Explore topic-wise MCQs in Hazardous Waste Management.

This section includes 31 Mcqs, each offering curated multiple-choice questions to sharpen your Hazardous Waste Management knowledge and support exam preparation. Choose a topic below to get started.

1.

The environmental issue caused by chemical precipitation is _________

A. Chemical silt
B. Salts
C. Liquid matter
D. Degradation
Answer» B. Salts
Discussion
2.

Chemical precipitation treatment is user economic.

A. True
B. False
Answer» C.
Discussion
3.

_______ is used for precipitation of heavy metals.

A. Calcium hydroxide
B. Lime
C. Potassium hydroxide
D. Lead oxide
Answer» C. Potassium hydroxide
Discussion
4.

Precipitation of metals varies depending on _________ level.

A. Acidic
B. Basic
C. Neutral
D. pH
Answer» E.
Discussion
5.

_______ treatment is suitable for metal salts bearing wastes.

A. Neutralisation
B. Chemical precipitation
C. Hydrolysis
D. Solvent extraction
Answer» C. Hydrolysis
Discussion
6.

Chemical precipitation treatment is effective in wastewater containing _______

A. Chemicals
B. Chloride
C. Toxic metals
D. Impurities
Answer» D. Impurities
Discussion
7.

Chemical precipitation is used in conjunction with neutralisation.

A. True
B. False
Answer» B. False
Discussion
8.

Precipitation by ___________ is widely used method for treating hazardous waste.

A. Calcium hydroxide
B. Sodium hydroxide
C. Potassium hydroxide
D. Lead oxide
Answer» B. Sodium hydroxide
Discussion
9.

Chemical precipitation makes the hazardous waste _________

A. Soluble
B. Insoluble
C. Volatile
D. Acidic
Answer» C. Volatile
Discussion
10.

If the nucleation rate is Bo=2*108nuclei/Ls and the induction time T= 12 seconds, what is the number of crystals per unit volume of mother liquor?

A. 23*108
B. 6*109
C. 56*109
D. 24*108
Answer» E.
Discussion
11.

If the nucleation rate is Bo=6.67*108nuclei/Ls and the induction time T= 30 seconds, what is the number of crystals per unit volume of mother liquor?

A. 6*108
B. 6*109
C. 6*1010
D. 6.67*109
Answer» D. 6.67*109
Discussion
12.

If the nucleation rate is Bo=2*108nuclei/Ls and the induction time T= 45 seconds, what is the number of crystals per unit volume of mother liquor?

A. 8*108
B. 8*109
C. 9*109
D. 9*108
Answer» D. 9*108
Discussion
13.

If the nucleation rate is Bo=2*108nuclei/Ls and the induction time T= 40 seconds, what is the number of crystals per unit volume of mother liquor?

A. 8*108
B. 8*109
C. 9*109
D. 9*108
Answer» C. 9*109
Discussion
14.

If the nucleation rate is Bo=2*108nuclei/Ls and the induction time T= 75seconds, what is the number of crystals per unit volume of mother liquor?

A. 6*108
B. 6*109
C. 1.5*109
D. 1.5*108
Answer» D. 1.5*108
Discussion
15.

If the nucleation rate is Bo=2*108nuclei/Ls and the induction time T= 3seconds, what is the number of crystals per unit volume of mother liquor?

A. 6*108
B. 6*109
C. 1.5*109
D. 1.5*108
Answer» B. 6*109
Discussion
16.

If the nucleation rate is Bo=2*108nuclei/Ls and the induction time T= 30 seconds, what is the number of crystals per unit volume of mother liquor?

A. 6*108
B. 6*109
C. 1.5*109
D. 1.5*108
Answer» C. 1.5*109
Discussion
17.

Precipitation is opposite of what separation technique?

A. Distillation
B. Solution crystallization
C. Melt crystallization
D. Zone melting
Answer» C. Melt crystallization
Discussion
18.

IF_THE_NUCLEATION_RATE_IS_BO=6.67*108NUCLEI/LS_AND_THE_INDUCTION_TIME_T=_30_SECONDS,_WHAT_IS_THE_NUMBER_OF_CRYSTALS_PER_UNIT_VOLUME_OF_MOTHER_LIQUOR??$

A. 6*10<sup>8</sup>
B. 6*10<sup>9</sup>
C. 6*10<sup>10</sup>
D. 6.67*10<sup>9</sup>
Answer» D. 6.67*10<sup>9</sup>
Discussion
19.

THE_ENVIRONMENTAL_ISSUE_CAUSED_BY_CHEMICAL_PRECIPITATION_IS______?$

A. Chemical silt
B. Salts
C. Liquid matter
D. Degradation
Answer» B. Salts
Discussion
20.

If_the_nucleation_rate_is_Bo=2*108nuclei/Ls_and_the_induction_time_T=_12_seconds,_what_is_the_number_of_crystals_per_unit_volume_of_mother_liquor?$

A. 23*10<sup>8</sup>
B. 6*10<sup>9</sup>
C. 56*10<sup>9</sup>
D. 24*10<sup>8</sup>
Answer» E.
Discussion
21.

Chemical precipitation treatment is user economic. True or False?

A. True
B. False
Answer» C.
Discussion
22.

_____ is used for precipitation of heavy metals

A. Calcium hydroxide
B. Lime
C. Potassium hydroxide
D. Lead oxide
Answer» C. Potassium hydroxide
Discussion
23.

Precipitation of metals varies depending on ___ level

A. Acidic
B. Basic
C. Neutral
D. pH
Answer» E.
Discussion
24.

______treatment is suitable for metal salts bearing wastes.

A. Neutralisation
B. Chemical precipitation
C. Hydrolysis
D. Solvent extraction
Answer» C. Hydrolysis
Discussion
25.

If the nucleation rate is Bo=2*108nuclei/Ls and the induction time T= 30 seconds, what is the number of crystals per unit volume of mother liquor?

A. 6*10<sup>8</sup>
B. 6*10<sup>9</sup>
C. 1.5*10<sup>9</sup>
D. 1.5*10<sup>8</sup>
Answer» C. 1.5*10<sup>9</sup>
Discussion
26.

Chemical precipitation treatment is effective in wastewater containing _____

A. Chemicals
B. Chloride
C. Toxic metals
D. Impurities
Answer» D. Impurities
Discussion
27.

Why does the resulting shapes maybe far away from what corresponds to minimum gibbs free energy?

A. Because they come out of a solution
B. Because they might contain moisture
C. Because they are formed at considerable super saturation
D. Because they contain impurities from solution
Answer» D. Because they contain impurities from solution
Discussion
28.

Chemical precipitation is used in conjunction with neutralisation. True or False.

A. True
B. False
Answer» B. False
Discussion
29.

Precipitation is applicable for what types of solutes?

A. Insoluble
B. Soluble
C. Sparingly soluble
D. Both insoluble and soluble
Answer» D. Both insoluble and soluble
Discussion
30.

Precipitation by ____ is widely used method for treating hazardous waste.

A. Calcium hydroxide
B. Sodium hydroxide
C. Potassium hydroxide
D. Lead oxide
Answer» B. Sodium hydroxide
Discussion
31.

Chemical precipitation makes the hazardous waste _____

A. Soluble
B. Insoluble
C. Volatile
D. Acidic
Answer» C. Volatile
Discussion