लघु उत्तर लिखिए- (क) दोनों मित्रों ने क्या प्रतिज्ञा की थी? प्रतिज्ञा को कौन टालता रहता था और कौन अधिक उत्सुक था? TITIT 2
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:उसका दोस्त जल्दी से ठीक हो जाए
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During a process, the zeolite bed was exhausted after 10.5 hours and 425 litres of 0.6 N sodium chloride solution was required to restart the function of the zeolite process. Work out the hardness of hard water in ppm.
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