Write the chemical equation of the reaction with an example in which the following 1. Change has taken place 2. Change in colour 3. Formation of precipitation
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Lead nitrate+Potassium iodide gives lead iodide+Potassium nitrate
Pb(NO3)2+2KI gives PbI2+2KNO3
Both are colourless and clear
when we add both the solutions we observe that at once a yellow precipitate is formed due to formation of lead iodide
Pb(NO3)2+2KI gives PbI2+2KNO3
Both are colourless and clear
when we add both the solutions we observe that at once a yellow precipitate is formed due to formation of lead iodide
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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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