State whether the following statements are true (T) or false (F):

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 Multiple Choice QuestionsTrue Or False

641. State whether the following statements are true (T) or false (F):

A.

Nitrogen does not extend its covalency beyond four.

B.

The group 16 elements have general electronic configuration ns2 np3.

C.

H2SO4 is a dehydrating and oxidising agent.

D.

Pure phosphine is inflammable.

E.

Nitrous oxide does not support the burning splint.
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642. State whether the following statements are true (T) or false (F):

A.

Chlorine gas undergoes disproportionation when passed into water.

B.

The reaction betwen hydrogen and fluorine is very low at room temperature.

C.

HBr is a stronger acid than HI because of hydrogen bonding.

D.

Iodine is a better nucleophile than bromide.

E.

Among halogens, iodine is the most reactive.


A. TRUE
B. FALSE
C. FALSE
D. TRUE
E. TRUE
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 Multiple Choice QuestionsMultiple Choice Questions

643.

PCi5 exists but NCi5 does not because

  • N2 is inert
  • NCl5 is unstable
  • small size of N
  • of non-availability of vacant d-atomic orbitals.
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644.

The shape of IF7 molecule is

  • tetrahedral
  • trigonal bipyramidal
  • octahedral
  • pentagon bipyramidal
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645.

The most stable allotropic of sulphur is

 

  • rhombic sulphur

  • flowers of sulphur
  • plastic sulphur
  • monp-clinic sulphur
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646.  XeF6 on complete hydrolysis gives
  • XeOF2 
  • XeO2
  • XeO2F2 
  • XeO3
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647. The strongest oxidising agent is
  • HOCl
  • HClO4
  • HClO3

  • HClO2

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648.

Fluorine does not show positive oxidation state due to absence of

  • d-orbitals
  • s-orbitals
  • p-orbitals
  • None of the above
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649. Iodine can exist in the oxidation states
  •  + 1, + 3, + 5
  • –1, + 1, + 3
  • + 3, + 5, + 7
  • –1, + 1, + 3, + 5, + 7
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650. Structure of NH3 is
  • Trigonal
  • Tetrahedral
  • Pyramidal
  • Trigonal bipyramidal
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