Question

Which choice correctly identifies the oxidation numbers (O.N.) for each element in Ca(NOs)2? A) Ca = 0, N= 0,0 =0 B) Ca = 0,N=+5,0 =-2 C) Ca = +2,N=+5,0 =-6 D) Ca = +2, N=+5,0 = -2

E) Ca = +4, N =+5,0 =-2

Answer 1

The correct oxidation numbers for Ca(NOs)2 are Ca = +2, N = +5, and O = -2.

Step-by-step explanation:

The correct choice is D) Ca = +2, N=+5, 0 = -2.

According to the rules for assigning oxidation numbers:

1. The oxidation number for elements in their elemental form is always 0. Therefore, Ca has an oxidation number of 0.
2. Oxygen is usually assigned an oxidation number of -2. Therefore, the oxide ion (O2) has an oxidation number of -2.
3. The sum of the oxidation numbers in a compound must equal the overall charge of the compound.

In Ca(NO3)2, the oxidation number for Ca is +2 because it is a Group 2 element. The oxidation number for NO3 is -2 (from the oxygen) and the overall charge on the NO3 ion is -1. Therefore, the oxidation number for N in NO3 is +5 to balance the equation: x + 3(-2) = -1.

So, the correct oxidation numbers for Ca(NOs)2 are: Ca = +2, N = +5, and O = -2.

Answer 2

The correct oxidation numbers for Ca, N, and O in Ca(NOs)2 are +2, +5, and -2, respectively.

Step-by-step explanation:

The correct choice that identifies the oxidation numbers (O.N.) for each element in Ca(NOs)2 is D) Ca = +2, N=+5, O = -2. Here's the breakdown:

1. Ca (Calcium) is a Group 2 element, which means it has an oxidation number of +2.
2. N (Nitrogen) is a Group 15 element, and in this compound, it has an oxidation number of +5.
3. O (Oxygen) is normally assigned an oxidation number of -2, and there are two oxygen atoms in this compound.

Therefore, the correct oxidation numbers for Ca, N, and O in Ca(NOs)2 are +2, +5, and -2, respectively.