Given below are two statements, one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A:$ The spin only magnetic moment value for $\left[ Fe ( CN )_6\right]^{3-}$ is $1.74 BM$, whereas for $\left[ Fe \left( H _2 O \right)_6\right]^{3+}$ is $5.92\,BM$.
Reason $R :$ In both complexes, $Fe$ is present in +3 oxidation state.
In the light of the above statements, choose the correct answer from the options given below:
Both $A$ and $R$ are true but $R$ is NOT the correct explanation of $A$
$A$ is false but $R$ is true
$A$ is true but $R$ is false
Both $A$ and $R$ are true and $R$ is the correct explanation of $A$
Which of the comparison regarding $Zn,\,Cd,\,Hg$ is/are incorrect ?
$(I)$ $ZnCl_2$ is ionic whereas $CdCl_2$ and $HgCl_2$ are covalent
$(II)$ $Zn$ and $Cd$ dissolves in dilute acid $(HCl)$ liberating $H_2$ but $Hg$ can not
$(III)$ $Zn$ and $Cd$ forming with ppt. of $Zn(OH)_2$ and $Cd(OH)_2$ but $Hg$ forms coloured ppt. of
$(IV)$ all from $A_2^{2+}$ type ion
While filling up of electrons in the atomic orbitals, the $4 s$ orbital is filled before the $3 d$ orbital but reverse happens during the ionisation of the atom. Explain why?
A metal, $M$ forms chlorides in its $+2$ and $+4$ oxidation states. Which of the following statements about these chlorides is correct ?
Which of the following will give green hydrated ion