Recently Active Chemistry Questions

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 ...

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 ...

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 ...

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 ;) ...

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. ...

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 ...

After resonance c-c bond length decreases but c=c bond length increase why? can you give example..........? ...

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 ...

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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...???? ...

Write the structure of analine at pH 2 and pH 10 ...

can u pls help me out in understanding the mechanism of preparation of alkanes using LiAlH4 and alkyl halide....... y can't LiAlH4 be used with 3° halide??? what is the compound (n-C4H9)3 SnH ?? ...

Pl. help yaarion.............. pehle hi questn me clean bowled :( :'( *Image* ANS : A ...

Can sum1 simplify Organic 4 me please[2] *Image* I guessed the answer but dont have a perfect Xplanation ...

for the coagulation of 100ml of arsenous sulphide sol 5ml of 1M nacl is required. the coagulation value of nacl is ...

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 ...

In isotghermal ideal gas COMPRESSION : True/False wid reason pl. 1) ΔG is +ve 2) ΔS is -ve I wnna know the reasons pl....... ...

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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. ...

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...???? ...

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 ...

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 ...

for H3PO4 Ka1=10 to the pow.(-4)..Ka2=10^(-7),Ka3=10^(-10) ...

An aldehyde A(C11H8O2), which undergoes self aldol condensation gives benzaldehyde and two moles of B on ozonolysis. Compound B, on oxidation with silver ion gives oxalic acid. Identify the compounds A and B ...

What will be the mechanism of the reaction between an epoxide and a grignard reagent?? ...

What is Ziegler - Natta Catalyst ? Where it is used ? ...

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which one of these dsnt undergo self-ionisation?? a)N2O4(l) b)H2O (l) C) NH3(l) d) HNO3 (l) only one option correct. ans with reason... please :) ...

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