MCQ
Which $d-$ block element is expected to have highest enthalpy of atomisation, among the following ?
- A$Sc$
- B$Mn$
- ✓$V$,$Zn$
- DNone of these
✓
Answer
Correct option: C.
$V$,$Zn$
c
Enthalpy of atomisation is the change in enthalpy when one mole of bonds are completely broken to obtain atoms in the gaseous phase. Transition elements have high effective nuclear charge and a large number of valence electrons. Therefore, they form very strong metallic bonds as a result, the enthalpy of atomisation of transiton metal is high. Due to the absence of unpaired electrons, the inter-atomic electronic bonding is the weakest in $Zn$ and as a result, it has the least enthalpy of atomisation due to presence of $3$ unpared electros. Vanadium have the highest atomisartion enthalpy.
Enthalpy of atomisation is the change in enthalpy when one mole of bonds are completely broken to obtain atoms in the gaseous phase. Transition elements have high effective nuclear charge and a large number of valence electrons. Therefore, they form very strong metallic bonds as a result, the enthalpy of atomisation of transiton metal is high. Due to the absence of unpaired electrons, the inter-atomic electronic bonding is the weakest in $Zn$ and as a result, it has the least enthalpy of atomisation due to presence of $3$ unpared electros. Vanadium have the highest atomisartion enthalpy.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
The order of increasing sizes of atomic radii among the elements $O , S, Se$ and $As$ is
→The following ion shows colour not due to d-d transistion.
The correct $ IUPAC $ name of potassium cuprochloride is
→Aluminium displaces hydrogen from acids but copper does not. A galvanic cell prepared by combining $Cu/C{u^{2 + }}$ and $Al/A{l^{3 + }}$has an e.m.f. of $2.0\,V$ at $298\,K$. If the potential of copper electrode is $+ 0.34 \,V$, that of aluminium is .......... $\mathrm{V}$
→Metal used for making joints in jewellery is
Correct statement about product is
Which of the following is optically active
A reaction $A + B \rightarrow C$ is second order in A and zeroth order in B . How is the rate affected when the concentration of A is doubled and B is halfed?
→Silver sulphide dissolved in a solution of sodium cynamide to form the complex
Which one of the following would lose weight on exposure to atmosphere