Water MID I model objective question

Water MID I model objective question

20 Qs

quiz-placeholder

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Water MID I model objective question

Water MID I model objective question

Assessment

Quiz

Chemistry

Practice Problem

Medium

Created by

B. Safala

Used 11+ times

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20 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

     The disinfection action of bleaching powder is  due to                                           

                

A)   HOCl (hypochlorous acid )

B) HCl

C) Ca(OH)2

     D) CaCl2  

Answer explanation

The disinfection action of bleaching powder is primarily due to HOCl (hypochlorous acid), which is a strong oxidizing agent effective in killing bacteria and viruses, making option A the correct choice.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

  1. Cation exchange resin is regenerated by

                                     

A)                NaOH

B)        HCl

C)        NaCl

D) KOH

Answer explanation

Cation exchange resins are regenerated using acids. HCl (hydrochloric acid) effectively replaces the cations on the resin with H+ ions, making it the correct choice for regeneration.

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many binding sites are available on EDTA                                                

                              

A)   3

B)     4

C)  6

D) 5

Answer explanation

EDTA (ethylenediaminetetraacetic acid) has six binding sites that can chelate metal ions, making the correct answer C) 6. This property is crucial for its use in various chemical and biological applications.

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

   The permanent hardness of water is due to                                                                   

                       

  HCO3-

CO3

Cl-

Na+

Answer explanation

The permanent hardness of water is primarily caused by the presence of dissolved salts, particularly chlorides like Cl-. Unlike bicarbonates, which can be removed by boiling, chlorides remain in solution, contributing to permanent hardness.

5.

FILL IN THE BLANK QUESTION

1 min • 1 pt

                       functional groups are present in anion exchange resin membranes

Answer explanation

Anion exchange resin membranes contain functional groups that are typically acidic, allowing them to attract and exchange anions. Therefore, the correct answer is 'Acidic'.

6.

FILL IN THE BLANK QUESTION

1 min • 1 pt

The hardness of water is expressed in terms of _________________________

equivalence.

Answer explanation

The hardness of water is commonly expressed in terms of calcium carbonate (CaCO3) equivalence, which quantifies the concentration of hardness-causing minerals in water.

7.

FILL IN THE BLANK QUESTION

1 min • 1 pt

___________________ salt is responsible for caustic embrittlement.

Answer explanation

Na2CO3, or sodium carbonate, is known to cause caustic embrittlement in metals, particularly in high-temperature water systems. This occurs due to its ability to increase the pH and lead to stress corrosion cracking.

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