Commercial bleaching can be carried out using

A. sulphur (IV) oxide and ammonia

B. hydrogen sulphide and chlorine

C. chlorine and sulphur (IV) oxide

D. ammonia and chlorine

Mineral acids are usually added to commercial hydrogen peroxide to

A. oxidize it

B. decompose it

C. minimize its decomposition

D. reduce it to water and oxygen

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

A. LiCI

B. NaCl

C. CaCl₂

D. MgCl₂

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

A. pig iron

B. wrought iron

C. cast iron

D. iron pyrite

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

A. have variable oxidation states

B. from complex ions

C. act as a catalyst

D. from coloured ions

Which of the following metals is the least reactive?

A. Pb

B. Sn

C. Hg

D. Au

Geometric isomerism can exist in

A. hex-3-ene

B. hexane

C. prop-l-ene

D. 3-methyl but -l-ene

Alkanals can be distinguished from alkanones by the reaction with

A. sudan lll stain

B. starch iodide paper

C. lithium tetrahydrido aluminate (lll)

D. fehling's solution

The isomers of C₃H₈O ARE

A. 1 - propanol and 2 - propanol

B. 1 - propanol and 1 - propanol

C. 2 - propanol and 2 - propanone

D. 2 - propanol and 1 - propanol

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?

A. glucose and starch

B. maltose and starch

C. sucrose and fructose

D. galactose and starch