NABL QUIZ 6, HOOGHLY

To eradicate sulphide/sulphite/thiosulphate from water sample in testing ‘Chloride’, add 1 ml ________

Please Type answer

To test ‘Total Hardness’, the pH value should be maintained in Ammonia Buffer Solution is

• 10

• 7.9

• 9.6

• 8

EDTA and it’s sodium salts form a chelated soluble complex when added to a solution of certain metal cations

• True

• False

What is the chemical formula of EDTA?

• C₁₂H₁₆N₂O₈

• C₁₀H₁₆N₂O₈

• C₁₄H₁₆N₂O₆

• C₁₀H₁₈N₂O₈

Although

Laboratory Assistant know the process of determination of colour, the same is

not mentioned under the resposibility of the Laboratory Assistant. Now if the

Laboratory Chemist, who is mainly responsible for the said analysis is absent

in the lab and a urgent sample is submitted for testing, can the laboratory

assistant test the same and report?

• Yes

• No

What is the primary standard used for determination of Total Hardness using EDTA as secondary standard?

“Specific Criteria for Accreditation of Calibration

Laboratories” can be accessed by referring to____

Please Type Answer

NABL 500 is “Directory of Accredited Calibration Laboratories”

• True

• False

Calibration Certificates are issued by a Third Party Calibration Agency after receiving 50% of the payment

• True

• False

Any mathematical adjustment made to a calculation to account for deviations in either the sample or the method of measurement is called