(A) $Al(OH)_3$ is an amphoteric hydroxide. It is insoluble in weak bases like $NH_4OH$ but dissolves in strong bases like $NaOH$ due to the formation

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If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

(A) $Al(OH)_3$ is an amphoteric hydroxide. It is insoluble in weak bases like $NH_4OH$ but dissolves in strong bases like $NaOH$ due to the formation of a soluble complex,sodium meta-aluminate $(NaAlO_2)$.The reaction is: $NaOH + Al(OH)_3 \to NaAlO_2 + 2H_2O$.Since $NaOH$ is a strong alkali,it provides a high concentration of $OH^-$ ions,which is necessary to dissolve the amphoteric $Al(OH)_3$. Thus,the Reason correctly explains the Assertion.

Class 11 Chemistry s-Block Elements Mix Examples of s-Block Elements

Medium

Assertion : $Al(OH)_3$ is insoluble in $NH_4OH$ but soluble in $NaOH$.
Reason : $NaOH$ is a strong alkali.

AIIMS 1997 All AIIMS

A
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
B
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
C
If the Assertion is correct but Reason is incorrect.
D
If both the Assertion and Reason are incorrect.

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Mix Examples of s-Block Elements

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AIIMS 1997 Paper All AIIMS years →

To distinguish between $A$ and $B$,it is observed that both elements form oxides,but $B$ also forms a nitride when burnt in air. What are $A$ and $B$?

Easy

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Present a comparative account of the alkali and alkaline earth metals with respect to the following characteristics :
$(a)$ Tendency to form ionic/covalent compounds.
$(b)$ Nature of oxides and their solubility in water.
$(c)$ Formation of oxosalts.
$(d)$ Solubility of oxosalts.
$(e)$ Thermal stability of oxosalts.

Difficult

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Match the average fundamental compounds with their proper percentage present in Portland cement.

Compound Percentage proportion

$1. CaO$ $d. 50-60\%$

$2. Al_2O_3$ $a. 5-10\%$

$3. SO_3$ $b. 1-3\%$

Medium

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Match the following columns:

Column-$I$ Column-$II$

$(i)$ Solvay process $(p)$ $Na_2O$

$(ii)$ Evolve $CO_2$ on heating $(q)$ $Na_2O_2$

$(iii)$ Aqueous solution is not neutral towards litmus $(r)$ $NaHCO_3$

$(iv)$ Used as air purifier in submarine $(s)$ $Na_2CO_3$

Column-$I$	Column-$II$
$(i)$ Solvay process	$(p)$ $Na_2O$
$(ii)$ Evolve $CO_2$ on heating	$(q)$ $Na_2O_2$
$(iii)$ Aqueous solution is not neutral towards litmus	$(r)$ $NaHCO_3$
$(iv)$ Used as air purifier in submarine	$(s)$ $Na_2CO_3$

Medium

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What is the product obtained when one mole of magnesium nitride is reacted with excess water?

Easy

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Compound	Percentage proportion
$1. CaO$	$d. 50-60\%$
$2. Al_2O_3$	$a. 5-10\%$
$3. SO_3$	$b. 1-3\%$

Assertion : $Al(OH)_3$ is insoluble in $NH_4OH$ but soluble in $NaOH$.Reason : $NaOH$ is a strong alkali.

Similar Questions

To distinguish between $A$ and $B$,it is observed that both elements form oxides,but $B$ also forms a nitride when burnt in air. What are $A$ and $B$?

Match the average fundamental compounds with their proper percentage present in Portland cement. Compound Percentage proportion $1. CaO$ $d. 50-60\%$ $2. Al_2O_3$ $a. 5-10\%$ $3. SO_3$ $b. 1-3\%$

Match the following columns: Column-$I$ Column-$II$ $(i)$ Solvay process $(p)$ $Na_2O$ $(ii)$ Evolve $CO_2$ on heating $(q)$ $Na_2O_2$ $(iii)$ Aqueous solution is not neutral towards litmus $(r)$ $NaHCO_3$ $(iv)$ Used as air purifier in submarine $(s)$ $Na_2CO_3$

What is the product obtained when one mole of magnesium nitride is reacted with excess water?

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Assertion : $Al(OH)_3$ is insoluble in $NH_4OH$ but soluble in $NaOH$.
Reason : $NaOH$ is a strong alkali.

Match the average fundamental compounds with their proper percentage present in Portland cement.

Compound Percentage proportion

$1. CaO$ $d. 50-60\%$

$2. Al_2O_3$ $a. 5-10\%$

$3. SO_3$ $b. 1-3\%$

Match the following columns:

Column-$I$ Column-$II$

$(i)$ Solvay process $(p)$ $Na_2O$

$(ii)$ Evolve $CO_2$ on heating $(q)$ $Na_2O_2$

$(iii)$ Aqueous solution is not neutral towards litmus $(r)$ $NaHCO_3$

$(iv)$ Used as air purifier in submarine $(s)$ $Na_2CO_3$