43. Unsaturated hydrocarbons, a. contains atleast one double or triple bonds 44.

Question

43. Unsaturated hydrocarbons,

a. contains atleast one double or triple bonds

44. A protein is a,

d. polymer of amino acids

45. after addition of 25 ml of KOH, we have reached half-equivalence point

[HNO2] left in solution = [NO2-] formed in solution

pH = pKa + log(NO2-/HNO2)

So,

pH = pKa

pKa = -log[Ka] = -log(4.5 x 10^-4) = 3.35

b. 3.35

46. The process which is endothermic in nature is,

a. sublimation

47. For a spontaneous endothermic reaction,

c. dH < 0, dS < 0, dG < 0

48. Coordination and oxidation state for central atom are,

d. 4,2

Explanation / Answer

43. Unsaturated hydrocarbons a. b. c. contain at least one double or triple carbon-carbon bond. contain at least one element other than hydrogen and carbon. contain present. the maximum number of hydrogens that can bond with the carbon atoms d. cannot form structural isomers. e. cannot undergo addition reactions 44. A protein is a. a polysaccharide. b. a saturated ester of glycerol. c. one of the units making up a nucleic acid. d. a polymer of amino acids. e. an aromatic hydrocarbon. 50.00 mL of 0.10 M HNO2 (nitrous acid, K.-4.5x 10-4) is titrated with a 0.10 M KOH solu After 25.00 mL of the KOH solution is added, the pH in the titration flask will be 45. _ b. 3.35 c. 2.41 d. 1.48 e. 7.00 Which of the following phase changes is endothermic? a. Sublimation b. Condensation 46. c. Freezing d. Deposition 47. Which of the following is consistent with a spontaneous endothermic reaction? 48. In the coordination compound [Pt(NH:)Clhl. the coordination number and oxidation central atom are, respectively, a. 2,0 b. 4,4 c. 5,0 d. 4,2. e. 6,2.

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