Q.

58.5g of NaCl and 180g of glucose were separately dissolved in 1000 mL of water. Identify the correct statement regarding the elevation of boiling point (b.pt.) of the resulting solutions 

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a

Both the solutions will show equal elevation of b.pt

b

The b.pt. of elevation will be shown by neither of the solutions 

c

Glucose solution will show higher elevation of b.pt

d

NaCl solution will show higher elevation of b.pt

answer is A.

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Detailed Solution

ΔTb=iKbm

For water 1000mL=1000g

Molality of NaCl=wt.(solute)/MW( solvent )×1000

                          =58.5/58.51000×1000=1m

Molality of glucose =180/1801000×1000=1m

For NaCl, i=2 and 

For glucose, i=1

ΔTb for NaCl>ΔTb for glucose 

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