Name the following element: A trivalent metal used to make light tools.

Trivalent metals are placed in group thirteen. These metals have three electrons that can be given off to attain stability. Aluminium is the trivalent metals that has low density and is used to make light tools. Duralumin an alloy of aluminium and copper is lightweight and strong enough to make the body of the aircraft.

Name the following element: An alkaline earth metal present in group 2 and period 3 .

An alkaline earth metal that is present in group two has valency 2 , and as it is present in period third it has three shells in its atom. Its electronic configuration is 2 , 8 , 2 , hence its atomic number is 12 . The metal is magnesium.

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When Diborane $(B_{2} H_{6})$ reacts with $O_{2}$ and $H_{2} O$ independently, then products formed are:

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Important Questions on The p-Block Elements

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Group 13 Elements: The Boron Family

Iodine reacts with concentrated

H N O_{3}

to yield

Y

along with other products. The oxidation state of iodine in

Y

, is:

MEDIUM

Chemistry>Inorganic Chemistry>The p-Block Elements>Group 13 Elements: The Boron Family

Give a reason for the following:

Inert gases do not form ions.

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Group 13 Elements: The Boron Family

The product obtained as a result of a reaction of nitrogen with

C a C_{2}

is:

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Chemistry>Inorganic Chemistry>The p-Block Elements>Group 13 Elements: The Boron Family

α -

chlorosodium acetate on boiling with aqueous sodium nitrite gives

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Chemistry>Inorganic Chemistry>The p-Block Elements>Group 13 Elements: The Boron Family

The indicator used during the estimation of

COD

of a water sample is

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Group 13 Elements: The Boron Family

{AlF}_{3}

is soluble in

HF

only in presence of

KF

. It is due to the formation of

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Chemistry>Inorganic Chemistry>The p-Block Elements>Group 13 Elements: The Boron Family

H_{3} {PO}_{2}

and

H_{3} {PO}_{3}

, the numbers of

P - H

bonds are, respectively,

MEDIUM

Chemistry>Inorganic Chemistry>The p-Block Elements>Group 13 Elements: The Boron Family

What is the atomicity of aluminium phosphate?

HARD

Chemistry>Inorganic Chemistry>The p-Block Elements>Group 13 Elements: The Boron Family

The following table represents the elements and the atomic number. With reference to this, answer the following using only the alphabets given in the table.

Element	Atomic number
$P$	$13$
$Q$	$7$
$R$	$10$

Which element has an electron affinity zero?

HARD

Chemistry>Inorganic Chemistry>The p-Block Elements>Group 13 Elements: The Boron Family

Name the following element:

A trivalent metal used to make light tools.

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Group 13 Elements: The Boron Family

Identify the incorrect statements from the following

I .

Tin in

+ 2

state acts as reducing agent while lead in

+ 4

state acts as strong oxidising agent.

II .

Silicon exists as both

{[{SiF}_{6}]}^{2 -}

and

{[{SiCl}_{6}]}^{2 -}

forms.

III .

The hybridisation of carbon in fullerene is

{sp}^{3}

IV .

Among

Ge, Sn

and

Pb

lowest melting point is for

Sn

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Chemistry>Inorganic Chemistry>The p-Block Elements>Group 13 Elements: The Boron Family

Consider the following radioactive decays

I. ${}_{92}U {\overset{- α}{⟶}}_{90} Th$ and

II. $_{90} Th \overset{- α}{⟶} {}_{88}{Ra}$

In which case group of parent and daughter elements remains unchanged.

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Group 13 Elements: The Boron Family

Identify the correct statements

I)

Germanium exists only in traces.

II)

The order of electronegativity of

Si, Ge, Sn

Sn > Ge > Si

III)

All group

14

elements are available in solid state

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Group 13 Elements: The Boron Family

Good reducing nature of

H_{3} P O_{2}

is attributed to the presence of:

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Group 13 Elements: The Boron Family

The increasing order of atomic radii of the following group

13

elements is

HARD

Chemistry>Inorganic Chemistry>The p-Block Elements>Group 13 Elements: The Boron Family

For compound having the formula

{GaAlCl}_{4}

, the correct option from the following is

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Chemistry>Inorganic Chemistry>The p-Block Elements>Group 13 Elements: The Boron Family

Given below are two statements:

Statement I: The decrease in first ionization enthalpy from $B$ to $Al$ is much larger than that from $Al$ to $Ga$ .

Statement II: The d orbitals in $Ga$ are completely filled.

In the light of the above statements, choose the most appropriate answer from the options given below

HARD

Chemistry>Inorganic Chemistry>The p-Block Elements>Group 13 Elements: The Boron Family

Name the following element:

An alkaline earth metal present in group $2$ and period $3$ .

MEDIUM

Chemistry>Inorganic Chemistry>The p-Block Elements>Group 13 Elements: The Boron Family

The alkaline earth metal sulphate, which has its hydration enthalpy greater than its lattice energy is

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Chemistry>Inorganic Chemistry>The p-Block Elements>Group 13 Elements: The Boron Family

Which statements about Boron and its compounds, among the following are true?
(i) Boron has high density and good electrical conductivity.
(ii)

{}^{10}B

isotope metal borides are useful as protective shields in nuclear industry.
(iii) Borax and boric acid are used in the manufacture of glasses.
(iv) Orthoboric acid is toxic and hence not useful in antiseptic solutions.

When Diborane B2H6 reacts with O2 and H2O independently, then products formed are:

Important Questions on The p-Block Elements

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When Diborane $(B_{2} H_{6})$ reacts with $O_{2}$ and $H_{2} O$ independently, then products formed are: