More concentrated solution among the following is- a)1%H3PO4 b)1 m H3PO4 C)1 M H3PO4 d)1 N H3PO4

Molar mass of H3PO4 = 98 gmol-1
1% solution by weight = ​1 g H3PO4 in 99 g of water
Molarity = 1/98*.100 = 0.102 M 

1m H3PO4 ​= 98 g in 1000 g of water

1M = 98 g in 1000 ml solution 

1N = 98/3 g in 1000 ml of water = 32.6 g in 1000 ml solution

1M solution will be more concentrated as it has 98 g in 1000 ml solution whereas 1 molal has 98 g in 1000 g of water. In molar solutions the actual weight of water will be lesser than the molal solutions. Hence molar solutions are more concentrated than molal solutions.

Answer is C.

 

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