Question 1
In the picture representing binary hydride AH
x, lightly-shaded spheres represent H atoms or ions and darkly-shaded spheres represent atoms or ions of the other element, A. The oxidation state of hydrogen and the oxidation state of element A in the binary hydride shown below are

◦ +1 and -1.
◦ -1 and +1.
◦ -1 and +3.
◦ +1 and -3.
Question 2
In the picture representing binary hydride AH
x, lightly-shaded spheres represent H atoms or ions and darkly-shaded spheres represent atoms or ions of the other element, A. If A is a second-period element, the oxidation state of hydrogen and the oxidation state of element A in the binary hydride shown below are

◦ +1 and -1.
◦ -1 and +3.
◦ -1 and +1.
◦ +1 and -2.