Q. A chemical reaction that place with the evolution of heat is called a/an
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Q. What is the heaviest noble gas?
Q. DDT is the name of a chemical that can be used as as (an)
Q. What happens when a chemical bond is formed
Q. The element used in the manufacture of safety matches is
Q. CN- ion is isoelectronic with
Q. A yellow element that stinks when burned
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