Give one example each of a chemical reaction showing the follow characteristics. (A) evolution of a gas (b) change of colour (c,) formation of precipitate
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Evolution of a gas _ carbonic acid breaks down to water and carbon dioxide.
Change of colour _ copper reacts with oxygen, h2o and co2 to give copper carbonate which changes colour from brown to blue or blue green.
Formation of precipitate _ some time pipes in our home get clogged because precipitate of Mg and calcium oxides have deposited themselves within the pipe
Change of colour _ copper reacts with oxygen, h2o and co2 to give copper carbonate which changes colour from brown to blue or blue green.
Formation of precipitate _ some time pipes in our home get clogged because precipitate of Mg and calcium oxides have deposited themselves within the pipe
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Answer:
1. Change in colour :
The reaction between lead nitrate solution and poassium iodide solution.
Chemical equation as follow :
Pb ( NO₃ )₂ + 2 KI ⇒ PbI₂ + 2 KNO₃
In above reaction colour change from colourless to yellow.
2. Change in temperature :
The reaction between dil. sulphuric acid on zinc.
Chemically :
Zn + H₂SO₄ ⇒ ZnSO₄ + H₂
Heat evolved in the above reaction.
3. Formation of precipitation :
The reaction between barium chloride on sodium sulphate.
Chemically :
BaCl₂ + Na₂SO₄ ⇒ BaSO₄ + 2 NaCl
In the above reaction white ppt. of BaSO₄ will form.
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