Question

Give one example each of a chemical reaction showing the following characteristics. a. evolution of a gas b. change of colour c. formation of precipitate d. change of state from liquid to gas change of state from gas to liquid​

Answer 1

Answer:

Explanation:

Chemical reactions: The process by which one or more substances transform into new substances and in which old bonds break and new bonds form is called Chemical reaction.

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A} Example of chemical reaction showing evolution of gas are:-

• Zinc + Hydrochloric acid ----> Hydrogen gas + zinc Chloride
• Zn + HCl ---->  $H_{2}$ + $ZnCl_{2}$

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B} Example of chemical reaction showing change of color are:-

• Copper Sulfate (blue) + Iron ----> Iron Sulphate (greenish) + Copper

    *  .$CuSO_{4} (blue) + Fe --> FeSO_{4} (greenish) + Cu$

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C} Example of chemical reaction showing formation of precipitate are:-

• Barium Chloride + Sodium Sulphate--> Barium Sulphate(ppt.) + Sodium Chloride
• BaCl + NaS$O_{4}$ ----> BaS$O_{4}$ + NaCl

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D} Example of chemical reaction showing change of state from liquid to gas are:-

• $H_{2}O$ + heat ----> $H_{2}O$ (gas)

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E} Example of chemical reaction showing change of state from gas to liquid​ are:-

• Hydrogen (gas) + Oxygen (gas) ----> Water (liquid)
• $H_{2}O$ (gas) + $O_{2}$ (gas) ---> $H_{2}O$ (liquid)