Chemical Properties of Group 13 Elements

If the formula of Borax is ${\mathrm{Na}}_2 {\mathrm{B}}_4{\mathrm{O}}_x(\mathrm{OH}{)}_y·{\mathrm{zH}}_2\mathrm{O}$, then $\mathrm{x}+\mathrm{y}+\mathrm{z}= \_\_\_\_\_\_$

Group-$13$ elements react with ${\mathrm{O}}_2$ in amorphous form to form oxides of type ${\mathrm{M}}_2{\mathrm{O}}_3$ ($\mathrm{M}=$ element). Which among the following is the most basic oxide?

Which of the following is most basic?

Which of the following metallic oxides exhibit amphoteric nature?

${\mathrm{AlF}}_3$ is soluble in $\mathrm{HF}$ only in the presence of $\mathrm{KF}$. It is due to the formation of 

Which of the following statements is incorrect?

Concentrated ${\mathrm{HNO}}_3$ is stored in containers made up of

For ${\mathrm{BCl}}_3, {\mathrm{AlCl}}_3$and ${\mathrm{GaCl}}_3$ the increasing order of ionic character is

Predict the correct shape of ${\mathrm{BH}}_4^{-}$.

Which of the following statements is incorrect?

Which of the following oxides is amphoteric in nature?

In which of the following reactions, the geometry around the boron atom in the product is non-planar?

Which of the following oxides is acidic in nature?

The hardest substance among the following is

${\mathrm{H}}_3{\mathrm{BO}}_3$ and ${\mathrm{HBO}}_2$ resemble in:

The correct statements from the following are :

(A) The decreasing order of atomic radii of group $13$ elements is $\mathrm{Tl}>\mathrm{In}>\mathrm{Ga}>\mathrm{Al}>\mathrm{B}.$
(B) Down the group $13$ electronegativity decreases from top to bottom.
(C) $\mathrm{Al}$ dissolves in dil. $\mathrm{HCl}$ and liberate ${\mathrm{H}}_2$ but conc. ${\mathrm{HNO}}_3$ renders $\mathrm{Al}$ passive by forming a protective oxide layer on the surface.
(D) All elements of group $13$ exhibits highly stable $+1$ oxidation state.
(E) Hybridisation of $\mathrm{Al}$ in ${\left[\mathrm{Al}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{3+}$ ion is ${\mathrm{sp}}^3 {\mathrm{d}}^2.$

Choose the correct answer from the options given below :

The number of neutrons present in the more abundant isotope of boron is 'x'. Amorphous boron upon heating with air forms a product, in which the oxidation state of boron is 'y'. The value of x + y is …

Statement 1: For 13th group element stability of oxidation state is: ${\mathrm{Ga}}^{+}<{\mathrm{In}}^{+}<{\mathrm{Tl}}^{+}$

Statement 2: On moving down the group stability of lower oxidation state increases due to poor shielding of $\mathrm{d}$ and $\mathrm{f}$ electron.

If the number of neutrons in the most abundant isotope of boron $\mathrm{X}$ and its highest oxidation state in unsaturated compound is $\mathrm{Y}$ then find the value of $\mathrm{X}+\mathrm{Y}$.

Given below are two statements :

Statement I: Group $13$ trivalent halides get easily hydrolysed by water due to their covalent nature.

Statement II: ${\mathrm{AlCl}}_3$ upon hydrolysis in acidified aqueous solution forms octahedral ${\left[\mathrm{Al}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{3+}$ ion.

In the light of the above statements, choose the correct answer from the options given below :