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grigory [225]
3 years ago
6

Identify the oxidizing agent and the reducing agent in the following:

Chemistry
1 answer:
Sergeeva-Olga [200]3 years ago
8 0

Explanation:

Oxidizing agent is the reactant in the chemical reaction which oxidizes others and reduces itself.

Reducing agent is the reactant in the chemical reaction which reduces others and oxidizes itself.

(a) In the given reaction :-

8H^+_{(aq)} + [Cr_2O_7]^{2-}_{(aq)} + 3SO_3^{2-}_{(aq)}\rightarrow 2Cr^{3+}_{(aq)} + 3SO_4^{2-}_{(aq)} + 4H_2O_{(l)}

Cr exists in +6 oxidation state in [Cr_2O_7]^{2-} and forms Cr^{3+} in which it has +3 oxidation state.

Thus, it is reduced in the chemical reaction. Thus, [Cr_2O_7]^{2-} is oxidizing agent and SO_3^{2-} is the reducing agent.

(b) In the given reaction :-

NO_3^-_{(aq)} + 4Zn_{(s)} + 7OH^-_{(aq)} + 6H_2O_{(l)}\rightarrow 4Zn(OH)_4^{2-}_{(aq)} + NH_3_{(aq)}

Zn exists in 0 oxidation state in Zn and forms Zn(OH)_4^{2-} in which it has +2 oxidation state.

Thus, it is oxidized in the chemical reaction. Thus, Zn is reducing agent and NO_3^- is the oxidizing agent.

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1 point
monitta

Answer: C) a redox reaction that produces an electric current

Explanation:

Chemical cell is a device which is used for the conversion of the chemical energy produced in a redox reaction into the electrical energy. The cell consists of the negative terminal called as anode where oxidation takes place and a positive terminal called as cathode where reduction takes place.

Electrolytic cell is a device which is used to carry out chemical reactions by the use of electrical energy. The cell consists of the negative terminal called as cathode where reduction takes place and a positive terminal called as anode where oxidation takes place.

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Which of the following equations does not demonstrate the law of conservation of mass?
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The third option does not obey the law of conservation of mass.

Option 3.

Explanation:

The law of conservation of mass states that the sum of the masses of reactants should be equal to the sum of the masses of the products.

For example, if we consider the first option to verify if it obeys law of conservation of mass or not, 2 Na + Cl₂ → 2 NaCl

So one way to verify it is to find the mass of Na, then multiply it with 2, and then add this with 2 times of mass of chlorine. So this sum should be equal to the 2 times mass of NaCl. But it is somewhat lengthy.

Another way to easily determine this is to check if the elements are present equally in both sides. Such as, in reactant side and product side 2 atoms of Na is present . Similarly, the Cl atoms are also present in equal number in both reactant and product side. Thus this obeyed the law of conservation of mass.

Like this, if we see the second option, there also 1 atom of Na is present in reactant and product side and 2 molecules of H is present in reactant and product side, 1 oxygen is present in reactant and product side and 1 Cl is present in reactant and product side. So it also obeys the law of conservation of mass.

But in the third option, P₄ + 5 O₂→ 2 P₄O₁₀, here, there is 4 atoms of P in reactant side but in product side there is (4*2) = 8 atoms of P. Similarly, the number of atoms of oxygen in reactants and product side is also not same. So the third option does not obey the law of conservation of mass.

The fourth option also obeys the law of conservation of mass as the number of atoms of each element is same in both the product and reactant side.

Thus, the third option does not obey the law of conservation of mass.

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