Question

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Answer 1

$\huge\underline\mathtt\colorbox{cyan}{B. 100 ml of water}$

10 gm salt in 100 ml water- let its concentration be x

We want 2x(A. T. Q)

For decreasing concentration, we need higher solvent(water here)

x= 100ml

2x=2(100)ml

We already had 100 ml

So 200-100=100

100ml is correct