StudentAidUnit 16: Lab Safety and Practical Skills — Mcqs
11th Class Chemistry · Unit 16: Lab Safety and Practical Skills
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1.While taking a reading with a burette, why it is always advisable to read the lower meniscus for the colorless liquids and the upper meniscus for the coloured liquids?
- a Because it is more convenient
- b Because colorless liquids have more surface tension than colored liquids
- c Because lower meniscus does not exist for colored liquids
- d Because of the parallax effect
2.Why phenolphthalein indicator is more appropriate to use during the titrations which involve a strong acid and a strong base?
3.Which cation gives a white gelatinous precipitate upon the addition of aqueous ammonia?
- a Cr3+
- b Cr2+
- c Zn2+
- d Al3+
4.Addition of NH4OH to an aqueous solution of cation gives a green precipitate which turns brown upon standing. Which basic radical is indicated?
- a Cu2+
- b Cr3+
- c Fe2+
- d Fe3+
5.On dry heating test for salt analysis, the evolution of colorless, odourless gas that turns limewater milky suggests the presence of:
6.The chromyl chloride test is a specific confirmatory test for:
7.The brown ring test is a confirmatory test for which acid radical?
Acid-Base Titration
8.Which of the following is not a component of titration?
9.Which of the following is the most suitable indicator for the titration of a strong acid and a strong base?
10.Why is it important to use a pipette in titration?
11.A white precipitate that dissolves in excess ammonia is likely to be:
12.Which of the following is a primary standard solution?
13.Which apparatus is used to deliver a variable volume of solution in titration?
14.The end point of a titration is indicated by:
15.What is the typical volume of solution a pipette delivers in titration?
16.Before starting a titration, the burette should be:
Salt Analysis
17.Which of the following pairs would require methyl orange as an indicator?
18.A gas with a pungent smell turns moist red litmus paper blue. The gas is likely:
19.Which cation forms a white precipitate with NaOH that dissolves in excess NaOH?
20.A salt solution gives a brick-red flame test. The cation present is likely:
21.The addition of HCl to a carbonate salt leads to:
22.Which reagent is used to test for chloride ions?
Laboratory Safety and Procedures
23.In case of a chemical spill on the skin, the first step is to:
24.Which is the proper way to smell a chemical?
25.Lab coats are important because they:
26.A student forgets to label a beaker with an unknown liquid. What should they do?
27.Eating and drinking in the lab is: