Assign oxidation states to the elements whose atoms are underlined in each of the following compounds or ions:
(a) KNOz
(b) H2POA
(c) NHA*
(d) AlHa
(a) In KNOz, the oxidation state of K is +1, the oxidation state of N is +5, and the oxidation state of O is -2.
(b) In H2POA, the oxidation state of H is +1, the oxidation state of P is +5, and the oxidation state of O is -2.
(c) In NHA*, the oxidation state of N is -3, the oxidation state of H is +1, and the oxidation state of A is unknown as it is not specified.
(d) In AlHa, the oxidation state of Al is +3, and the oxidation state of H is -1.