Just look at the chlorines and tell me the answer

Chemistry Level 3

Identify the number of species that give positive chromyl chloride test?

N a C l , C u C l X 2 , C u C l , C X 6 H X 5 N H X 3 X + C l X − , H g X 2 C l X 2 , H g C l X 2 , K X 2 [ P t C l X 6 ] , N a X 2 [ N i C l X 4 ] , C a C l X 2 , S n C l X 2 , S n C l X 4 , S b C l X 3 , A g C l , P b C l X 2 , P b C l X 4 , ( N H X 4 ) C l , K C l , M g C l X 2 , H C l , C C l X 4 , A l C l X 3 , H C l O X 4 , H O C l , C l X 2 O X 3 , C l X 2 O X 5 , C l X 2 O X 7 , N C l X 3 , P C l X 3 , P C l X 5 , Z n C l X 2 , [ R h ( P P h X 3 ) X 3 ] C l , A l [ C r C l X 6 ] , [ P t ( H X 2 O ) X 4 C l X 2 ] C l X 2 \ce{NaCl , CuCl2, CuCl, C6H5NH3+Cl^{-}, Hg2Cl2, HgCl2, K2[PtCl6],} \\ \ce{Na2[NiCl4], CaCl2, SnCl2, SnCl4, SbCl3, AgCl, PbCl2,} \\ \ce{PbCl4, (NH4)Cl, KCl, MgCl2, HCl, CCl4, AlCl3,} \\ \ce{HClO4, HOCl, Cl2O3, Cl2O5, Cl2O7, NCl3,} \\ \ce{PCl3, PCl5, ZnCl2, [Rh(PPh3)3]Cl, Al[CrCl6], [Pt(H2O)4Cl2]Cl2}


The answer is 14.

Tapas Mazumdar by Tapas Mazumdar , 20, India

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1 solution

Tapas Mazumdar
Jan 9, 2018

The species are:

N a C l , C u C l X 2 , C u C l , C X 6 H X 5 N H X 3 X + C l X − , H g X 2 C l X 2 , C a C l X 2 , ( N H X 4 ) C l , K C l , M g C l X 2 , H C l , A l C l X 3 , Z n C l X 2 , [ R h ( P P h X 3 ) X 3 ] C l , [ P t ( H X 2 O ) X 4 C l X 2 ] C l X 2 \ce{NaCl, CuCl2, CuCl, C6H5NH3+Cl^{-}, Hg2Cl2, CaCl2, (NH4)Cl, KCl, MgCl2, HCl, AlCl3, ZnCl2, [Rh(PPh3)3]Cl, [Pt(H2O)4Cl2]Cl2}

All of which have at least one chloride ion present in an ionic bond with the cation.

Important things to note :

  • Covalent compounds with chlorine do not respond to this test such as non-metal chlorides
  • Metal complexes with at least one chloride ion in the ionization sphere only respond to this test while those in which chloride ions are part of coordination sphere do not
  • Metals like Sn, Pb, Ag, Au, Sb, etc. do not respond to this test as they form covalent chlorides. Out of the two chlorides of Mercury only mercurous chloride ( H g X 2 C l X 2 \ce{Hg2Cl2} ) responds to this test due to its ionic nature, however, mercuric chloride ( H g C l X 2 \ce{HgCl2} ) is covalent and does not respond to the test.
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