Chapter 16: Lab Safety and Practical Skills
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Q.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?
Acid-Base Titration
Q.2
Why phenolphthalein indicator is more appropriate to use during the titrations which involve a strong acid and a strong base?
Basic Radicals
Q.3
Which cation gives a white gelatinous the addition precipitate upon aqueous ammonia!
Q.4
Addition of NH4OH to an aqueous solution of cation gives a green precipitate which turns brown upon Which basic radical is standing. indicated?
Q.5
On dry heating test for salt analysis, the evolution of colorless, odourless gas that turns limewater milky suggests the presence of:
Q.6
The chromyl chloride test is a specific confirmatory test for:
Q.7
The brown ring test is a confirmatory test for which acid radical?
Q.8
Which of the following is not a component of titration?
Q.9
Which of the following is the most suitable indicator for the titration of a strong acid and a strong base?
Q.10
Why is it important to use a pipette in titration?
Q.11
A white precipitate that dissolves in excess ammonia is likely to be:
Q.12
Which of the following is a primary standard solution?
Q.13
Which apparatus is used to deliver a variable volume of solution in titration?
Q.14 The end point of a titration is indicated by:
Q.15
What is the typical volume of solution a pipette delivers in titration?
Q.16
Before starting a titration, the burette should be:
Q.17
Which of the following pairs would require methyl orange as an indicator?
Q.18
A gas with a pungent smell turns moist red litmus paper blue. The gas is likely:
Q.19
Which precipitate with NaOH that dissolves in excess NaOH?
Q.20
A salt solution gives a brick-red flame test. The cation present is likely:
Q.21
The addition of Hcl to a carbonate salt leads to:
Q.22
Which reagent is used to test for chloride ions?
Q.23
In case of a chemical spill on the skin, the first step is to:
Q.24
Which is the proper way to smell a chemical?
Q.25 Lab coats are important because they:
Q.26
A student forgets to label a beaker with an unknown liquid. What should they do?