Un-Answered Questions { Physical Chemistry }

Why does the experimental lattice enthalpy of NaI differ greatly from the theoretical lattice enthalpy?

2276


How to accelerate electron capture decay?

1190


The use of vermilion on rubric of the Tartar Relation is confirmed by the presence of three lines attributed to HgS. Why should this diatomic have more than one vibrational line?

1440


WHAT IS THE SYLLABUS OO GROUP -I?

1019


Normally entropy is expressed as q/T. But, work and heat have same unit. Why can't it be replaced by work?

1068





what are UV rays absorbs slightly?

971


What is the brigg's raucher reaction?

1037


During Soundness testing of Cement by Lechatelier method the Cement mould expands about 20 mm when merged in curing water for 24 hours after mould preparation.In that Cement MgO content is about 3.0%,SO3 is about 2.6% & Blaine is about 360 M2/Kg.Guess the reason & suggest solution.

1810


In testing of Cement the formula for water requirement for setting time is as below- Water required for setting time = NC x 0.85 The question is that what is the logic of 0.85 in this formula??

1272


what is the difference between elctrefining and electrolysis?

985





Sr-90, a radioactive isotope, is a major product of an atomic bomb explosion. It has a half life of 28.1 year. Calculate the first order rate constant for this nuclear decay and the fraction of 90Sr that remains after 10 half lives?

4693


The rate constant for the second order reaction is 0.54/M.s at 300oC. How long (in sec) would it take for the concentration of NO2 to decrease from 0.62M to 0.28 M? 2NO2(g) 2 NO(g) + O2(g)

1297


4 Identify the substance oxidized, reduced, oxidizing agent and reducing agent for the following reactions

1245


. Given that 2Hg2+ (aq) + 2 e- Hg22+(aq) E0 =0.92V Hg22+ (aq) + 2 e- 2Hg(l) E0 =0.85V Calculate standard free energy change and K for the following process at 25oC Hg22+(aq) Hg2+ (aq) + Hg(l)

4390


Write the each half cell reaction and also net cell reaction for a cell

1627