13 th group elements (p-block) practice · Mixed difficulty

Which of the following does not have a tetrahedral structure?

When Al is added to KOH solution

${Na}_2 {B}_4 {O}_7 \cdot 10 {H}_2 {O}$ is correctly represented by

Orthoboric acid when heated to red hot, gives :

Which one of the following has the highest Lewis acid strength?

Which of the following pair have almost the same atomic radii

Select a correct statement about boric acid

The formula of kernite (or) resorite is

Which of the following shows variable valency?

Diborane is prepared on large scale by

One that marks the paper like lead is:

Assertion (A) : $\mathrm{B}(\mathrm{OH})_3$ is a good lubricant and slippery.

Reason (R) : $\mathrm{B}(\mathrm{OH})_3$ has a layer structure.

The correct statements among the following is;

(I) Boric acid is a weak monobasic lewis acid.

(II) Boron trioxide is acidic and reacts with basic (metallic) oxides forming metal borates.

(III) Oxides of indium and thallium are amphoteric.

When orthoboric acid $\left( {{\mathrm{H}_3}\mathrm{B}{\mathrm{O}_3}} \right)$ is heated the residue left is:

The relative stability of +1 oxidation state of group 13 elements follows the order

$\begin{gathered} {\text{Borax}}\xrightarrow[{{\text{ Excess }}}]{\Delta }{\text{NaB}}{{\text{O}}_2} + {\text{(B)}} \quad \\ {\text{(B)}} + {\text{Nickel oxide}}\xrightarrow{\Delta }{\text{(C)}} \quad \\ \end{gathered}$

Compound $\mathrm{C}$ and its colour is

Consider the following statements:-
a) Borax dissolves in water to give an alkaline solution
b) Boric acid is weak monobasic protonic acid
c) ${\mathrm{H}_\mathrm{3}}\mathrm{B}{\mathrm{O}_\mathrm{3}}$ has layered structure in which $\mathrm{B}{\mathrm{O}_\mathrm{3}}$ units are joined by hydrogen bonds
The incorrect statement(s) is/are:

The group 13 element that is liquid during summer and used for measuring high temperature is

Which is used as disinfectant?

Which is used as mordant?

Value of $x$ in potash alum,
${\mathrm{K}_2}\mathrm{S}{\mathrm{O}_4}\mathrm{.A}{\mathrm{I}_x}{\left( {\mathrm{S}{\mathrm{O}_4}} \right)_3}.24{\mathrm{H}_2}\mathrm{O}$

The exhibition of highest coordination number depends on the availability of vacant orbitals in the central atom. Which of the following elements is not likely to act as central atom in $\mathrm{MF}_6^{3-}$ ?

$\begin{aligned} & {Na}_2 {B}_4 {O}_7 \cdot 10 {H}_2 {O} \stackrel{\Delta}{\longrightarrow} {X}+{NaBO}_2+{H}_2 {O} \\ & {X}+{Cr}_2 {O}_3 \stackrel{\Delta}{\longrightarrow} {Y}(\text { Green coloured }) \\ & {X} \text { and } {Y} \text { are } \end{aligned}$

${B}_2 {H}_6$ can't be prepared by:

Which of the following has the minimum heat of dissociation:

Coordination number of aluminium is

B—F bond order in $\mathrm{B}{\mathrm{F}_3}$ is:

The two type of bonds present in ${\mathrm{B}_2}{\mathrm{H}_6}$ are covalent and……

Consider the given statements regarding the properties of boron.

I. It is a hard refractory solid.

II. It has low melting point and high density.

III. It shows high electrical conductivity.
Choose the correct statement(s).

Observe the following statements
1) ${\mathrm{H}_\mathrm{3}}\mathrm{B}{\mathrm{O}_3}$ is used as antiseptic
2) In ${\mathrm{B}_\mathrm{2}}{\mathrm{H}_\mathrm{6}}$ each Boron atom is $\mathrm{S}{\mathrm{P}^\mathrm{2}}$ hybridisation
3) An aqueous solution of borax is alkaline in nature
The correct statements are