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?

Given below are two statements:

Statement I: During Electrolytic refining, the pure metal is made to act as anode and its impure metallic form is used as cathode.
Statement II: During the Hall-Heroult electrolysis process, purified ${\mathrm{Al}}_2{\mathrm{O}}_3$ is mixed with ${\mathrm{Na}}_3{\mathrm{AlF}}_6$ to lower the melting point of the mixture.
In the light of the above statements, choose the most appropriate answer from the options given below:

Which of the following metallic oxides exhibit amphoteric nature?

The correct decreasing order of stabilities of $+3$ oxidation state of group-$13$ elements is:

Which metal dissolves in $\mathrm{NaOH}$:

Which of the following statement is wrong?

Aluminium oxide exist in nature as gems with different colours. The reason for the difference in colour is due to

Which of the following is wrongly matched?

${\mathrm{AlF}}_3$ 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?

In Borax analyse these given statement and find the value of $\mathrm{x}+\mathrm{y}+\mathrm{z}$

(i) Number of B-O-B bond is $\mathrm{x}$

(ii) Number of B-B bond is $\mathrm{y}$

(iii) Number of ${\mathrm{sp}}^2$ hybridized B atom is $\mathrm{z}$

 

Among the following, how many statements are CORRECT?

(i) $\mathrm{CaCN}{}_2$ on treating with steam gives ${\mathrm{NH}}_3.$

(ii) ${\mathrm{S}}_2{\mathrm{O}}_8^{2-}$ is a better oxidant than ${\mathrm{SO}}_4^{2-}$.

(iii) ${\mathrm{BrF}}_3$ is a better oxidant than fluorine.

(iv) When ${\mathrm{XeF}}_4$ reacts with ${\mathrm{BF}}_3$ the 's' character of hybrid orbitals of 'Xe' decreases.

(v) HF is more volatile than $\mathrm{HCl}$ .

(vi) ${\mathrm{ClO}}_4^{-}$ is a better oxidant than ${\mathrm{ClO}}^{-}.$

(vii) ${\mathrm{F}}_2$ absorbs shorter wavelength than ${\mathrm{I}}_2$ from visible light

(viii) all $\mathrm{\prime }\mathrm{Cl}-\mathrm{O}\mathrm{\prime }$ bond lengths in ${\mathrm{Cl}}_2{\mathrm{O}}_7$ are same.

The maximum covalency of Boron is ____.

Boron exhibits maximum covalency of -------.