Question:
Mixture X= 0.02 mole of $[Co(NH_3)_5SO_4]Br $ and 0.02 mole of $[Co(NH_3)_5Br]SO_4 $ was prepared in 2 L of solution.
1 L of mixture X + excess $AgNO_3 \rightarrow Y $
1 L of mixture X + excess $BaCI_2 \rightarrow Z $
Number of moles of Y and Z are
Mixture X= 0.02 mole of $[Co(NH_3)_5SO_4]Br $ and 0.02 mole of $[Co(NH_3)_5Br]SO_4 $ was prepared in 2 L of solution.
1 L of mixture X + excess $AgNO_3 \rightarrow Y $
1 L of mixture X + excess $BaCI_2 \rightarrow Z $
Number of moles of Y and Z are
Updated On: Apr 2, 2024
- 0.01, 0.01
- 0.02, 0.01
- 0.01, 0.02
- 0.02, 0.02
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The Correct Option is A
Solution and Explanation
In 1 L solution, there will be 0.01 mole of each $[Co(NH_3)_5SO_4] $ Br and $[Co(NH_3)_5Br]SO_4. $ Addition of excess of $AgNO_3 $ will give 0.01 mole of AgBr. Addition of excess of $BaCI_2 $ will give 0.01 mole of $BaSO_4. $
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Concepts Used:
Werner’s Theory of Coordination Compounds
In 1893 Werner produced a theory to explain the structures, formation and nature of bonding in the coordination compounds. This theory is known as Werner’s theory of coordination compounds.
Postulates of Werner's Theory:
The important postulates as observed by Alfred Werner throughout his experiments are as follows:
- The complex/ coordination compounds contain a central metal atom.
- The metal atoms in a coordination compound generally show two types of valency: primary valency and secondary valency.
- The primary valencies denote the oxidation state. They are ionizable and are satisfied by the negative ions.
- Secondary valencies denote the coordination number. They are non-ionizable and are fixed for every metal atom. The secondary valency is generally satisfied by the neutral molecules or negative ions.
- The metal atoms should satisfy both primary and secondary valencies.
- The secondary valency of the atom basically shows the geometry/ polyhedra of the particular coordination compound.
Limitations of Werner’s Theory:
- Though Werner explained some properties of the coordination compound, he failed to explain the colour of the coordinate compound.
- He could not explain the magnetic and optical properties of coordination compounds.
- He could not answer the question, why does the coordination sphere have a definite geometry.