A: Due to small atomic size of fluorine, repulsions between electron pairs already
present in it and the added electron, the tendency of addition of electron
becomes less in F. So the electron gain enthalpy of F2 is less (−333 K.J./ mole)
than that of Cl2 (−349 K.J./ mole).
Q. HF is a liquid while HCl is a gas. Explain.
A: Due to high electronegativity of F, H - F bonds are more polar than H - Cl bonds.
Due to inter molecular hydrogen bonding, HF molecules associate together to
get liquid state, HCl does not form H-bonding, hence it is a gas.
...... H - F ...... H - F ...... H - F ...... H - F ......
Q. Write the balance equations for the following.
a) NaCl is heated with conc. H2SO4 in the presence of MnO2
b) Cl2 is passed into the solution of NaI in water.
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