GATE CE 2021 Paper 2 — page 9

Questions 25–27 of 65. Imported answers require review unless explicitly marked reviewed.

The hardness of a water sample is measured directly by titration with 0.01 M solution of ethylenediamine tetraacetic acid (EDTA) using eriochrome black T (EBT) as an indicator. The EBT reacts and forms complexes with divalent metal cations present in the water. During titration, the EDTA replaces the EBT in the complex. When the replacement of EBT is complete at the end point of the titration, the colour of the solution changes from

Your answerChoose one option.

blue-green to reddish brown

blue to colourless

reddish brown to pinkish yellow

wine red to blue

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The softening point of bitumen has the same unit as that of

Your answerChoose one option.

distance

temperature

time

viscosity

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Which of the following statement(s) is/are correct?

Your answerSelect all correct options. You can choose more than one.

Increased levels of carbon monoxide in the indoor environment result in the formation of carboxyhemoglobin and the long term exposure becomes a cause of cardiovascular diseases.

Volatile organic compounds act as one of the precursors to the formation of photochemical smog in the presence of sunlight.

Long term exposure to the increased level of photochemical smog becomes a cause of chest constriction and irritation of the mucus membrane.

Increased levels of volatile organic compounds in the indoor environment will result in the formation of photochemical smog which is a cause of cardiovascular diseases.

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2021 · Paper 2

Question 15

Question 16

Question 17