100 g sample of clay (containing 19% H 2 O, 40% silica, and inert impurities as rest) is partially dried so as to contain 10% H 2 O
Which of the following is/are correct statements (s)
Text Solution
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(a,b,c,d)
Silica H 2 O Impurities
% in original clay ⇒ 40 19 100 – (40 + 19) = 41
% after partial drying ⇒ a 10 100 – (a + 10) = 90 – a
On heating, only water evaporates from clay, whereas silica and impurities are left as it is. Therefore, % ratio of silica and impurities remains unchanged, i.e.
= 
, ∴ a = 44.4%
% of mipurities after partial drying = (90 – a) = (90 – 44.4) = 45.6%
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