Which one of the following does not correctly represent the
correct order of the property indicated against it?
(a) Ti < V < Cr < Mn : increasing number of oxidation states
(b) Ti³⁺ < V³⁺ < Cr³⁺ < Mn³⁺ : increasing magnetic moment
(c) Ti < V < Cr < Mn : increasing melting points
(d) Ti < V < Mn < Cr : increasing 2ⁿᵈ ionization enthalpy
Answers
Answered by
7
Answer:
Which one of the following does not correctly represent the
correct order of the property indicated against it?
(a) Ti < V < Cr < Mn : increasing number of oxidation states
(b) Ti³⁺ < V³⁺ < Cr³⁺ < Mn³⁺ : increasing magnetic moment
(c) Ti < V < Cr < Mn : increasing melting points
(d) Ti < V < Mn < Cr : increasing 2ⁿᵈ ionization enthalpy
Answered by
5
Ti < V < Cr < Mn : increasing melting points is the wrong one.
Explanation:
- The options given in this question are around these four elements titanium, vanadium, chromium and manganese.
- The 1st option talks about the increasing number of oxidation states.
- Talking about oxidation states, titanium has 3, vanadium has 4,chromium has 5 and manganese has 6 oxidation states.
- So the options here are in correct order.
- The second option talks about the magnetic moment.
- Talking about magnetic moment, we need to know the number of unpaired electrons as that is directly proportional to the magnetic moment.
- In Ti³⁺, the number of unpaired electron is 1, for V³⁺ its 2, for Cr³⁺ its 3 and for Mn³⁺ its 4.
- So,they are also in correct order.
- The third option talks about the melting point.
- The melting point of manganese is 1245°C, that of Titanium is 1668°C, that of chromium is 1875°C and of vanadium is 1900°C.
- So the order here is wrong.
- The last option talks about the 2nd ionization enthalpy which is also correct here.
For more information about melting point of d group elements,
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The hydrides of 15th group elements which have the
(a) lowest boiling point ?
(b) maximum basic characters?
(c) Highest bond angle ?
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