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Ethnic Vietnam with four thousand year history of building and defending the country, during his long history with the good traditions handed down from generation to generation. One of them is the traditional loving human spirit of solidarity is expressed through the proverb: "aches tear".

As noted above, traditional human love, the spirit of solidarity, mutual assistance difficult times is one of the oldest traditions of our nation.

About proverb, this question has two layers of meaning, in terms of class layers literally means that we can see that it is right in every word that we do not need to infer anything. This class can understand the meaning of a tree, the fresh leaves can "cover" for the leaves do not heal torn to jointly overcome a rain storm that leaves do not fall off the other tear. From this literal class, we can infer the metaphoric layers proverb - a layer that is not shown directly, and the reader must infer based on class literally. With this proverb one can understand its allusions are talking about love, the spirit of solidarity to help each other when in trouble, tribulation. The rich shall help the poor, incomplete, help the needy. There are also many fishing knives, proverbs speak of this spirit as saying: "My Voting trade secrets taken along / But that other varieties but share the same platform," or "government interference that takes the mirror / person in a country must trade together ".

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Thực hiện các thí nghiệm sau:

(1) Cho dung dịch NaCl vào dung dịch KOH.

(2) Cho dung dịch Na₂CO₃ vào dung dịch Ca(OH)₂.

(3) Điện phân dung dịch NaCl với điện cực trơ, có màng ngăn.

(4) Cho Cu(OH)₂ vào dung dịch NaNO₃.

⁽⁵⁾ Sục khí NH₃ vào dung dịch Na₂CO₃.

(6) Cho dung dịch Na₂SO₄ vào dung dịch Ba(OH)₂.

Số thí nghiệm đều tạo ra NaOH là

A. 2.

B. 4.

C. 3.

D. 5.