# Recently Active Physical Chemistry Questions

• at 380 degree C, the half life period for the first order decomposition of H2O2 is 360 min. The energy of activation of reaction is 200 kJ/mol. Calculate the time required for 75% decomposition at 450 degree C ...
replied2009-03-27 23:10:36
• The time required ofr 10% completion of a first order reation at 298 K is equal to that required for its 25% completion at 308 K. If pre exponential factor for the reaction is 3.56 x 109 s-1, calculate its rate constant at 31 ...
replied2009-03-27 23:09:15
• The rate constant for the first order decomposition of a dcertain reaction is described by the equation log_{10} k(s^{-1})=14.3-\frac{1.25\times10^4K}{T} A) What is the energy of activation for this reaction? B) At what tempe ...
replied2009-03-27 23:07:05
• A hydrogenation reaction is carried out at 500K. If the same raction is carreid out in th epresence of a catalyst at the same rate the temperature required is 400K. calculate the Activation energy of the reaction if the catal ...
replied2009-03-27 22:59:02
• The rate constant for an isomerisation reaction A-->B is 4.5x107 at 100 degree C. and 1.5x107 at 50 degree C. Evealuate Arrhenius parameters A and Ea yes tapan something was missing ;) ...
replied2009-03-27 22:58:51
• The rate of first order reaction is 0.04 mol L-1 s-1 at 10 minutes and 0.03 mol L-1 s-1 at 20 minutes after initiation. Find the half life of the reaction. ...
replied2009-03-27 22:55:31
• Hyelo everyone... i juzz wanna know what topics are crucial from jee point of view to revise at dis peak tym... here is d list of all topics... juzz help me out in revising d most useful n important ones... GENERAL MOLE CONCE ...
replied2009-03-27 21:52:26
• 1) Equal weights of methane and oxygen are mixed in an empty container at 25 degree. The fraction of the total pressure exerted by oxygen? a)1/3 b)1/2 c)2/3 2) At const vol. for a fixed no of moles, pressure of a gas increase ...
replied2009-03-27 17:34:01
• Parameters of monoclinic unit cell satisfies that of orthorhombic primitive unit cell's.....does it mean.......that orthorhombic..is a type of monoclinic primitive unit cell...???? ...
replied2009-03-27 09:11:00
• for the coagulation of 100ml of arsenous sulphide sol 5ml of 1M nacl is required. the coagulation value of nacl is ...
replied2009-03-26 21:19:34
• Match the following: E energy K kinetic energy V Potential energy r Radius n orbit \begin{vmatrix} & Column 1 & Column 2 \\ A) & V_n/K_n=? & 0 \\ B) & \text{if radius of nth orbit} \propto E_n^x, x=? & -1 \\ C) & \text{Angula ...
replied2009-03-26 21:15:00
• In isotghermal ideal gas COMPRESSION : True/False wid reason pl. 1) Î”G is +ve 2) Î”S is -ve I wnna know the reasons pl....... ...
replied2009-03-26 21:11:00
• 75.2 g of Phenol is dissolved in a solvent of Kf=14. If the depression in freezing point is 7K then find the % of phenol that dimerises. ...
replied2009-03-26 20:29:37
• Parameters of monoclinic unit cell satisfies that of orthorhombic primitive unit cell's.....does it mean.......that orthorhombic..is a type of monoclinic primitive unit cell...???? ...
replied2009-03-26 09:42:57
• The molar volume of liquid benzene(density=0.887 g / ml) increases by a factor of 2750 as it vaporizes at 20 degree C and that of liquid toulune (density = 0.867 g/ml) increases by a factor of 7720 at 20 degreeC. A solution o ...
replied2009-03-26 09:19:08
• NOW for H3PO4 Ka1=10-4 Ka2=10-7 Ka3=10-10 Find the pH of: 1)mixture of NaH2PO4 (0.1M + Na3PO4(0.1M) 2)H3PO4(0.1M) +NaOH in 1L solution each ...
replied2009-03-26 09:10:17
• for H3PO4 Ka1=10 to the pow.(-4)..Ka2=10^(-7),Ka3=10^(-10) ...
replied2009-03-26 08:19:53
• Could Sum1 Pls Explain "Equivalence Point"?...I searched in all standard books but got no complete info.....i think i question related to this also came in JEE08............Pls Help ...
replied2009-03-25 19:49:05
• A solution of a anon volatile solute in water freezes at -30 degree C. The vapour pressure ofthe pure water at 298K is 23.51 mm Hg and Kf for water is 1.86 K kg/mol. Calculate the vapour pressure o fthis solution at 298k ...
replied2009-03-25 09:11:09
• Q 1 ) for a d electron, the orbital angular momentum i s A) 6 (h/2pi) B) 2 (h/2pi) C) (h/2pi) D) 2(h/2pi) Q2) The orbital angular momentum of an electron in 2s orbital is A)1/2 . h/ 2pi B) zero C) h/ 2pi D) 2 h/ 2pi Q3) The f ...
replied2009-03-25 08:51:01
• a ball of mass 100 g is moving with 100 ms-1. 1 mark JEE 2004 :P ...
replied2009-03-25 07:33:41
• Q 1 ) number of radial nodes of 3s and 2p orbitals are respectively.. Q 2) Quantum numbers +1/2 and -1/2 for the electron spin represent A) Rotation of the electron in clockwise and anti clockwise directio nrespectively B) Ro ...
replied2009-03-25 07:12:22
• With what velocity should alpha particle travel towards the nucleus of a copper atom so as to arrive at a distance of 10-13 metre from the nucleus of the copper atom. ...
replied2009-03-25 07:02:56
• The Schorodinger wave equation for hydrogen atom is ψ \Psi_{2s}=\frac{1}{4\sqrt{2\pi}}\left(\frac{1}{a_0} \right)^{3/2}\left(2-\frac{r_0}{a_0} \right)e^{-r_0/a_0} where a0 is the Bohr's radius, if the radial node is 2s be ...
replied2009-03-25 06:55:31
• This may be simple but I'm not too comfortable with ionic(even the simplest[2][2]). So pls help !!! A young scientist performs the foll. set of experiments to find the pH of the resulting soln. at diff. equivalence pts. ,the ...
replied2009-03-24 21:54:41
• to 500 cm^3 of water, 3.0x10-3 kg of acetic acid is added. If 23% of acetic acid is dissociated, what will be the depression in freezing point? Kf and density o fwater are 1.86 K kg/mol and 0.997 g/cm^3 respectively. ...
replied2009-03-24 09:19:05
• Nitrobenzene is formed as the major product along with a minor product in the reactionof benzene witha hot mixture of nitric acid and sulphuric acid. The minor product consists of carbon: 42.86%, Hydrogen:2.4%, nitrogen:16.67 ...
replied2009-03-24 09:16:02
• 1.22g of benzoic acid is dissolved in 100 g of acetone and 100g of benzene seperately. Boliing point of the solution in acetone increases by 0.17 degree C, while that inthe benzene increases by 0.13 degree C; Kb for acetone a ...
replied2009-03-24 09:07:44
• *Image* ...
replied2009-03-24 01:53:59
• 1.) the molecularity of the reaction 2 H2(g) + O2(g) --> 2 H2O (l) is: a)2 b) 3 c)undefined d)1 2) the rate consant for a first order reaction is equal to the initial rate of reaction wheb the initial concentration of the ...
replied2009-03-22 04:50:43