Bright Tutorials Bright Tutorials
ICSE Class 9 Chemistry Question 16 of 24

Model Question Paper — 1 — Question 14

Back to all questions
14
Question

Question 6(b)

Al2O3 is the formula of Aluminium oxide. Write the formulae of :

(i) Aluminium nitrate

(ii) Aluminium phosphate

Answer

(i) Formula of aluminium nitrate

Al3+↗NO31−Al33 ↘↙ N1O3⇒Al21 ↘↙ N3O3\text{Al}^{3+} \phantom{\nearrow} \text{NO}_{3}^{1-} \\[0.5em] \overset{\phantom{3}{3}}{\text{Al}} \space {\searrow}\mathllap{\swarrow} \space \overset{1}{\text{N}}\text{O}_{3} \Rightarrow \underset{\phantom{2}{1}}{\text{Al}} \space {\searrow}\mathllap{\swarrow} \space \underset{3}{\text{N}}\text{O}_{3} \\[0.5em]

So, we get the formula as Al(NO3)3\bold{Al}\bold{(NO}_{\bold{3}}\bold{)}_\bold{3}

(ii) Formula of aluminium phosphate

Al3+↗PO43−Al33 ↘↙ P3O4⇒Al21 ↘↙ P1O4\text{Al}^{3+} \phantom{\nearrow} \text{PO}_{4}^{3-} \\[0.5em] \overset{\phantom{3}{3}}{\text{Al}} \space {\searrow}\mathllap{\swarrow} \space \overset{3}{\text{P}}\text{O}_{4} \Rightarrow \underset{\phantom{2}{1}}{\text{Al}} \space {\searrow}\mathllap{\swarrow} \space \underset{1}{\text{P}}\text{O}_{4} \\[0.5em]

So, we get the formula as AlPO4\bold{Al}\bold{PO}_{\bold{4}}