D. Answer in brief.
What is an element?
2 Define an atom and a molecule.
Short answer questions
(3. What is the formula of nitric acid? Name the
atoms present in one molecule of nitric acid
4. Compound A reacts with another
compound B to form a compound C. What
kind of change does this represent?
What compounds do these formulae
represent? H,O, CO,, Cuso, NaHCO,
6/ What is crystallisation? What is it used for?
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