Question

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7 which reaction represents result of blowing in phenol red solution * (1 نقطة) C6H1206 ------> 2C2H5OH+ 2C02 + ATP C6H12O6 +2CuSO4+4NaOH---boil--- -> Cu2O+2Na2SO4+C6H1207+2H2O CO2+H20 ------> H2CO3------>H+ + -HCO3 none of the above

Answer 1

Option 3 is the correct answer .

This is a test used to detect the presence of CO2 that is evolved in a reaction. This method is used to show that due to cellular respiration in plants , plants also produces a certain amount of carbon dioxide. The colour of the phenol red solution changes to different colours according to the pH and hydrogen ion concentration in the solution. The carbon dioxide will be detected by the changing colour of the phenol red indicator. Phenol red is pink in colour under the alkaline condition that is the hydrogen ion concentration in the solution is very low. As we blow air in the phenol red solution , the co2 reacts with the water present in a solution to form hydrogen ions and the hydrogen bicarbonate ions. Hydrogen ions are acidic in nature. The concentration of the carbon dioxide is increased in the solution which further increase the hydrogen ion concentration the colour of the solution changes to yellow. if Concentration of hydrogen ions is decreased then the colour of the solution changes to pink. Phenol red solution is orange in nature at neutral conditions.

Hence , option 3 is the correct answer.

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