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Q.

A sample of clay contains 50% silica and 10% water. The sample is partially dried by which it loses 8 gm water. If the percentage of silica in the partially dried clay is 52, what is the percentage of water in the partially dried clay?

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a

2.4%

b

2.0 %

c

6.4%

d

10.4%

answer is B.

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Detailed Solution

$50 % {SiO}_{2}, 10 % H_{2} O, 40 %$ others

$\begin{array}{l} 50 \to 52 \\ \Rightarrow 40 \to \frac{52}{50} \times 40 = 41.6 \end{array}$

${SiO}_{2} +$ others $= 93.6$

$∴ H_{2} O$ present $= 100 - 93.6$

$= 6.4 %$

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A sample of clay contains 50% silica and 10% water. The sample is partially dried by which it loses 8 gm water. If the percentage of silica in the partially dried clay is 52, what is the percentage of water in the partially dried clay?