only 10g of X undissolved
only 16 g of Y undissolved
10 g of X and 16 g of Y undissolved
all X and Y dissolved
all X and Y undissolved
Correct answer is B
For salt X, from the graph, 80g of X dissolves by 349K, so by 353K, all 80g of X is dissolved totally in 100g of water. For salt Y, from the graph, 64g of Y dissolves by 353K, so (80-64)g of Y is left undissolved. This is 16g of Y left undissolved at that temperature.
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