Chemistry
What do you understand by precipitation reaction? Explain with an example.
Chemical Reaction
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Answer
A chemical reaction in which two compounds in their aqueous state react to form an insoluble salt (precipitate) as one of the products is called a precipitation reaction.
Example: Take a solution of silver nitrate in a test tube and add dil. hydrochloric acid. A curdy white ppt. is formed.
AgNO3 + HCl ⟶ AgCl ↓ + HNO3
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Related Questions
Samples of four metals A, B, C and D are taken and were added to the following solutions one by one. The results obtained have been tabulated as follows :
Solution to which metal is added
Metal Iron (II) sulphate Copper (II) sulphate Zinc sulphate Silver nitrate A No reaction Displacement ----- ----- B Displacement ----- No reaction ----- C No reaction No reaction No reaction Displacement D No reaction No reaction No reaction No reaction Use the table given above to answer the following questions:
(a) Which is the most reactive metal ?
(b) What would you observe when B is added to solution of copper (II) sulphate ?
(c) Arrange the metals A, B, C and D in order of increasing reactivity.
(a) Define neutralization reaction with an example.
(b) Give a balanced equation for this reaction.
(c) Give three applications of neutralization reactions.
(a) What are double displacement reactions?
(b) Give an example of a double displacement reaction, where gas is evolved.
State the type of reactions each of the following represent and balance the ones that are not balanced.
(a) Cl2 + 2KBr ⟶ 2KCl + Br2
(b) NaOH + HCl ⟶ NaCl + H2O
(c) 2HgO ⟶ 2Hg + O2 ↑
(d) Fe + CuSO4 ⟶ FeSO4 + Cu
(e) PbO2 + SO2 ⟶ PbSO4
(f) 2KClO3 ⟶ 2KCl + 3O2 ↑
(g) 2H2O2 ⟶ 2H2O + O2 ↑
(h) KNO3 + H2SO4 ⟶ HNO3 + KHSO4
(i) CuO + H2 ⟶ Cu + H2O
(j) CaCO3 ⟶ CaO + CO2 ↑
(k) NH4Cl ⟶ NH3 + HCl
(l) PbO + 2HNO3 ⟶ Pb(NO3)2 + 2H2O
(m) AgNO3 + NaCl ⟶ AgCl ↓ + NaNO3