Write word equations and then balanced equations for the reaction taking place when :(a) dilute sulphuric acid reacts with zinc granules.(b) dilute hydrochloric acid reacts with magnesium ribbon.(c) dilute sulphuric acid reacts with aluminium powder.(d) dilute hydrochloric acid reacts with iron filings.

Question:

Write word equations and then balanced equations for the reaction taking place when :

(a) dilute sulphuric acid reacts with zinc granules.

(b) dilute hydrochloric acid reacts with magnesium ribbon.

(d) dilute hydrochloric acid reacts with iron filings.

Answer:

(a) Dilute sulfuric acid reacts with zinc granules and forms zinc sulphate and hydrogen gas.

H₂SO₄ (aq) + Zn (s) → ZnSO₄ (aq) + H₂ (g)

(b) Dilute hydrochloric acid reacts with magnesium ribbon to form magnesium chloride and hydrogen gas.

2HCL (aq) + Mg (s) → (aq) + H₂ (g)

(c) Dilute sulfuric acid reacts with aluminium powder to form aluminium sulphate and hydrogen gas.

3H₂SO₄ (aq) + 2Al (s) → Al₂(SO₄)₃ (aq) + H₂ (g)

(d) Dilute hydrochloric acid reacts with iron filings and forms ferric chloride and hydrogen gas.

6HCl (aq) + Fe (s) → 2FeCl₃(aq) + H₂ (g)

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Give two important uses of washing soda and baking soda.

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Fresh milk has a pH of 6. How do you think the pH will change as it turns into curd? Explain your answer.

Equal lengths of magnesium ribbons are taken in test tubes A and B. Hydrochloric acid (HCl) is added to test tube A, while acetic acid (CH3COOH) is added to test tube B. Amount and concentration taken for both the acids are same. In which test tube will the fizzing occur more vigorously and why?

Five solutions A, B, C, D and E when tested with universal indicator showed pH as 4 , 1 , 11 , 7 and 9, respectively. Which solution is : (a) Neutral? (b) Strongly alkaline? (c) Strongly acidic? (d) Weakly acidic? (e) Weakly alkaline? Arrange the pH in increasing order of hydrogen-ion concentration.

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A solution turns red litmus blue, its pH is likely to be : (a) 1 (b) 4 (c) 5 (d) 10

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Name the sodium compound which is used for softening hard water.

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What effect does the concentration of H+ (aq) ions have on the nature of the solution?

You have two solutions, A and B. The pH of solution A is 6 and pH of solution B is 8. Which solution has more hydrogen ion concentration? Which of this is acidic and which one is basic?

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How is the concentration of hydroxide ions (OH–) affected when excess base is dissolved in a solution of sodium hydroxide?

How is the concentration of hydronium ions (H3O+) affected when a solution of an acid is diluted?

While diluting an acid, why is it recommended that the acid should be added to water and not water to the acid?

Why does dry HCl gas not change the colour of the dry litmus paper?

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