1) Safety goggles must be worn in the lab when b) working with bases a) Working
ID: 1034574 • Letter: 1
Question
1) Safety goggles must be worn in the lab when b) working with bases a) Working with acids b) working with toxic chemicals d) always 2) If you take extra reagent (more than needed for the experiment), you should a) Return it to the container b) Dispose in the sink with a lot of water c) Dispose in the hazardous waste container in the fume cabinet d) All of these are allowed 3) The concentration of Ni in the Nickel ammonia complex was determined by a) Acid base titration b) U.V-Visible spectroscopy c) pH measurement d) Subtracting the percentage of NHs from 100 4) The procedure for making Ni (NH3InC12 complex is done at 60°C. If the reaction is done at 100°C, the yield of the Ni complex would be a) More that the expected yield at 60°C because NiCk can dissolve better at 100°C b) More than the expected yield at 60°C because the product precipitates out better at 100°C c) Less than the expected yield at 60°C because ammonia has low solubility at 100°c d) Same at both temperatures. 5) The curve below is A) Freezing point curve of a pure solvent with FP 80°C B) Freezing point curve of a solution with FP 80°C C) Freezing point curve of a pure solvent with FP 77°C D) Freezing point curve of a solution with FP 77°C 85 80 70 65 2 345791O11 12 13 14 16 18 171 TimelminExplanation / Answer
1. The right answer is option D. Always
Safety glasses should be worn when working in chemical laboratories always when working with any chemical solution whether it is acid or base or toxic chemicals.
Safety glasses prevent contact of the chemicals with our eyes thereby avoiding severe and permanent eye damage. Eyes are very delicate and important organ of our body hence they should be always protected when working with chemicals.
Moreover acid and base solutions are both corrosive and toxic and can cause severe damged to the eye when in contact.
So righg answer is option D. Always
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