Question

80. From the complete decomposition of 20 g Caco, at
STP the volume of Co, obtained is
(a) 2.24 L
(b) 4.48
(c) 44.8L
(d) 48.4L
81. 5g of CH.COOH is dissolved in one litre of ethanol.
Suppose there is no reaction between them. If the
density of ethanol is 0.789 g/mL then the molality of
resulting solution is
(a) 0.0256
(b) 0.1056
(c) 1.1288
(d) 0.2076
87. 800 g of a 40% solution by weight was cooled. 100 g
of solute precipitated. The percentage composition of
remaining solution is
(a) 31.4%
(b) 57.6%
(c) 45.8%
d) 41.4%

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Answer 1

Answer:

80. a 81. d 87. b

Explanation:

MATH :)