Question

Which statements are true? na+ is formed from the reduction of na(s). the oxidation number for hg(????) is 0. the oxidation number for cu(s) is +2. zn2+ is formed from the oxidation of zn(s). a reducing agent gains electrons. an oxidizing agent gains electrons?

Answer 1

Following are True among given options;

1) The oxidation number for Hg(l) is 0:
                                                            It is correct as Mercury is present in its standard state and has a zero oxidation number.

2) Zn⁺² is formed from the oxidation of Zn (s):
                                                            This statement is correct as an element when looses electron gets positive charge. In this case the oxidation number of Zn has changed from 0 to +2, hence, it has lost 2 electrons and is oxidized.

3) An oxidizing agent gains electrons:
                                                           This statement is correct because Oxidizing agents are those compounds which gains electron from other substance making them oxidized and getting themselves reduced.

Answer 2

Regarding redox reactions, it is true that:

• The oxidation number for Hg(l) is 0.
• Zn²⁺ is formed from the oxidation of Zn(s).
• An oxidizing agent gains electrons.

Let's consider which statements are true.

• Na⁺ is formed from the reduction of Na(s). FALSE. Na⁺ is formed by the oxidation of Na(s) (Na loses 1 electron).
• The oxidation number for Hg(l) is 0. TRUE. For a monoatomic element, the oxidation number coincides with the charge.
• The oxidation number for Cu(s) is +2. FALSE. The oxidation number of Cu(s) is 0.
• Zn²⁺ is formed from the oxidation of Zn(s). TRUE. Zn(s) loses 2 electrons to form Zn²⁺.
• A reducing agent gains electrons. FALSE. A reducing agent loses electrons.
• An oxidizing agent gains electrons. TRUE. An oxidizing agent gains electrons. and is reduced.

Regarding redox reactions, it is true that:

• The oxidation number for Hg(l) is 0.
• Zn²⁺ is formed from the oxidation of Zn(s).
• An oxidizing agent gains electrons.

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