Chapter: The p-block Element (Group 13 and Group 14)

The reaction of \(\begin{align}{{H}_{3}}{{N}_{3}}{{B}_{3}}C{{l}_{3}}\end{align}\) (A) with \(\begin{align}LiB{{H}_{4}}\end{align}\) in tetrahydrofuran gives inorganic benzene (B). Further, the reaction of (A) with (C) leads to \(\begin{align}{{H}_{3}}{{N}_{3}}{{B}_{3}}{{\left( {Me} \right)}_{3}}\end{align}\). Compounds (B) and (C) respectively, are:

\(\begin{align}{{C}_{{60}}}\end{align}\), an allotrope of carbon cantains:

The correct statements among I to III regarding group 13 element oxides are,
(I) Boron trioxide is acidic.
(II) Oxides of aluminium and gallium are amphoteric.
(III) Oxides of indium and thallium are basic.

Diborane (\(\begin{align}{{B}_{2}}{{H}_{6}}\end{align}\)) reacts independently with \(\begin{align}{{O}_{2}}\end{align}\) and \(\begin{align}{{H}_{2}}O\end{align}\) to produce, respectively;

The hydride that is NOT electron deficient is:

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

The electronegativity of aluminium is similar to:

The number of 2-centre-2-electron and 3-centre-2-electron bonds in \(\begin{align}{{B}_{2}}{{H}_{6}}\end{align}\), respectively, are:

Aluminium is usually found in +3 oxidation state. In contrast, thallium exists in +1 and + 3 oxidation states. This is due to:

When metal ‘M’ is treated with NaOH, a white gelatinous precipitate ‘X’ is obtained, which is soluble in excess of NaOH. Compound ‘X’ when heated strongly gives an oxide which is used in chromatography as an adsorbent. The metal ‘M’ is:

A group 13 element ‘X’ reacts with chlorine gas to produce a compound \(\begin{align}XC{{l}_{3}}\end{align}\). \(\begin{align}XC{{l}_{3}}\end{align}\) is electron deficient and easily reacts with NH3 to form \(\begin{align}C{{l}_{3}}X\text{ }\leftarrow \text{ }N{{H}_{3}}\end{align}\) adduct, however, \(\begin{align}XC{{l}_{3}}\end{align}\) does not dimerize.X is:

Identify the reaction which does not liberate hydrogen:

In the following sets of reactants which two sets best exhibit the amphoteric characters of \(\begin{align}A{{l}_{2}}{{O}_{3}}\text{ }.x{{H}_{2}}O\end{align}\)?
Set 1: \(\begin{align}A{{l}_{2}}{{O}_{3}}\text{ }.x{{H}_{2}}O\left( s \right)\text{ }and\text{ }O{{H}^{-}}\left( {aq} \right)\end{align}\)
Set 2: \(\begin{align}A{{l}_{2}}{{O}_{3}}\text{ }.x{{H}_{2}}O\left( s \right)\text{ }and\text{ }{{H}_{2}}O\left( l \right)\end{align}\))
Set 3: \(\begin{align}A{{l}_{2}}{{O}_{3}}\text{ }.x{{H}_{2}}O\left( s \right)\text{ }and\text{ }{{H}^{+}}\left( {aq} \right)\end{align}\))
Set 4: \(\begin{align}A{{l}_{2}}{{O}_{3}}\text{ }.x{{H}_{2}}O\left( s \right)\text{ }and\text{ }N{{H}_{3}}\left( {aq} \right)\end{align}\)

Which one of the following is the correct statement?

Heating an aqueous solution of aluminium chloride to dryness will give

The structure of diborane (\(\begin{align}{{B}_{2}}{{H}_{6}}\end{align}\)) contains

Beryllium and aluminium exhibit many properties which are similar. But, the two elements differ in

Aluminium chloride exists as dimer, \(\begin{align}A{{l}_{2}}C{{l}_{6}}\end{align}\) in solid state as well as in solution of non-polar solvents such as benzene. When dissolved in water, it gives

Alum helps in purifying water by

The basic structural unit of feldspar, zeolites, mica, and asbestos is:

The correct statement among the following is:

The C – C bond length is maximum in:

The correct order of catenation is:

The amorphous form of silica is:

The element that does NOT show catenation is:

The element that shows greater ability to form \(\begin{align}p\pi -p\pi \end{align}\) multiple bonds, is:

The chloride that CANNOT get hydrolysed is:

Correct statements among ‘A’ to ‘D’ regarding silicones are:
(A) They are polymers with hydrophobic character.
(B) They are biocompatible.
(C) In general, they have high thermal stability and low dielectric strength.
(D) Usually, they are resistant to oxidation and used as greases.

Which of the following are Lewis acids?

In graphite and diamond, the percentage of p-characters of the hybrid orbitals in hybridisation are respectively:

Match the items in Column I with its main use listed in Column II:
   Column I                        Column II
(A) Silica gel                  (i) Transistor
(B) Silicon                      (ii) Ion–exchanger
(C) Silicone                    (iii) Drying agent
(D) Silicate                     (iv) Sealant

Assertion: Among the carbon allotropes, diamond is an insulator, whereas, graphite is a good conductor of electricity.
Reason: Hybridization of carbon in diamond and graphite are \(\begin{align}s{{p}^{3}}\end{align}\) and \(\begin{align}s{{p}^{2}}\end{align}\), respectively.

The gas evolved on heating \(\begin{align}Ca{{F}_{2}}\end{align}\) and \(\begin{align}Si{{O}_{2}}\end{align}\) with concentrated \(\begin{align}{{H}_{2}}S{{O}_{4}}\end{align}\), on hydrolysis gives a white gelatinous precipitate. The precipitate is:

Example of a three-dimensional silicate is:

Identify the incorrect statement:

The catenation tendency of C, Si and Ge is in the order Ge < Si < C. The bond energies (in kJ\(\begin{align}mo{{l}^{{-1}}}\end{align}\)) of C – C, Si – Si and Ge –Ge bonds are respectively;

In view of the signs of \(\begin{align}{{\Delta }_{r}}{{G}^{o}}\end{align}\) for the following reactions:
\(\begin{align}Pb{{O}_{2}}+Pb\to 2PbO,{{\Delta }_{r}}{{G}^{o}}<0\end{align}\)
\(\begin{align}Sn{{O}_{2}}+Sn\to 2SnO,{{\Delta }_{r}}{{G}^{o}}>0\end{align}\)
which oxidation states are more characteristics for lead and tin?

Among the following substituted silanes, which one will give rise to cross linked silicone polymer on hydrolysis is

The stability of dihalides of Si, Ge, Sn and Pb increases steadily in the sequence

A metal, M forms chlorides in its +2 and +4 oxidation states. Which of the following statements about these chlorides is correct?

In silicon dioxide

The soldiers of Napolean army while at Alps during freezing winter suffered a serious problem as regards to the tin buttons of their uniforms. White metallic tin buttons got converted to grey powder. This transformation is related to

Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that graphite

Glass is a

For making good quality mirrors, plates of float glass are used. These are obtained by floating molten glass over a liquid metal which does not solidify before glass. The metal used can be