Write the chemical equation of the reaction in which the following changes have taken place with an example of each (1) change in colour(2)change in temperature (3)
formation of precipitation
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A) fe+cuso3--feso3+cu
B)Na+H2o--Nao +H2
C)Co2+quick lime--milky precipitate
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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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