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

The order of Lewis acid nature

Purification of alumina is essential because:

The correct order of atomic radii in group $\mathrm{13}$ elements is

Assertion: Boron is a nonmetal, whereas the other group of 13 elements are metals.

Reason: Boron has a smaller atomic radius than the other group of 13 elements.

Aluminium reacts with caustic soda to form

$B{F_3}$ on hydrolysis forms

Which one of the following elements of unable to form $\mathrm{MF}_\mathrm{6}^{\mathrm{3 - }}$ ion ?

A mixture of boric acid with ethyl alcohol burns with green edged flame due to the formation of

A metal " $\mathrm{M}$ " forms $\mathrm{M}_{2} \mathrm{O}_{3}$ type oxide and $M N$ type nitride. The atomic number of the metal could be

Borazine, also known as inorganic benzene, can be prepared by the reaction of 3-equivalents of " $X$ " with 6-equivalents of "$Y$". " $X$ " and "$Y$", respectively are:

Muddy water can be purified through coagulation by using

Consider the following statement about the following reactions :

$A$ : $2 {H}_2 {O}({l})+2 {~F}_2({~g}) \rightarrow 4 {HF}({g})+{O}_2({~g})$

$B$ : ${BF}_3+{HF} \rightarrow {HBF}_4$

I. Reaction ($A$) is redox reaction whereas reaction $(B)$ is acid-base reaction

II. In reaction ($A$) ${H}_2 {O}$ is oxidising agent.

III. In reaction $({B}), {BF}_3$ is Lewis base.

Choose the correct statement(s) :

Be and Al exhibits many properties which are similar but the two elements differ is:

Thermite a mixture used for welding is:

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

Which of the following has the minimum heat of dissociation:

The glass having smallest coefficient of thermal expansion is :

The formula of mineral borax is

Borax bead test is used to identify the Meta borates of transition metals. It is based on

Diborane does not undergo cleavage reaction with:

Boric acid polymerises due to

Which one of the following elements is unable to form $MF_6^{3 - }$ ion

The number of $OH$ units directly linked to boron atoms in $N{a_2}{B_4}{O_3}.\,10\,{H_2}O$ is

Eka aluminium is:

The correct Lewis acid order for boron halides is:

Thermite is a mixture of

Assertion: Boron exhibits a wide range of oxidation states, including negative and fractional oxidation states.

Reason: The small size of the boron atom and its high electronegativity make it easy to form a variety of covalent bonds and oxidation states.

The element which exists in liquid state for a wide range of temperature and can be used for measuring high temperature is

An aqueous solution of potash alum gives

Given below are two statements:

Statement I : Upon heating a borax bead dipped in cupric sulphate in a luminous flame, the colour of the bead becomes green.
Statement II: The green colour observed is due to the formation of copper(I) metaborate.
In the light of the above statements, choose the most appropriate answer from the options given below.