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3M. The Which statement is correct for this reaction (A) CH,acts as a base. (C) NH, acts as a base 25. In which set are both compounds soluble in water? 29. (A) magnesium chioride (MgCl) and octane (C.H (B) ethanol (CH,CHJOH) and propane (CH,CH/CH 10s ) carbon tetrachloride (CCL) chloride (MgCl)and magnesium chlorideB) CH, is the conjugate acid of CH. D) magnesium chloride (MgCl) and ethano! (D) NH, is the conjugase acid of NH, (CH,CH OH) 30, which is a conjugate acid-base pair in the reaction? 26. When potassium chloride, KCI, dissolves in waler. which of these disgrams would best represent what you would expect to find in solution? (A) NJ, and H,0 (C) N,H, and N,H, (B) NH,' and OH (D) N,H, and OH (CI 31. The pH of four different solutions was determined and 4, w were added tat l volumes of each pH after adding H (A Solution initial pH first addition second 5.2 5.4 6.2 50 1.8 18 m these measurements, we can conclude that before any acid was added solutions 1 and 3 are buffers but solution 3 has a greater buffer capacity than 1. solutions 2 and 4 are buffers but solutioe 2 has a greater buffer capacity than 4.. solutions 3 and 4 are buffers but solution 4 has a greater buffer capacity than 3 none of the four initial solutions is a buffer (A) (B) (C) (D) 27. Which is a precipitation reaction? 32. Equal volumes of solutions of acids and their sodium salts are mixed to prepare a buffer. The solution with closest to 50 was prepared by mixing (A) 1.0 x 10* M hydrochloric acid and 0.1 M NaCI (B) 0.10 M benzoic acid (K,-63 x10") and 0.10 M (C) 0.10 M butyric acid (K,-1.5 x 10") and 0.10 M (D) 0.10 M formic acid (K, -4.3 x 10 sodium benzoate sodium butyrate What is the net ionic equation for the reaction of aqueous solutions of Pb(NO,), and KCI? 28. and 0.10 M sodium formate Page 6 Illegal to photocopy or post on the interact

Answer 1

25. Ans:- Option .D MgCl₂ and CH₃CH₂OH are soluble in water .

Explanation :- All ionic compounds and polar covalent molecules are generally soluble in water (polar solvent) whereas all non-polar covalent molecules are insoluble in water (polar solvent) i.e "like dissolve like" .

CH₃CH₂OH (i.e ethanol ) is soluble in water due to intermolecular hydrogen bonding between ethanol and water molecules. on the other hand MgCl₂ is a ionic compound therefore it is soluble in water .

Octane (i.e C₈H₁₈), Propane (i.e CH₃CH₂CH₃) and carbon tetrachloride (i.e CCl₄) are non-polar molecules , therefore these all are insoluble in water (polar solvent) .

Therefore option D is the correct answer .