1) Elements having valency of two are called ________. a) Covalent b) Divalent c) Monovalent 2) Name a gaseous non-metal. a) Nitrogen b) Ammonia c) Oxygen 3) Chemical Formula of Sodium Zincate a) N2O b) Na2ZnO2 c) FeSO4 4) Element : Oxygen :: Compound : ______ a) Potassium b) Copper c) Sodium Chloride 5) _______is short form or abbreviated name of the element.  a) Atom b) Symbol c) Compound 6) Copper : Cuprum :: Lead : ____ a) Natrium b) Plumbum c) Helium 7) A _____ equation tells us in what ratio the substances react or are produced. a) unbalenced b) balanced 8) The formula of silver [I] chloride is ________. a) AgCl2 b) AgCl3 c) AgCl 9) Chemical formula of Nitric acid a) HNO3 b) HCL 10) _______ is a group of atoms of elements that behave like a single unit and show valency. a) Radical b) ION

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