PARTS PER MILLION

Which of the following statement is not incorrect ? (a) In the 1990s, Delhi ranked fourth among the 40 most polluted cities of the world. (b) All the buses of Delhi were converted to run on CNG by the end of 2000. (c) Euro III norms , for example , stipulate that sulphur be controlled at 350 parts-per- million (ppm) in diesel and 150 ppm in petrol. (d) Mass Emission Standards (Bharat Stage II which is equivalent to Euro - II norms) are applicable in all cities of India.

A 100 mL sample of water was treated to convert any iron present to Fe^(2+) . Addition of 25mL of 0.002M K_(2)Cr_(2)O_(7) resulted in the reaction. 6Fe^(2+)+Cr_(2)O_(7)^(2-)+14H^(+) to 6Fe^(3+)+2Cr^(3+)+7H_(2)O The excess K_(2)Cr_(2)O_(7) was back- titrated with 7.5mL of .01M Fe^(2+) solution. Calculate the parts per million (ppm) of iron in the water sample.

Which one of the following States of India has a million city as per 2001 Census report?

10 L of hard water required 0.56 g of lime (CaO) for removing hardness. Hence, temporary hardness in ppm (part per million 10^(6) ) of CaCO_(3) is:

10L of hard water required 0.56g of time (CaO) for removing hardness. Hence, temporary hardness in p p m (part per million, 10^6 ) of CaCO_3 is