REDOX REACTION | PART 1| QUESTIONS FROM 68 TO 71 | NARENDRA AVASTHI SIR"S SOLUTIONS |HARDNESSOFWATER
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Загружено: 2026-03-16
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✔️ Subject: Chemistry
✔️ Topic Name: REDOX REACTIONS
NARENDRA AVASTHI SIR .PHYSICAL CHEMISTRY
196. A sam ple of pure so dium car bon ate 0.318 g is dis solved in wa ter and ti trated with HCl
so lu tion. A vol ume of 60 mL is re quired to reach the methyl or ange end point. Cal cu late the
molarity of the acid.
(a) 0.1 M
(b) 0.2 M
(c) 0.4 M
(d) None of these
197. 10 L of hard wa ter re quired 5.6 g of lime for re mov ing hard ness. Hence tem po rary hardness in
ppm of CaCO3 is:
(a) 1000
(b) 2000
(c) 100
(d) 1
198. 1 L of pond water contains 20 mg of Ca2 and 12 mg of Mg2+ ions. What is the volume of a 2 N
Na CO
2
3 solution required to soften 5000 L of pond water?
(a) 500 L
(b) 50 L
(c) 5 L
(d) None of these
199. One litre of a sample of hard water contain 4.44 mg CaCl2 and 1.9 mg of MgCl .
2 What is the
total hardness in terms of ppm of CaCO3?
(a) 2 ppm
(c) 4 ppm
(b) 3 ppm
(d) 6 ppm
200. If hardness of water sample is 200 ppm, then select the incorrect statement :
(a) Mass ratio of CaCO3 to H O
2 is
(b) Mole ratio of CaCO3 to H O
.
002
100
2 is 3 6 10 5
.
(c) Mass of CaCO3 present in hard water is 0.2 g/L
(d) 1 miliequivalent of CaCO3 present in 1 kg of hard water
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Topic Wise Explanation
Chapter Wise MCQs
Previous year question paper
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