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Question

# A 100 ml of 1 M NaCl solution, 100 ml of 2 M MgCl2 solution and 300 ml of 4 M Mg(NO3)2 solution are mixed and is diluted to 2. Which of the following is the correct regarding final concentration?

A
[Na+]=0.2 M
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B
[Mg2+]=0.7 M
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C
[Cl]=0.2 M
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D
[NO3]=1.2 M
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Solution

## The correct options are B [Mg2+]=0.7 M D [NO−3]=1.2 MMoles of NaCl = 1×1001000 ⇒ 0.1 moleNaCl→Na++Cl− 0.1 0.1Moles of MgCl2 = 2×1001000 ⇒ 0.2 moleMgCl2→Mg+2+2Cl− 0.2 0.4Moles of Mg(NO3)2 = 4×3001000 ​ ⇒ 1.2 moleMg(NO3)2→Mg2++2NO−3 1.2 2.4A) [Na+]=nV=0.12=0.05MB) [Mg2+]=nV=0.2+1.22=0.7MC) [Cl−]=nV=0.1+0.42=0.25MD) [NO−3]=nV=2.42=1.2MHence , option (B) and (D) are correct .

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