Question

5) For a particular chemical reaction it is found that the value for the equilibrium constant for the reaction decreases as temperature increases. Based on this we can conclude a) AH>0 b) AH® < 0 c) AS > 0 d) AS 0 e) AG < 0 6) When 0.0100 moles of dimethyl amine ((CH3)2NH) is added to 1.000 liters of water, the pH of the water increases above the value pH = 7.0 found for neutral solutions. Based on this, we may conclude that a) dimethyl amide is a Lewis base b) dimethyl amide is a Bronsted base c) dimethyl amide is an Arrhenius base d) both b and c e) Both a and b and c 3 7) A buffer solution is formed by adding 0.0100 moles of potassium dihydrogen phosphate (KH PO.) and 0.0100 moles of potassium hydrogen phosphate (K,HPO4) into 1.000 liters of water. When 0.0010 moles of NaOH is added to this solution, what will happen? a) The pH of the solution will increase by a small amount (<0.10 pH units) b) The pH of the solution will increase by a large amount (> 0.10 pH units) c) The pH of the solution will be exactly the same as before the addition of the NaOH d) The pH of the solution will decrease by a small amount (<0.10 pH units) e) The pH of the solution will decrease by a large amount (> 0.10 pH units) 8) For the chemical reaction NH3(aq) + HCl(aq) NH:"(aq) + Cl(aq) the acid and conjugate base are a) HCl(acid); C (conjugate base) b) HCl(acid), NH (conjugate base) c) HCl(acid), NH." (conjugate base) d) NH, (acid); NH.(conjugate base) e) NH, (acid); C (conjugate base)

Answer 1

5) For exothermic reaction, on increasing temperature value of equilibrium constant decrease so optio (b) is perfect ans

ANS- b

as Relation blo AH 4 Temp fk @te Confequitibrium constant) 컴 님 " st 초 ㅛ as Tz 시시 tue. 中 ve T ㅍ It must be negative R 매 0