Q.1 "Iodine stain on piece of cloth is removed by pouring a colourless solution." Identify the colourless solution. Explain and provide chemical reaction.
Q.2 Give four reason in favour of the peculiar behaviour of fluorine.
Q.3 Draw the structure of the following molecules, provide shape and electron count.
ClF3, SF4
Q.4 Explain the following observation:
"A blue litmus is dipped in chlorine water. first it changes to red then become colourless."
Q.5 Cite an example of reducing property of Iodine.
Q.6 "HBr cannot be prepared by using conc. H2SO4 and KBr." -Justify this statement. Is there any other method of preparation? Write it with balanced chemical equation.
Q.7 "Electron Affinity of Fluorine is lesser than that of Chlorine."- Justify the statement. Comment on general trends of Electron Affinity down the group.
Q.8 Taking a common reactant show that Fluorine behaves quite differently from other congeners.
Q.9 Cite an example of Disproportionation reaction. Why does not Fluorine undergo this reaction?
Q.10 Define ‘Interhalogen' compounds. State any two characteristics of them. Cite few examples.
Q.11 What do you mean by the term ‘ Pseudohalogen'? Why are they called so? Give examples.
Q.12 What happens when (i) NaF is treated with conc. H2SO4 in a glass tube. (ii) Chlorine water is added in Potassium Iodide solution in presence of Carbon tetrachloride, followed by vigorous shaking.