Thursday, July 5, 2012

X : 10th Acid Base and Salt:Solved Edugain questi...

chemistry X : 10th Acid Base and Salt:Solved Edugain questions
Q. 1.  What happens if sodium hydroxide is added to cupper  ammonium sulphate solution and what is the inference?

Answer:  When sodium hydroxide is added to cupper  ammonium sulphate solution, no blue precipitate of Cu(OH)2 is seen, which is normally observed for Cu2+ ion. Hence it is an example of a complex salt.
Q 2. When lead dioxide reacts with concentrated HCl and produces a salt and water, the reaction is not called a neutral reaction why?
Answer:  For a reaction to be called a neutral reaction the products should be only salt and water. But in the above reaction, Cl2 gas is also liberated.
Q 3.Define a base and acid in terms of proton.
Answer:  A base is a proton acceptor and an acid is a proton donor.
Q 4. Answer these: 
 1) Name the anions that can be detected in the laboratory using dilute HCl or dilute H2SO4 and give the ionic equation common to both reactions.  
2) Which property of the acid is indicated?
Answer:  
Carbonate and Bicarbonate Ions      2H+  + CO32-  ........>   H2O + CO2 ­

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