The variation of the boiling point of the hydrogen halides is in the order HF > HI > HBr > HCl. What explains the higher boiling point of hydrogen fluoride?
(a) The electronegativity of fluorine is much higher than for other elements in the group
(b) There is strong hydrogen bonding between HF molecules
(c) The bond energy ol HF molecules is greater than in other hydrogen halides
(d) The effect of nuclear shielding is much reduced in fluorine which polarises the HF molecule
When Cl2 gas reacts with hot and concentrated sodium hydroxide solution, the oxidation number of chlorine changes from
(a) zero to +1 and zero to -5
(b) zero to -1 and zero to +5
(c) zero to -1 and zero to +3
(d) zero to +1 and zero to -3
Among the following which is the strongest oxidising agent ?
(i) What happens when (5 marks)
(a) chlorine gas reacts with cold and dilute
solution of NaOH ?
(b) XeF2 undergoes hydrolysis ?
(ii) Assign suitable reasons for the following :
(a) SF6 is inert towards hydrolysis.
(b) H3PO3 is diprotic.
(c) Out of noble gases only Xenon is known to form
established chemical compounds.
(i) Considering the parameters such as bond dissociation (5 marks)
enthalpy, electron gain enthalpy and hydration enthalpy,
compare the oxidizing power of F2 and Cl2.
(ii) Complete the following reactions :
(a) Cu + HNO3(dilute)
(b) Fe3+ + SO2 + H2O
(c) XeF4 + O2F2