal to y?

The isomers of C₃H₈O ARE

Alkanals can be distinguished from alkanones by the reaction with

Geometric isomerism can exist in

Which of the following metals is the least reactive?

A common characteristic between zinc and the other transition elements is the ability to

The purest form of iron which contains only about 0.1% carbon is

Which of the following compounds will burn with a brick-red colour in a non-luminous Bunsen flame?

Mineral acids are usually added to commercial hydrogen peroxide to

Commercial bleaching can be carried out using

Which of the following gases has a characteristic pungent smell, turns red litmus paper blue and forms dense white fumes with hydrogen chloride gas?

A piece of filter paper moistened with lead (ll) ethanoate solution turns black when the paper is dropped into a gas likely to be

The highest rate of production of carbon (lV) oxide can be achieved using

An increase in entropy can best be illustrated by

CO(g) + H\(_2\) O\(_{(g)}\) → CO\(_{2(g)}\) + H\(_{2(g)}\)
Calculate the standard heat change of the reaction above, if the standard enthalpies of formation of CO\(_{2(g)}\), H\(_2\)O\(_{(g)}\) and CO\(_{(g)}\) in kJmol\(^{-1}\) are – 394, -242 and – 110 respectively.

A metal M displaces zinc from ZnCl solution
This shows that