Question

answrr plz both ques

Answer 1

A.23.  feso4+al----al2(so4)3+fe
this is because aluminium occurs before iron in the metal activity series....
while
feso4+cu------no change
bcoz iron occurs before copper in the metal activity series.....

A.22.  bases are chemical compounds which react with acids to give salt and water only...
NAOH + Zn------Na2ZnO2+ H2
Na2ZnO2 ----sodium zincate....


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Answer 2

Bases are substances which releases hydroxide OH(-ve) ions when dissolved in water.
They are of two types.
1) Strong bases - which produce high concentration of hydroxide ions,in aqueous solution.
Example- sodium hydroxide, potassium hydroxide.
2) Weak bases - which produce a low concentration of hydroxide ions,in aqueous solution.
Example- copper hydroxide Cu(OH )2 ammonium hydroxide ( NH4 OH) .
FeSO4 and copper metal will show displacement reaction because, in displacement reaction when one element displaces another element from a compound takes it's place.
Here the same reaction occurs;
Fe + CuSO4 ------> FeSO4 +Cu ( goes up in the form of gas .
Means Fe ( iron ) takes the place of Cu from the whole compound and displacement reaction takes place.
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