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I was studying about 13th group elements and I found that in this group Al and Tl react water to form a hydroxide and oxide respectively, but the rest of the elements don't react to form hydroxides.

Can anyone tell me why this is the case?

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Can anyone tell me why this is the case?

Though the elements reside in same group, they react with water and form different products. This is mainly due to inert pair effect.

  1. Boron

$$\ce{2B + 3H2O ->[700-800 C] B2O3 + 3H2}$$

Boron react with water to produce boron trioxide(III) and hydrogen. This reaction takes place at a temperature of 700-800°C.(source)

  1. Aluminium

$$\ce{2Al + 6H2O → 2Al(OH)3 + 3H2}$$

  1. Gallium

$$\ce{2Ga + 6H2O → 2Ga(OH)3 + 3H2 ~~~~~~(1)}$$

$$\ce{2Ga + 4H2O ->[350 C] 2GaO(OH) + 3H2O~~~~~(2)}$$

Gallium react with water to produce gallium oxohydroxide and water. This reaction takes place at a temperature near 350°C. (source)

  1. Thallium

$$\ce{2Tl + H2O ->[atm. O2 ~~~50-70 C] 2TlOH}$$

Thallium react with oxygen and water to produce thallium(I) hydroxide. This reaction takes place at a temperature of 50-70°C. (source)

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  • $\begingroup$ Would you please become more specific? $\endgroup$ – Brett Leigh Dec 13 '16 at 16:25

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