${\mathrm{AlCl}}_3$ is:

Important Questions on The p-Block Elements

MEDIUM

Chemistry>Inorganic Chemistry>The p-Block Elements>Important Compounds of Group 13 Elements

The green colour produced in the borax bead test of a chromium(III) salt is due to -

MEDIUM

Chemistry>Inorganic Chemistry>The p-Block Elements>Important Compounds of Group 13 Elements

Hydrolysis of $BC{l}_3$ gives X which on treatment with sodium carbonate produces $Y, X$ and $Y$ respectively, are

MEDIUM

Chemistry>Inorganic Chemistry>The p-Block Elements>Important Compounds of Group 13 Elements

Diborane $\left({\mathrm{B}}_2{\mathrm{H}}_6\right)$ reacts independently with ${\mathrm{O}}_2$ and ${\mathrm{H}}_2\mathrm{O}$ to produce, respectively:

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Important Compounds of Group 13 Elements

A mixture of Boron trichloride and hydrogen is subjected to silent electric discharge to form $\mathrm{x}$ and $\mathrm{HCl}$. $\mathrm{x}$ is mixed with ${\mathrm{NH}}_3$ and heated to ${200}^0\mathrm{C}$ to form $\mathrm{y}$. The formula of $\mathrm{y}$ is

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Important Compounds of Group 13 Elements

Boric acid is an acid because its molecule

HARD

Chemistry>Inorganic Chemistry>The p-Block Elements>Important Compounds of Group 13 Elements

Choose the correct statements about diborane;
I. It is prepared by the oxidation of sodium borohydride with iodine.
II. It undergoes cleavage reactions with Lewis bases to give borane adducts.
III. It is produced on an industrial scale by the reaction of ${\mathrm{BF}}_3$ with ${\mathrm{LiAlH}}_4$.
IV. It is readily hydrolysed by water to give borazine.
V. It burns in oxygen and gives boron trioxide.

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Important Compounds of Group 13 Elements

The Lewis acid strength of $BB{r}_3, BC{l}_3$ and $B{F}_3$ is in the order

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Important Compounds of Group 13 Elements

Which of the following represents the structure of inorganic benzene?

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Important Compounds of Group 13 Elements

$A{l}_2{\left(S{O}_4\right)}_3$ is used for a variety of purposes but not

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Important Compounds of Group 13 Elements

$A{l}_2{O}_3$ reacts with

MEDIUM

Chemistry>Inorganic Chemistry>The p-Block Elements>Important Compounds of Group 13 Elements

When aqueous solutions of borax is acidified with $\mathrm{HCl}$, we get

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Important Compounds of Group 13 Elements

When a mixture of diborane and ammonia is heated, the final product is

MEDIUM

Chemistry>Inorganic Chemistry>The p-Block Elements>Important Compounds of Group 13 Elements

The order of acidic strength of boron trihalides

HARD

Chemistry>Inorganic Chemistry>The p-Block Elements>Important Compounds of Group 13 Elements

The reaction of ${\mathrm{H}}_3{\mathrm{N}}_3{\mathrm{B}}_3\mathrm{C}{\mathrm{l}}_3\left(\mathrm{A}\right)$ with $\mathrm{L}\mathrm{i}\mathrm{B}{\mathrm{H}}_4$ in tetrahydrofuran gives inorganic benzene $\left(\mathrm{B}\right)$ . Further, the reaction of $\left(\mathrm{A}\right)$ with $\left(\mathrm{C}\right)$ leads to ${\mathrm{H}}_3{\mathrm{N}}_3{\mathrm{B}}_3{\left(\mathrm{M}\mathrm{e}\right)}_3$ . Compounds $\left(\mathrm{B}\right)$ and $\left(\mathrm{C}\right)$ respectively, are:

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Important Compounds of Group 13 Elements

In diborane ____ are present.

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Important Compounds of Group 13 Elements

A Lewis acid $\text{'}\mathrm{X}\text{'}$ reacts with ${\mathrm{LiAlH}}_4$ in ether medium to give a highly toxic gas. This gas when heated with ${\mathrm{NH}}_3$ gives a compound commonly known as inorganic benzene. The gas is

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Important Compounds of Group 13 Elements

${\mathrm{H}}_3{\mathrm{BO}}_3$ is

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Important Compounds of Group 13 Elements

In the structure of borax, the numbers of boron atoms and B - O - B units, respectively, are

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Important Compounds of Group 13 Elements

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

MEDIUM

Chemistry>Inorganic Chemistry>The p-Block Elements>Important Compounds of Group 13 Elements

The number of $2$-centre-$2$-electron and $3$-centre-$2$-electron bonds in ${\mathrm{B}}_2{\mathrm{H}}_6$, respectively, are: