First slide

Atomic and physical properties

Question

Regarding ‘Al’ the wrong statement is

Easy

A

It reacts with both acids and bases
B

Its maximum covalency is ‘6’
C

It is a strong reducing agent
D

It becomes passive with con HCl

Solution

→ Al reacts with both acids as well as bases,ie.,Al shows amphoteric nature.
$Al\, + \,6HCl\xrightarrow{{}}\,2AlC{l_3} + 3{H_2}$

$Al\, + \,2NaOH\xrightarrow{{}}\,2NaAl{O_2} + {H_2}$
Sodium meta aluminate
→ Al maximum covalency is 6,due to presence of valency empty 3d-orbitals.
eg.,
${[Al{F_6}]^{ - 3}}$
→ " Al "acts as strong reducing agent.
eg.,
$C{r_2}{O_3} + 2Al\xrightarrow{{}}2Cr + A{l_2}{O_3}$
${B_2}{O_3} + 2Al\xrightarrow{{}}2B + A{l_2}{O_3}$
${Mn_3}{O_4} + 8Al\xrightarrow{{}}9Mn + 4A{l_2}{O_3}$
Al do not passive with conc.HCl
$2Al + 6HCl\,\xrightarrow{{}}\,2AlC{l_3} + 3{H_2} \uparrow$

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