give 10 example for the following
change in state,
change in colour,
change in temperature,
from in precipitate,
evolution of gas.
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Explanation:
change in state - oxygen (g)+ magnesium(s)----》 magnesium oxide(s).
change in colour - copper sulphate ( blue)+ iron (grey)----》 iron sulphate(green) + copper(red)
change in temp. - zinc + HCl----》 zinc chloride + Hydrogen
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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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