Which of the following is the correct statement?
(1) F2 has higher dissociation energy than Cl2
(2) F has higher electron affinity than Cl
(3) HF is stronger acid than HCl
(4) Boiling point increases down the group in halogens
Among the following, which one is a wrong statement?
(a) PH5 and BiCl5 do not exist
(b) ρp-dp bonds are present in SO2
(c) SeF4 and CH4 have same shape
(d) has bent geometry
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Concept Questions :-
Which of the statements given below is incorrect?
(a) Cl2O7 is an anhydride of perchloric acid
(b) O3 molecule is bent
(c) ONF is isoelectronic with NO2
(d) OF2 is an oxide of fluorine
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
Give reasons :
(i) SO2 is reducing while TeO2 is an oxidizing agent.
(ii) Nitrogen does not form pentahalide.
(iii) ICl is more reactive than I2 (3)
(a) Account for the following : (5 marks)
(i) Acidic character increases from to .
(ii) There is large difference between the melting and boiling points of oxygen and sulphur.
(iii) Nitrogen does not form pentahalide.
(b) Draw the structures of the following :