Question 16 : Although diamond occur in nature but it can be obtained artificially by __________.
By boiling and quick quenching of carbon, silicon and germanium
By boiling and quick quenching of carbon and silicon
Subjecting carbon to high temperature and pressure
Subjecting silicon to high temperature and pressure
Question 17 : _______ is formed when petroleum gases or natural gas is burnt in a limited supply of air.
Question 18 : ________ is used to strenghten rubber, as a pigment in inks, paints, paper and plastics.
Question 16: Subjecting carbon to high temperature and pressure(HPHT - High Pressure High Temperature) Question 17: Carbon black Question 18: Lead (Pb(OH)2•PbCO3 ; PbCrO4 )
The moment you’ve entered the education system is the moment you start to realize that, although studying is extremely important,…
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