Chemistry 9th Chap 6 : Topic 10 - Maryam Publications

Chemistry Chapter 6 : Topic 10

Symbol Equations

1 / 10

A student adds dilute hydrochloric acid to calcium carbonate chips in a test tube. Effervescence is observed and a colorless gas is released. Which correctly represents the balanced symbol equation with state symbols?

A) CaCO₃(s)+2HCl(aq) → CaCl₂(aq)+H₂O(l)+CO₂(g)

B) CaCO₃(aq)+HCl(l) → CaCl₂(w)+H₂O(g)+CO₂(aq)

C) CaCO₃(s)+2HCl(g) → CaCl₂(l)+H₂O(aq)+CO₂(s)

D) CaCO₃(s)+HCl(aq) → CaCl₂(aq)+H₂O(l)+CO₂(g)

2 / 10

When aqueous solutions of silver nitrate and sodium chloride are mixed, a white precipitate forms immediately. Which equation correctly represents the reaction?

A) AgNO₃(s)+NaCl(s) → AgCl(aq)+NaNO₃(s)

B) AgNO₃(aq)+NaCl(aq) → AgCl(s)+NaNO₃(aq)

C) AgNO₃(aq)+NaCl(l) → AgCl(g)+NaNO₃(aq)

D) AgNO₃(aq)+NaCl(aq) → AgCl(aq)+NaNO₃(aq)

3 / 10

Methane gas burns completely in excess oxygen producing carbon dioxide and water. Which is the correct equation?

A) CH₄(l)+O₂(aq) → CO₂(aq)+H₂O(g)

B) CH₄(g)+2O₂(g) → CO₂(g)+2H₂O(l)

C) CH₄(g)+O₂(g) → CO₂(g)+H₂O(g)

D) CH₄(g)+2O₂(g) → CO₂(s)+H₂O(g)

4 / 10

Zinc metal is placed in dilute sulfuric acid. Hydrogen gas evolves and zinc sulfate is formed in solution. The correct equation is:

A) Zn(g)+H₂SO₄(aq) → ZnSO₄(aq)+H₂(l)

B) Zn(s)+H₂SO₄(s) → ZnSO₄(l)+H₂(g)

C) Zn(aq)+H₂SO₄(l) → ZnSO₄(s)+H₂(aq)

D) Zn(s)+H₂SO₄(aq) → ZnSO₄(aq)+H₂(g)

5 / 10

During a neutralization reaction, aqueous sodium hydroxide reacts with hydrochloric acid forming salt and water. Which equation is correct?

A) NaOH(l)+HCl(aq) → NaCl(s)+H₂O(aq)

B) NaOH(aq)+ HCl(aq) → NaCl(aq)+H₂O(l)

C) NaOH(s)+ HCl(s) → NaCl(l)+H₂O(g)

D) NaOH(aq)+HCl(g) → NaCl(g)+H₂O(s)

6 / 10

Iron filings are added to copper sulfate solution. Copper metal is displaced and iron sulfate is formed. Which equation is correct?

A) Fe(g)+CuSO₄(aq) → FeSO₄(aq)+Cu(g)

B) Fe(s)+CuSO₄(aq) → FeSO₄(aq)+Cu(s)

C) Fe(s)+CuSO₄(l) → FeSO₄(g)+Cu(l)

D) Fe(aq)+CuSO₄(s) → FeSO₄(s)+Cu(aq)

7 / 10

On heating calcium carbonate strongly, it decomposes into calcium oxide and carbon dioxide. Which equation is correct?

A) CaCO₃(l) → CaO(s)+CO₂(s)

B) CaCO₃(g) → CaO(g)+CO₂(aq)

C) CaCO₃(s) → CaO(s)+CO₂(g)

D) CaCO₃(aq) → CaO(aq)+CO₂(l)

8 / 10

A student adds dilute acid to a metal carbonate and collects a gas that turns lime water milky. Which equation is correct?

A) Na₂CO₃(s)+2HCl(aq) → 2NaCl(aq)+H₂O(l)+CO₂(g)

B) Na₂CO₃(l)+HCl(aq) → NaCl(g)+H₂O(s)

C) Na₂CO₃(aq)+HCl(l) → NaCl(s)+CO₂(aq)

D) Na₂CO₃(l)+HCl(g) → NaCl(aq)+CO₂(s)

9 / 10

Which option correctly identifies the state symbols for a soluble ionic compound in water?

A) It becomes (g) after dissolving

B) It exists as (aq) due to dissociation into ions

C) Solid ionic compound remains (s) in solution

D) It becomes (l) after dissolving

10 / 10

Which statement is most important when deducing a symbol equation from given information?

A) Only reactants need correct formulas

B) Products should always be gases

C) State symbols are optional in all reactions

D) Chemical symbols, formulas, balancing, and state symbols must all be correct

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