Related Questions

Bromine content in sea water may be around __________ ppm.
A 70
B 640
C 1875
D 2500
Bromides contained in hot mother liquor is treated with __________ during manufacture of bromine from sea water.
A SO3
B Cl2
C NH3
D SO2
শাকিলের প্রস্তুতকৃত দ্রবণের i. ppm একক হবে 40000 ppm ii. মধ্যে আরো 10 mL পানিযোগে সেমিমোেলারে পরিণত হবে iii. মধ্যে 6.02 × 1022 টি NaOH অণু রয়েছে নিচের কোনটি সঠিক?
A i ও ii
B i ও iii
C ii ও iii
D i, ii ও iii
Bromine is used in the preparation of
A Fire extinguishing compounds
B Fire proofing agents
C Dyes and antiknock compounds
D All of the above
Solution X contains 40% salt and 60% water by weights, Solution Y contains 25% salt and 75% water. If a mixture of X and Y contains 30% salt. What percent of the weight of this mixture is solution X?
A 10%
B 33.3%
C 40%
D 42.5%
TLV of lead for public sewer/waste water is about __________ ppm.
A 1
B 25
C 150
D 650
Dissolved oxygen content in river water is around __________ ppm.
A 5
B 100
C 250
D 500
The permissible color for domestic water supply is __________ ppm.
A 1
B 20
C 100
D 1000
Normal dosage of chlorine in public water supply scheme ranges from __________ ppm.
A 0.5 to 1
B 10 to 15
C 300 to 500
D 1000 to 1500
In order to protect the aquatic creatures, the dissolved oxygen content in fresh water stream should never be less than __________ PPm.
A 0.5
B 1
C 5
D 20

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