give an eg for each reaction. 1evolution of gas 2.formation of precipitate.3change in temperature. 4change in state change in colour .. and make 2these eg balanced ..
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evolution of gas- Zn +H2SO4 ---) ZnSo4 + H2 (gas evolved)
Formationof precipitate - AgNo3 + NaCl --) AgCl (formation of precipitate) + NaNO3
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AgBr2 -----) Ag+ Br2
Formationof precipitate - AgNo3 + NaCl --) AgCl (formation of precipitate) + NaNO3
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AgBr2 -----) Ag+ Br2
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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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