There are four questions in the chemical experiment operation examination of a school in our city: ① purification of crude salt, ② exploration of the chemical properties of acid, ③ preparation, collec

There are four questions in the chemical experiment operation examination of a school in our city: ① purification of crude salt, ② exploration of the chemical properties of acid, ③ preparation, collection and inspection of carbon dioxide, (1) With regard to the identification of commonly used experimental instruments, the title gives two commonly used instruments in the laboratory: an iron shelf and a beaker;

(2) We should make full use of the information given in the stem, and combine the stem of "Instruments and Drugs Provided by Experimental Platform" to screen them one by one by exclusion method.

① Lack of funnel, glass rod and other equipment, ② lack of inspection chemicals and ④ lack of oxygen-making drugs.

(3) Fully combining the information given in the figure, we eliminated them one by one, and found that ② and ④ operations were wrong. One took the liquid without the cork upside down, and the other put the burning match in the bottle when it was full.

(4) If hydrogen peroxide and manganese dioxide are used to prepare oxygen in the laboratory, this device can generally be used.

So the answer is:

(1) iron shelf; Beakers.

(2)③.

(3) When the liquid is taken in step (2), the bottle stopper is not inverted; In step 4, when the bottle is full, put the burning match into the bottle.

(4) oxygen.