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ICSE Class 9 Chemistry Question 7 of 24

Model Question Paper — 1 — Question 1

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Question

Question 3(a)

The formula of the chloride of the metal 'M' is MCl3. State the formula of its:

(i) Carbonate

(ii) Hydroxide

Answer

(i) Formula of metal carbonate

M3+↗CO32−M33 ↘↙ C2O3⇒M22 ↘↙ C3O3\text{M}^{3+} \phantom{\nearrow} \text{CO}_{3}^{2-} \\[0.5em] \overset{\phantom{3}{3}}{\text{M}} \space {\searrow}\mathllap{\swarrow} \space \overset{2}{\text{C}}\text{O}_{3} \Rightarrow \underset{\phantom{2}{2}}{\text{M}} \space {\searrow}\mathllap{\swarrow} \space \underset{3}{\text{C}}\text{O}_{3} \\[0.5em]

So, we get the formula as M2(CO3)3\bold{M}_{\bold{2}}\bold{(CO_{\bold{3}}})_{\bold{3}}

(ii) Formula of metal hydroxide

M3+↗OH1−M33 ↘↙ OH1⇒M21 ↘↙ OH3\text{M}^{3+} \phantom{\nearrow} \text{OH}^{1-} \\[0.5em] \overset{\phantom{3}{3}}{\text{M}} \space {\searrow}\mathllap{\swarrow} \space \overset{1}{\text{OH}} \Rightarrow \underset{\phantom{2}{1}}{\text{M}} \space {\searrow}\mathllap{\swarrow} \space \underset{3}{\text{OH}} \\[0.5em]

So, we get the formula as M(OH)3\bold{M}\bold{(OH)}_{\bold{3}}