16 solutions available
Question 1State the meaning of the term –(a) atom(b) molecule(c) radical – with a suitable example.
Question 2Draw the basic structure of an atom representing its –(a) Subatomic particles(b) Nucleus(c) Orbits or shells.
Question 6Explain the term – 'atomicity'. Give a reason why –(a) Helium is considered monoatomic, but hydrogen a diatomic molecule.(b) Ozone is...
Question 8'A radical takes part — unsplit in a chemical reaction and retains its identity in reactions'. With reference to the radical:(a)...
Question 9Differentiate between the following with suitable examples — A basic radical and a acid radical.
Question 11Explain the term – 'valency'. State giving reasons the valency of –(a) chlorine in hydrogen chloride(b) sulphate in sulphuric acid(c)...
Question 12Give the symbol and valency of the following elements and radicals.(a) Potassium(b) Sodium(c) Hydrogen(d) Calcium(e) Aluminum(f)...
Question 13Give an example of three elements exhibiting variable valency.
Question 14State what is meant by the term – chemical formula. Give the chemical formula of –(a) sodium hydroxide(b) sodium nitrate(c) sodium...
Question 15'Dilute hydrochloric acid is added to sodium hydroxide'. Give a word equation and a molecular equation of the same. Is the equation...
Question 16State what the group number in the Modern Periodic Table signifies. Give a reason why elements in the same group, have similar valency and...
Question 4Write the symbols and valencies of the following radicals:(a) Magnesium ion(b) Ammonium(c) Carbonate(d) Nitrate(e) Oxide(f) Bisulphate(g)...
Question 6bName one ion for each of the valencies -1, -2 and -3.
Question 9Write the molecular formula of:(a) Sodium sulphide(b) Magnesium oxide(c) Calcium hydroxide(d) Hydrogen chloride(e) Sulphuric acid(f) Iron...
Question 3Match the radicals in List I with their correct names from List II.List IList II1. NO31-A: Bisulphite2. HSO41-B: Phosphate3. SO42-C:...
Question 5Name the followingA molecule of a compound containing two oxygen atoms and one nitrogen atom.The radical containing one nitrogen and four...