STD 12 - 4. d and f- block elements — NEET STD 11 Science — Question

$A.$ The electron gain enthalpy of $F$ is more negative than that of $Cl$

$B.$ Ionization enthalpy decreases in a group of periodic table

$C.$ The electronegativity of an atom depends upon the atoms bonded to it.

$D.$ $Al _2 O _3$ and $NO$ are examples of amphoteric oxides.

Choose the most appropriate answer from the options given below:

$(i)$ $Zn|Zn^{2+}\,(1\,M)||Cu^{2+}\,(1\,M)|Cu$

$(ii)$ $Zn|Zn^{2+}\,(0.1\,M)||Cu^{2+}\,(1\,M)|Cu$

$(iii)$ $Zn|Zn^{2+}\,(1\,M)||Cu^{2+}\,(0.1\,M)|Cu$

$(iv)$ $Zn|Zn^{2+}(0.1\,M)||Cu^{2+}\,(0.1\,M)|Cu$

Amongst the above molecule(s)/ion(s), the number of molecule(s)/1on(s) having $sp ^{3} d ^{2}$ hybridisation is $........$

$(I)$ When $X$ dimerises bond angle decreases
$(II)$ When $X$ dimerises bond angle increases
$(III)$ In $X-Y$ molecule $C-C$ bond length is less than that in $Y-Y$ molecule
$(IV)$ Bond angle in $X$ is greater than that in $Y$