The endpoint in the Titration of Antacids experiment was A. red to yellow B. col

Question

The endpoint in the Titration of Antacids experiment was A. red to yellow B. colorless to pink C. yellow to red D. orange to green The electron pair geometry bond angle in PF_2 are A. tetrahedral, 109.5 degree B. tetrahedral, less than 109.5 degree c. tetrahedral, greater than 109.5 degree D. trigonal, bipyramidal, 120 degree E. octahedral, 90 degree Why must you wear safety goggles during the gravimetric analysis of sulfate experiment? A. The sulfuric acid used is dangerous to the eyes and night cause B. Goggle wearing in chemistry labs is by the state of C. Goggles must be worn whenever exposure to caustic or hazardous chemicals is involved D. All of the above

Explanation / Answer

11. ANS: B, At the end point of the titration of antacids , the phenolphthalein turns into PINK from COLORLESS

12. ANS:
The question is not appearing clear: If it PF3 then the answer would be trigonal pyramidal and the bond angle will be 96.3deg, so the most suitable option will be (B) in that case i.e. tetrahedral and less than 108.5deg
But if that is PF5 then the answer will be Trigonal Pyramidal, 120deg which is (D) in this case

13. (D) All the given options are correct, As using goggles is for ensuring saftey in each small step which we do in chemistry lab

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