Question

The antonym of comproportionation is:
A. Proportionation
B. Disproportionation
C. Oxidation
D. Reduction

Answer 1

Comproportionation also known as synproportionation is a chemical reaction where two reactants each containing the same element but with a different oxidation number, form a product in which the elements involved reach the same oxidation number.

Complete Answer:
Comproportionation or disproportionation is a chemical reaction where two reactants each contain the same element but with a different oxidation number and form a product in which the elements involved reach the same oxidation number. It is the opposite of disproportionation.
For example given below is the reaction involving comproportionation:
$Pb + Pb{O_2} + 2{H_2}S{O_4}\xrightarrow[{}]{}2PbS{O_4} + 2{H_2}O$

Here the compound used is $Pb$ or lead and the product formed is Lead sulphate. Lead is a chemical element with atomic number 82. It is a heavy metal that is denser than most common materials. It is soft and malleable and also has a relatively low melting point. When it is freshly cut it is silvery with a hint of blue. It changes to a dull grey colour when exposed to air. It has the highest atomic number of any stable element. It is easily extracted from its ores and is relatively unreactive. Galena is a principal ore of lead which often bears silver. It also has an amphoteric nature.

Lead sulphate is a white solid which appears white in microcrystalline form. It is also known as fast white, sulphuric acid lead salt or anglesite. It is often seen in electrodes of car batteries as it is formed when the battery is discharged. It is also poorly soluble in water.

Therefore, the answer is option C.

Note: Lead reacts with lead oxide where both have different oxidation numbers and form two molecules of Lead sulphate where the lead elements have the same oxidation number.