Topic content:
There is chemistry everywhere in our life. Through the chemical knowledge we have learned, we can judge the correct way to do the following:
A. Although pickles contain nitrite, it's OK to eat more
B. To prevent "white pollution", waste plastics shall be collected and burned in the field
C. Aquatic products can be kept fresh after being soaked in formaldehyde solution
D. Iron fortified soy sauce helps prevent iron deficiency anemia
Best answer:
D
Answer analysis:
A、 Nitrite is an industrial salt, which is toxic, so pickled pickles contain nitrite, which should be eaten less. Error. B. Waste plastics are concentrated in the field and burned, causing air pollution. Error. C. Formaldehyde aqueous solution will denature protein, so aquatic products are prohibited to be sold after soaking in formaldehyde aqueous solution. Error. D Iron deficiency in human body can cause anemia, so eating iron fortified soy sauce can help prevent iron deficiency anemia. Correct, so choose D
Test core:
The existence form of elements in human body:
① Carbon, hydrogen, oxygen and nitrogen mainly exist in the form of water, sugar, protein, vitamins and fat.
② Other elements mainly exist in aqueous solution in the form of inorganic salts.
③ Calcium element mainly exists in the form of hydroxycalcium phosphate [Ca10 (PO4) 6 (OH) 2] crystal.