P-Block elements questions for CBSE chemistry

P-Block elements questions for CBSE chemistry

P-BLOCK 

1.      Amongst H₂O, H₂S, H₂Se and H₂Te, the one with highest boiling point is :

         (a)  H₂O because of hydrogen bonding.

         (b)  H₂Te because of higher molecular weight.

         (c)  H₂S because of hydrogen bonding.

         (d) H₂Se because of lower molecular weight.

2.      The number of S—S bonds in sulphur trioxide trimer S₃O₉ is :

         (a)  three                                                          (b)  two

         (c)  one                                                            (d) zero

3.      Oleum is :

         (a)  a mixture of conc. H₂SO₄ and oil             (b)  sulphuric acid saturated with SO₃

         (c)  a mixture of H₂SO₄ and HNO₃                 (d) a mixture of H₂SO₄ and HCl

4.      Select the correct order of acidity :

         (a)  HI  >  HBr  >  HCl   >  HF

         (b)  HClO₄  >  HBrO₄  >  HIO₄

         (c)  HClO₃  >  HBrO₃ >  HIO₃

         (d) All are correct

5.      Which of the following has highest bond strength ?

         (a)  HI                                                              (b)  HCl

         (c)  HF                                                             (d) HBr

ANSWERS

1.            (a)     

2.         (d)         S₃O₉ is                       

3.            (b)      Oleum is H₂SO₄ + SO₃ º H₂S₂O₇

4.            (d)     

5.            (c)       Size of fluorine is very small so that the bond strength is highest.