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Air sample from an industrial town, heav...

Air sample from an industrial town, heavily polluted by `CO_(2)` was collected and analyzed . In one anaylsis , 56L of air measured at 1 atm and 273 K was passed through a 250 mL of 0.025 M NaOH solution , where `CO_(2)(g)` was absorbed completely . 25 mL of the above solution was then treated with excess of `BaCl_(2)` solution where all the carbonate was precipitated as `BaCo_(3)(s)` . The solution was filtered off and the filtrate required 25 mL of a 0.005 MHCl solution for neutralization.
Weight (in milligrams ) of precipitate `BaCO_(3)(s)` obtained from the 25 ml of test solution was:
[Atomic weight :Ba =137, C=12, O=16]

A

27.58

B

275.8

C

492.5

D

49.25

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The correct Answer is:
D
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Air sample from an industrial area of Delhi, which is heavily polluted by CO_(2) , was collected and analysed. One such sample of 224 L of air measured at STP was passed through a 500 " mL of " 0.1 M KOH solution, where CO_(2)(g) was absorbed completely. 50 " mL of " the above solution was then treated with excess of BaCl_(2) solution where all the carbonate was precipitated as BaCO_(4)(s) . The solution was filtered off and the filtrate required 30 " mL of " 0.1 M HCl solution for neutralisation. Q. ppm strength of CO_(2)(g) volume by volume (" mL of " CO_(2) per 10^(6) L of air) is

Knowledge Check

  • Air sample from an industrial town, heavily polluted by CO_(2) was collected and analyzed . In one anaylsis , 56L of air measured at 1 atm and 273 K was passed through a 250 mL of 0.025 M NaOH solution , where CO_(2)(g) was absorbed completely . 25 mL of the above solution was then treated with excess of BaCl_(2) solution where all the carbonate was precipitated as BaCo_(3)(s) . The solution was filtered off and the filtrate required 25 mL of a 0.005 MHCl solution for neutralization. Fraction of original NaOH (by mole) that reached with CO_(2) was:

    A
    0.2
    B
    0.4
    C
    0.6
    D
    0.8

  • Air sample from an industrial town, heavily polluted by CO_(2) was collected and analyzed . In one anaylsis , 56L of air measured at 1 atm and 273 K was passed through a 250 mL of 0.025 M NaOH solution , where CO_(2)(g) was absorbed completely . 25 mL of the above solution was then treated with excess of BaCl_(2) solution where all the carbonate was precipitated as BaCo_(3)(s) . The solution was filtered off and the filtrate required 25 mL of a 0.005 MHCl solution for neutralization. ppm strenght of CO_(2)(g) , volume by volume i.e. , mL of CO_(2) per 10^(6) mL of air was :

    A
    560
    B
    5600
    C
    100
    D
    1000

  • Air sample from an industrial area of Delhi, which is heavily polluted by CO_(2) , was collected and analysed. One such sample of 224 L of air measured at STP was passed through a 500 " mL of " 0.1 M KOH solution, where CO_(2)(g) was absorbed completely. 50 " mL of " the above solution was then treated with excess of BaCl_(2) solution where all the carbonate was precipitated as BaCO_(4)(s) . The solution was filtered off and the filtrate required 30 " mL of " 0.1 M HCl solution for neutralisation. Q. Calculate the weight of the precipitate of BaCO_(3)(s) obtained from 50 " mL of " the above test solution. (Ba=137,C=12,O=16,Mw(BaCO_(3))=137+12+3xx16=197gmol^(-1))

    A
    3.94 g
    B
    0.394 g
    C
    1.97 g
    D
    0.197 g

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