
Water MID I model objective question
Authored by B. Safala
Chemistry
Used 11+ times

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20 questions
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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
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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