Questions With Solutions Chemistry Elements of p-Block: Groups 13,14,15,16,17 and 18

26.Identify the incorrect statement among the fol­lowing (2007)
(1)Ozone reacts with S02 to give S03
(2)Silicon reacts with aqueous NaOH in the presence of air to give NajS^ and H20
(3)Cl2 reacts with excess of NH3 to give N2 and HC1
(4)Br2 reacts with hot and strong NaOH solu­tion to give NaBr, NaBr04 and H20
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28.Which one of the following is the correct statement ?          (2008)
(1)Boric acid is a protonic acid
(2)Beryllium exhibits coordination number of six.
(3)Chlorides of both beryllium and aluminium have bridged chloride structures in solid phase
(4)B2H6.2NH3 is known as ‘inorganic benzene’.
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29.In which of the following arrangements, the e sequence is not strictly according to the property written against it ?      (2009)
(1)C0₂ < Si0₂ < Sn0₂ < Pb0₂ : increasing oxidising power
(2)HF < HC1 < HBr < HI : increasing acid strength
(3)NH₃ < PH₃ AsH₃ < SbHj : increasing basic strength
(4)B<C<0<N: increasing first ionization enthalpy
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