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10 46·The weak base(s) in the following list is (are) (II) I (TV) HyCOs(aq) + H2O(l)-? H,0. (aq) + HCOs (aq CH COOH Ho)Ho (aq) CH,COO-(aq) NaOH(aq) + CH3NH2 (aq) HsO(1) -Na.(aq) OH (aq) + () A) Only IV 47. Which of the following is the Arhenius Theory of acids and bases? (A) + H2O(I)- + CHIH(aq) ?? (aq) + (B) Only V (C) IV & V DI.n&V An acid dissociates in water to form hydrogen ions (H) and a base dissociates in water to produce hydroxide ions (OH) An acid is a proton donor and a base is a proton acceptor. Acids are substances with a very high pH (greater than 10) and bases are substances with (B) (C) a very low pH (less than 3) . (D) None of the above. 48. The following numbers represent a list of pH values. In which of these sets are the pH values arranged from the most acidic to the most basic? (A) 2, 5, 7, 9, 10, 11 (C) 14, 10, 7, 1, 3, 5 (B) 14, 10, 7, 4, 3, 1 (D) 1, 3, 6, 8, 11, 14 49. How many milliliters of 0.400 M NaOH are required to completely neutralize 20.00 mL of 0.200 M HC1? (A) 50.0 mL (B40.0 mL (C) 20.0 mL (D) 10.0 mL 50 Which equation(s) in the following list represent(s) a double -replacement reaction? (I) HNO, (aq) + KOH (aq)--+ KNO, (aq) + H2O (aq) (11) 2 Al(OH)-? AlsO3 s) + 3H,0 (a) (III) Zn (s) + 2HCl (aq)-? ZnCl; (aq) + H2 (g) (IV) 2Mg (s) + 0 (g)2MgO (s) (C) III (D) IV
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46. Option D, since acids are weak bases and amine is less basic than naoh.

47. Option A

48. OPTION D, since pH <7-acidic and,, >7 more basic

49. Option D since MaVa =MbVb

Vb =MaVa/Mb

=0.2x20/0.4

=10 mL

50.Option A, reaction I

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