Questions asked by Neha K.

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• 0.1M Formic Acid solution is titrated against 0.1 M NaOH solution. What would be the difference in pH between 1/5 and 4/5 stages of neutralization of acid?
  
• H+ ion Concentration of water doesn't change by adding - a. CH3COONa b. NaNO3 c. NaCN d. Na2CO3. Which one is the correct option?
  
• How is the equivalent weight of As2S3 related to its molecular weight in the following reaction : As2S3 + H+ + NO3- ------> NO + H2O + AsO4 3- + SO4 2- ?'
  
• What is the ratio of pH of 0.1M H2SO4 and 0.1N H2SO4?
  
• What will be the product when C6H6Cl6 is heated with alc. KOH? Please explain the mechanim too.
  
• What will be the value of #t_(0.875)/(t_(0.500))# for #n#th order reaction?
  
• The activation energy of the reaction, A+B----> C+D+ 38kcal is 20kcal. What would be the activation energy of the reaction, C+D -----> A+B?
  
• For the first order reaction A----> B+C carried out at 27°C if 3.8×10^-16 % of the reactant molecules exist in the activated state then what would be the activation energy of the reaction ?
  
• In a first order reaction A---> B the ratio of molar concentration of A and B in the reaction mixture after 100 minute is 1:3. What would be the time needed from the start to have them in the ratio of 1:1?
  
• For a first order reaction if the time for 50%, 75% and 87.5% changes are t1, t2 and t3 respectively then what would be the value of t1: t2: t3 ?
  
• The magnification is more than unity when object is placed at a distance d from a convex lens. Its focal length is 20 cm. What is the value of d? Options: a. Greater than 20 cm b. Less than 20 cm c. 40 cm d. Greater than 20 cm and less than 40 cm
  
• Which of the following complexes exhibit the highest paragmagnetic behavior? a. [Co(ox)2(OH)2]^- b. [Ti(NH3)6]^3+ c. [V(gly)2(OH)2(NH3)2]^+ d. [Fe(en)(bpy)(NH3)2]^2+
  
• In 68nm long DNA segment, 30% adenine is present, then calculate how many hydrogen bonds are present in this segment?
  
• Which of the following has a longer C-C bond length and why? a. C2H4 b. K[PtCl3(C2H4)]