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Addition of iron fillings to CuSO4 solution caused precipitation of Cu owing to the
Addition of iron filling to CuSO4 solution caused ppt.of Cu owing to the reduction of Cu2+e.g.
CuSO4 + Fe → FeSO4 + Cu (reduction of copper).
White vitriol has the formula :
ZnSO4.7H2O is White vitriol
FeSO4.7H2O is Green vitriol
CuSO4.5H2O is Blue vitriol
The treatment of Cu with dilute HNO3 gives :
3Cu+ (dil) 8 HNO3 → 3Cu(NO3)2 + 2NO + 4H2O
Bronze is an alloy of :
Bronze is an alloy of Cu and Sn.
When excess of SnCl2 is added to a solution of HgCl2, a white precipitate turning to grey is obtained. This grey colour is due to the formation of
2HgCl2 + SnCl2 → \(\underset{White\, ppt}{HgCl_{2}}\) + SnCl4
Hg2Cl2SnCl2 → \(\underset{grey}{2Hg}\) + SnCl4
Which one of the following is coinage metal ?
Cu, Ag and Au are called coinage metals.
Black jack is an ore of :
Black jack or Zinc blende is ZnS. It is ore of Zn.
Which of the following has lowest percentage of carbon ?
Wrought iron is the purest form of iron containing lowest percentage of C (0.2-0.5%).
Gun metal is an alloy of :
Gun metal is an alloy of Cu, Zn and Sn.It contains 88%Cu, 10% Sn and 2% Zn.
Copper displaces which of the metal from their salt solutions ?
Cu is more electropositive than Ag therefore, it displaces Ag from their salt solution AgNO3.
Cu + 2AgNO3 → Cu(NO3)2 + 2Ag