13 th group elements (p-block) practice · Medium

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

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 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:

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

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

The similarities among the trichlorides, tribromides and triiodides of all group-13 elements is/are that they are

The formula of potash alum is

Which compound can make fire proof clothes?

For a good quality cement, the ratio of lime to the total of the oxides of $\mathrm{Si}, \mathrm{Al}$ and $\mathrm{Fe}$ should be as close as to

Assertion (A) : ${B}_2 {Cl}_4, {GaCl}_2, {GaS}$ are diamagnetic.

Reason (R) : They show +2 oxidation state.

In which of the following reactions, diborane is not formed?

The industrial scale production of diborane involves the reaction of $\mathrm{BF}_3$ with

Which of the following element is the most abundant metal and the third most abundant element in the earth's crust?

An inorganic compound containing $\left(3 c-2 e^{-}\right)$and $\left(2 c-2 e^{-}\right)$ bonds when reacts with $\mathrm{NH}_3$, at a certain temperature, gives a compound ' $X$ ' which is isostructural with benzene and when reacts at high temperature forms a substance $Y$ '. The substance ' $Y$ ' is

The type of hybridisation in diborane is:

Alum is not used:

Assertion (A): In bivalent state, most of the halides of group 13 elements are hydrolysed in water.

Reason (R): These are covalent in nature.

Which does not exist?

Aluminium reacts with caustic soda to form

Nickeloy is an alloy containing:

The salt used for performing bead test in qualitative inorganic analysis is:

Orthoboric acid

In $\left[{Al}\left({H}_2{O}\right)_6\right]^{3+}$ ion, the hybridisation state of ${Al}$ and the shape of the ion respectively are

Thermite is a mixture of

$\mathrm{BF}_3+\mathrm{LiAlH}_4 \stackrel{\text { Ether }}{\longrightarrow} \mathrm{X}+\mathrm{LiF}+\mathrm{AlF}_3$. Which of the following is incorrect about $\mathrm{X}$?

Which among the following statements are correct?
(i)Carbon monoxide is neutral whereas $S{O_3}$ is acidic.
(ii)Potassium oxide is basic whereas nitrous oxide is acidic.
(iii) Aluminium and zinc oxides are amphoteric.
(iv) Sulphur trioxide is acidic whereas phosphorus pentoxide is basic.
(v) Carbon dioxide is neutal whereas sulphur dioxide is amphoteric