A U- tube of uniform cross-section shown in figure is partially filled with liquid I. Another liquid II which does not mix with I is poured into one side. The liquid levels of two sides is found the same, while the level of liquid I has rising by 2 cm. If the specific gravity of liquid I is 1.1, the specific gravity of liquid must be-
1.2
1.1
1.3
1.0
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