Al is costlier than Fe but Al is sacrificed to convert Fe_2O_3 into Fe . \Delta\,G^{\circ}_f(Fe_2O_3)\, =\, -742.2\, kJ\, mol^{-1}\quad \Delta\,G^{\circ}_f(Al_2O_3)\,=\,-1582\, kJ\, mol^{-1} Write the reaction involved and comment on the feasibility of the reaction.

A displacement reaction takes place between Fe and Al, where Al replaces Fe from its oxide ( Fe_2O_3 ).The balanced chemical equation is: 2 Al(s) + Fe_2O_3(s) \rightarrow 2Fe(s) + Al_2O_3(s) \Delta G = \Delta G_{product} - \Delta G_{reactant} =\Delta G_{Al_2O_3} +2 \Delta G_{Fe} -\Delta G_{Fe_2O_3} -2\Delta G_{Al} = -1582+0-(-742.2) - 0= -840\ kJ The reaction is spontaneous ( \Delta G _{rexn}<0 ) and hence feasible.

Consider {Al_2(OH)_6} compound and calculate the value of \dfrac{(X+Y)}{Z}, where:X=Total number of {(2c-2e^{-})} bondY=Total number of {(3c-2e^{-})} bondZ= Total number of {(3 c-4 e^{-})} bond

X = Total number of (2c - 2e^-) bond = 10 Y = Total number of (3c - 2e^-) bond = 0 Z - Total number of (3c - 4e^-) bond = 2 \dfrac{(10 + 0)}{ 2} = 5

Some P-Block Elements - Hots Questions

Q: Consider {Al_2(OH)_6} compound and calculate the value of \dfrac{(X+Y)}{Z}, where:X=Total number of {(2c-2e^{-})} bondY=Total number of {(3c-2e^{-})} bondZ= Total number of {(3 c-4 e^{-})} bond

X = Total number of (2c - 2e^-) bond = 10 Y = Total number of (3c - 2e^-) bond = 0 Z - Total number of (3c - 4e^-) bond = 2 \dfrac{(10 + 0)}{ 2} = 5

Q: The number of moles of water of crystallization present per mole of the compound A is:

A is borax or sodium tetraborate (Na_2B_4O_7.10H_2O) .One mole of A contains 10 moles of water of crystallization.It is a white crystalline solid and is used in water softening. Its aqueous solution is alkaline due to the formation of sodium hydroxide upon hydrolysis of Na_2B_4O_7 . The reaction is as follows: Na_2B_4O_7+7H_2O \rightleftharpoons 2NaOH + 4 H_3BO_3 When borax is heated, it loses water and swells into a white mass which is B . The formula is Na_2B_4O_7 . The reaction is as follows: Na_2B_4O_7.10H_2O \xrightarrow {heat} \underset {B} {Na_2B_4O_7} + 10H_2O On further heating, B forms glossy solid called borax glass and borax bead (compound C or B_2O_3 ). The reaction is as follows: Na_2B_4O_7 \xrightarrow {heat} 2NaBO_2 + \underset {C} {B_2O_3} When C is heated with nickel oxide, a brown bead D is obtained which is nickel metaborate (Ni(BO_2)_2) . The reaction is as follows: B_2O_3 + NiO \rightarrow \underset {brown\ \ bead (D)} {(Ni(BO_2)_2)}

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Some P-Block Elements

- Want to test your higher order thinking skills? Practice HOTS from this chapter.

We can easily attempt the questions related to reaction but when it comes to check the feasibility we often skip that part. Here let's solve this question to get confident.

$A l$ is costlier than $F e$ but $A l$ is sacrificed to convert $F e_{2} O_{3}$ into $F e$ .

$Δ G_{f}^{\circ} (F e_{2} O_{3}) = - 742.2 k J m o l^{- 1} Δ G_{f}^{\circ} (A l_{2} O_{3}) = - 1582 k J m o l^{- 1}$

Write the reaction involved and comment on the feasibility of the reaction.

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Questions based on $3 C - 2 e^{-}$ , $2 C - 2 e^{-}$ and $3 C - 4 e^{-}$ and finding their values can be tough and tricky. Let's check your analytical thinking.

Consider

A l_{2} (O H)_{6}

compound and calculate the value of

\frac{( X + Y )}{Z},

where:
X=Total number of

(2 c - 2 e^{-})

bond
Y=Total number of

(3 c - 2 e^{-})

bond
Z= Total number of

(3 c - 4 e^{-})

bond

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I am pretty sure you can definitely solve the questions related to anomalous behaviour of carbon no matter how tough it is. Let's try to solve this tricky question.

Assertion

Carbon has coordination number

(C . N .)

of four while other elements of this group have

C . N .

of six.

Reason

Due to available

d

-orbital in which

(n - 1) p

electrons.can be excited to make

C . N .

of six. Carbon lacks

d -

orbital.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

Assertion is correct but Reason is incorrect.

Both Assertion and Reason are incorrect.

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Do you find difficult to solve questions based on practical part. Let's break this ice and get this question done.

The number of moles of water of crystallization present per mole of the compound

A

is:

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