First slide

Hydrogen

Question

Correct statement among the following is

Easy

A

Elements of Group 7, 8, 9 form Interstitial hydrides
B

$H_{2}$ can reduce ${Pd}^{2 +}$ but cannot reduce ${Zn}^{+ 2}$
C

Calgon is ${Na}_{2} {Al}_{2} {Si}_{2} O_{8} . {xH}_{2} O$
D

Calgon forms insoluble complexes with cations causing hardness

Solution

(1) ….false …. Elements of group 7,8,9 cannot form Hydrides
(2)…true
$\begin{array}{l} E_{{Pd}^{+ 2} / Pd}^{o} > E_{H^{+} / \frac{1}{2} H_{2}}^{o} > E_{{zn}^{+ 2} / zn}^{o} \\ ∴ H_{2} can reduce {Pd}^{+ 2} but not {Zn}^{+ 2} \end{array}$
(3)….false….. ${Na}_{2} [{Na}_{4} {({PO}_{3})}_{6}] is calogon$
(4) …false… Calgon forms soluble complexes with ${Ca}^{+ 2} & {Mg}^{+ 2}$ which remain in the solution

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