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Statement-I: Calgon forms soluble complex with cations causing hardness of water.
Statement-II: Hydrogen is a better fuel than petrol.

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Both statements I and II are correct

Statement-I is correct and statement-II is incorrect

Statement-I is incorrect and statement-II is correct

Both statements I and II are incorrect

answer is A.

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Detailed Solution

I) ${Na}_{2} [{Na}_{4} {({PO}_{3})}_{6}] + M^{+ 2} \to {Na}_{2} [{MNa}_{2} {({PO}_{3})}_{6}] + 2 {Na}^{+}; soluble$

II) Calorific value of hydrogen is 143 kJ/gram where as petrol is 48.7 kJ/gram.

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