Question 9 : Deficiency of one of these leads to goitre in humans
Question 10 : One of these statements is not true of oxides of halogen.
All oxides of halogens have positive free energies of formation
Chlorine oxides are used as bleaching agents
Except for that of iodine all oxides tend to be explosive
The higher oxides tend to be more stable than the lower
Question 11 : PVC pipes are manufactured using
Question 12 : Which of these statements is not true of halogens ?
They are only one electron short of the noble gas configuration
Fluorine is the strongest oxidising agent in the whole group
They form the cation X+
The bond in interhalogen compounds is polar
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