Question

which is the "king" of chemicals

Answer 1

$Sulphuric$
$Acid$
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It is so important, that at one time the annual production of sulphuric acidwas taken as a measure of the degree of industrialisation of a country, and earned it its nickname of the $'king of chemicals'$. Sulphuric acid is familiar to us as the electrolyte in the lead acidbatteries in automobiles.

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Answer 2

H2so4 (dilute sulphuric acid)