Class X

Which of the following is not a balanced equation?
  1. Zn+S→ZnS
  2. Fe+Cl₂→FeCl₃
  3. Mg+CuSO₄→MgSO₄+C₄
  4. NaOH+HCl→NaCl+H₂O
Which of the following reactions is not correct
  1. Mg+2HCl→MgCl₂+H₂
  2. Fe+CuSO₄→FeSO₄+Cu₄
  3. Zn+CuSO₄→ZnSO₄+Cu
  4. 2Ag+Cu(NO₃)₂→2AgNO₃+Cu
The reaction H ₂+Cl ₂→2HCl represents:
  1. Oxidation
  2. Reduction
  3. Combination
  4. Decomposition
The reaction H₂+Cl ₂→ 2HCl represents :
  1. Combination
  2. Oxidation
  3. Reduction
  4. None of these
Copper displaces which of the following metals from its salt solution:
  1. ZnSO₄
  2. FeSO₄
  3. NiSO₄
  4. AgNO₃
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