Consider (1) Zn(OH)2 (2) Cr(OH)3 (3) Mg(OH)2 (4) Al(OH)3 which hydroxide is precipitated by NH4OH containing NH4Cl- (a) 1,2 (b) 2,4 (c) Only 4 (4) 1,2,3&4

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(1)

Z n (O H)_{2}

(2)

C r (O H)_{3}

(3)

M g (O H)_{2}

(4)

A l (O H)_{3}

N H_{4} O H

N H_{4} C l

0.05 {mol L}^{- 1}

N H_{4} O H

0.25 {mol L}^{- 1}

N H_{4} C l

K_{s p} A l (O H)_{3} = 6 \times 10^{- 32}

K_{b} N H_{4} O H = 1.8 \times 10^{- 5}

K_{s p} M g (O H)_{2} = 6 \times 10^{- 10}

N H_{4} C l

N H_{4} O H

M g (O H)_{2}

K_{s p}

M g (O H)_{2}

Let A = {1, 2, 3}. Then number of equivalence relations containing (1, 2) is

(A) 1 (B) 2 (C) 3 (D) 4

Let A ={1,2,3}.Then, number of equivalence relations containing (1,2) is
(a)1
(b)2
(c)3
(d)4

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