Question

Расставьте степени окисления:Al203CaSCr2O3H2SFeCl3Na3PO4Cu(NO3)2

Answer 1

Al2(+3)03(-2)
Ca(+2)S(-2)
Cr2(+3)O3(-2)
H2(+1)S(-2)
Fe(+3)Cl3(-1)
Na3(+1)P(+5)O4(-2)      
Cu(+1)(N(+5)O3(-2))2    

Answer 2

Al2O3: The oxidation state of aluminum (Al) in Al2O3 is +3, and the oxidation state of oxygen (O) is -2.

CaS: The oxidation state of calcium (Ca) in CaS is +2, and the oxidation state of sulfur (S) is -2.

Cr2O3: The oxidation state of chromium (Cr) in Cr2O3 is +3, and the oxidation state of oxygen (O) is -2.

H2S: The oxidation state of hydrogen (H) in H2S is +1, and the oxidation state of sulfur (S) is -2.

FeCl3: The oxidation state of iron (Fe) in FeCl3 is +3, and the oxidation state of chlorine (Cl) is -1.

Na3PO4: The oxidation state of sodium (Na) in Na3PO4 is +1, the oxidation state of phosphorus (P) is +5, and the oxidation state of oxygen (O) is -2.

Cu(NO3)2: The oxidation state of copper (Cu) in Cu(NO3)2 is +2, the oxidation state of nitrogen (N) in nitrate (NO3) is +5, and the oxidation state of oxygen (O) is -2.

Please note that these are the most common oxidation states for these elements in these compounds, but there may be exceptions in certain cases.