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13. The adjoining diagram shows three soap bubbles

A, B and C prepared by blowing the capillary tube fitted with stop cocks, S1, S2 and S3. With stop cock S closed and stop cocks S1, S2  and S3 opened

(a)   B will start collapsing with volumes of A and C increasing

(b)  C will start collapsing with volumes of A and B increasing

(c)   C and A both will start collapsing with the volume of B increasing

(d)  Volumes of A, B and C will become equal at equilibrium

Ans. c

(8)

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