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Q.

A quantity of 80g of a salt (XY) of strong acid and weak base is dissolved in water to form 2 lit. aqueous solution. At 298 K, the pH of the solution is found to be 5. If ‘XY’ forms CsCl type crystal and the radius of $X^{+} & Y^{-}$ ions are 160 pm and 186.4 pm respectively. Which of the following is/are correct ? $[{(K_{b})}_{X O H} = 4 \times 10^{- 5}; N_{A} = 6 \times 10^{23}; \sqrt{3} = 1.732]$

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a

Degree of hydrolysis of salt is $2.5 \times 10^{- 5}$

b

Molar mass of the salt is 100g/mol.

c

density of solid XY is 2.6 $g / c m^{3}$

d

Unit cell edge length of XY crystal is 400 pm

answer is A, B, C, D.

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A quantity of 80g of a salt (XY) of strong acid and weak base is dissolved in water to form 2 lit. aqueous solution. At 298 K, the pH of the solution is found to be 5. If ‘XY’ forms CsCl type crystal and the radius of X+ & Y− ions are 160 pm and 186.4 pm respectively. Which of the following is/are correct ? [(Kb)XOH=4×10−5; NA=6×1023; 3=1.732]