J Ha F D F F F 65. Platinum nanoparticles are a catalyst in an automobile cataly
ID: 928855 • Letter: J
Question
J Ha F D F F F 65. Platinum nanoparticles are a catalyst in an automobile catalytic converter. Why are nanoparticles used? (A) They increase the activation energy. (B) They maximize the reactive surface area. (C) They increase the temperature of the catalyst. (D) They shift equilibrium towards the products. Which reaction is not an oxidation-reduction reaction? (A) Zn(s) + 2HCl(aq) H2(g) + ZnCl2(aq) (B) CH4(g) + 202(g) CO2(g) + 2H2O(g) (C) 2HCl(aq) + Ca(OH)2(s) 2H2O(l) + CaCl2(aq) (D) 2Cr3O72-(aq) +3CH3CH20H(aq)+ 16H+(aq) 66. 4Cr (aq)+3CH,COOH(aq)+ 11H200) Which reported measurement is correct when using a 10-mL graduated cylinder with 0.1 mL markings? 67. 10-mL graduated cylinder with 0.1 mL, markings? (A) 1.15 mL (C) 1.5 mL (B) 5.125 mL (D) 10.15 mLExplanation / Answer
65. (B) They maximize the reactive surface area.
66. (C) the reaction is neutralisation reaction, where there is no change in the oxidation states of atoms.
67. (C) Because the minimum measuring capacity is 0.1 mL only
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