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

The correct order of atomic radii in group 13 element is

(A): ${BF}_3$ is a weaker acid than ${BCl}_3$

(R): Deocalised back bond formation is observed in ${BF}_3$

(A): Among IIIA group gallium has low melting point.

(R): Gallium has $4 s^2 4 p^1$ configuration in the valence shell.

Which does not exist?

For compound having the formula $GaAICI_4$, the correct option from the following is

Ionisation enthalpy for the elements of Group-13 follows the order

Aluminium oxide is not reduced by chemical reactions since

Which is/are fire extinguishers?

$BC{l_3}$ does not exists as dimer but $B{H_3}$ exists as dimer because

Which of the following is a gas?

What is the oxidation state and hybridisation of boron in compound formed when $\mathrm{BCl}_3$ undergoes reaction with the water?

The protective film of oxide on the surface of Al metal may be strengthened by:

$p \mathrm{Al}(s)+q \mathrm{HCl}(a q) \longrightarrow r \mathrm{Al}^{3+}(a q)+s \mathrm{Cl}^{-}(a q) +t \mathrm{H}_2(g)$

The stoichiometric coefficients ( $p, q, r, s, t$ ) used in balancing the above reaction are respectively

Boric acid on heating at $150^\circ C$ gives:

Which metal is powdered, suspended in oil and used as paint?

Which of the following is a use of alum?

Which of the following form dimeric halides?

Purification of alumina is essential because:

Aluminium reacts with caustic soda to form

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:

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

Diborane does not undergo cleavage reaction with:

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

Thermite is a mixture of

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