How would you justify that a chemical reaction has taken place in the following cases:
(i) Burning of magnesium ribbon in air.
(ii) Addition of lead nitrate solution to potassium iodide solution.
(iii) Addition of dilute hydrochloric acid to zinc granules.

Question

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Anonymous · Accepted Answer

(i) Burning of magnesium ribbon in air gives a powder (of MgO). So there is a change of state.

Magnesium + Oxygen --> Magnesium oxide(MgO)

(ii) Addition of colourless lead nitrate solution to potassium iodide solution gives yellow
coloured precipitate (lead iodide). So there is a change of colour.

(iii) Addition of dilute hydrochloric acid to zinc granules gives a gas (H₂) with effervescence.

Chemical Reactions and Equations

How would you justify that a chemical reaction has taken place in the following cases:(i) Burning of magnesium ribbon in air.(ii) Addition of lead nitrate solution to potassium iodide solution.(iii) Addition of dilute hydrochloric acid to zinc granules.

How would you justify that a chemical reaction has taken place in the following cases:
(i) Burning of magnesium ribbon in air.
(ii) Addition of lead nitrate solution to potassium iodide solution.
(iii) Addition of dilute hydrochloric acid to zinc granules.