In which of the following reaction, the hybridisation of the central atom changes from $sp^2$ to $sp^3$ ?
$N{H_3} + {H^ + } \to NH_4^ + $
$Al{F_3} + 3{F^ - } \to AlF_6^{3 - }$
$B{F_3} + {F^ - } \to BF_4^ - $
${H_2}O + {H^ + } \to {H_3}{O^ + }$
Aluminium is a self-preserving metal, because
In electrolysis of aluminium oxide which of the following is added to accelerate the process
Mention isotops of boron.
Which of the following statements about the interstitial compounds is incorrect?
Which of the following mineral does not contain aluminium?