Brass is an alloy of
$Zn $ and $ Sn$
$Zn$ and $ Cu$
$Cu, Zn $ and $Sn$
$Cu$ and $Sn$
In the series $\operatorname{Sc}(Z=21)$ to $\operatorname{Zn}(Z=30)$, the enthalpy of atomisation of zinc is the lowest, i.e.. $126\, kJ\, mol ^{-1}$. Why?
Which of the following has maximum first ionisation energy ?
Assertion : Magnetic moment values of actinides are lesser than the theoretically predicted values.
Reason : Actinide elements are strongly paramagnetic.
$\operatorname{Zr}\,(\mathrm{Z}=40)$ and $\mathrm{Hf}\,(\mathrm{Z}=72)$ have similar atomic and ionic radii because of :
The spin only magnetic moment of the complex present in Fehling's reagent is $B.M.$(Nearest integer).