Atomic and Physical Properties of Group 17 Elements

Iodine vapours are violet in colour because the molecules of iodine:

Among hydrogen halides, which of the following has maximum dipole moment?

Which of the following order is incorrect?

Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules ?

Bond energy of halogens follows the order-

The number of correct trends in halogen gas, among the following will be:

i.  ${\mathrm{F}}_2<{\mathrm{Cl}}_2<{\mathrm{Br}}_2<{\mathrm{I}}_2$ (covalent radius)

ii. ${\mathrm{F}}_2<{\mathrm{Cl}}_2>{\mathrm{Br}}_2>{\mathrm{I}}_2$ (Bond dissociation enthalpy)

iii.  ${\mathrm{F}}_2>{\mathrm{Cl}}_2>{\mathrm{Br}}_2>{\mathrm{I}}_2$ (reduction potential values)

iv.  ${\mathrm{F}}_2<{\mathrm{Cl}}_2<{\mathrm{Br}}_2<{\mathrm{I}}_2$ (density)

Which option among the following is not correct as per indicated property?

Which one of the following is the weakest acid?

Which one of the following is the weakest acid?

An element M has an atomic number 9 and atomic mass 17, its ion will be represented by

The C - C single bond length is $1.54Å$ and that of $Cl-Cl$ is $1.98Å$ . If the electronegativity of $Cl$ and C are 3.0 and 2.5 respectively, the $C-Cl$ bond - length will be equal to

The order of the bond energies of the halogen molecules is

The order of the bond energies of the halogen molecules is

Among hydrogen halides, which of the following has maximum dipole moment?

Halogens are coloured because -

The order of the bond energies of the halogen molecules is

Which one is the correct order of the size of the iodine species ?

Which one is the correct order of the size of the iodine species ?

Which of the following halogen acids is least basic?

Only iodine forms a heptafluoride ${\mathrm{IF}}_7$, but chlorine and bromine give pentafluorides. The reason for this is