write the chemical equation of the reaction in which the changes have taken place with an example of each
1 Indian colour
2 change in temperature
3 formation of precipitation
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Answer:
change in colour:- Pb(No3)2(aq)+2kl--PbI2(s)+2KnO3
change in temperature
Zn(s)+H2SO4(aq)-- ZnSO4(aq)+H2
formation and precipitate:-
BaCl2+Na2So4--BASO4+ 2NACL
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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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