260 | SAMPLE EXAMINATION 2 56. The distnibution of gascous N, molocules at a cer
ID: 1041191 • Letter: 2
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260 | SAMPLE EXAMINATION 2 56. The distnibution of gascous N, molocules at a certain temperature is depicted below z. MOLECULAR SPEED, m/s If the Kelvin temperature is doubled what change will occur in this distribution? (A) The area under the curve will double. (B) The curve will shift toward higher molecular speeds (C) The maximum of the curve will become higher. (D) The maximum molecular speed will double. 57. Which solution has the largest buffer capacity und a ph? near 4? 1.0 M HOCI(K, 2.9 x 10-*) and 1.0 M NaOCI 0.50 M HOJI,os (K.-1.4x10".) and0.50 MNdGH,Os (C) 1.0 M HC,H,O, (K 14x 10) and 0.20 M NaC,H,O, ip) 1.0 M NH, (Kb-1.8x10-,)and1.0 M NH,CI 58. Which of the following carbon-oxygen species has the longest average C-O bond length? (A) CO (B) CO (C) CH,CO, (D) CO 59. Calcium carbonate solid, CaCO,, is only slightly soluble in water. Which of the following would increase the solubility of this solid in a saturated solution? (A) Add more water. (B) Add a solution containing calcium ions, Ca2"(aq), and carbonate ions, CO,2-(aq). (C) Add a solution containing hydronium ions, HyO (ng) (D) Add a solution containing hydroxide ions, OH (ay)Explanation / Answer
56) If temp is doubled then the molecules will have more energy i.e. their molecular speed will increase.
So the graph will shift towards the right side.
58) Bond length is inversely proportional to bond order.
Bond Order of CO, CO2, CH3CO2- , CO32- are 3, 2, 1.33,1.33 respectively according to lewis strucutre.
But in the two compounds also have resonance effect , In CH3CO2- the double bond is shared between two O and a carbon whle in CO32- the double bond is shared between C and 3 O atoms and hence it has more resonance effect so it has longer bond length
Hence CO32- will have the longest bond length..
59 ) Adding H3O+ ions will increase solubility.
H+ ion will recat with CO33- to form H2CO3
Hence solubilty will increase.
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