Recently Active Physical Chemistry Questions

Which of the following set of quantum numbers is impossible for an electron? n=1,l=0,ml=1,ms=+1/2 n=3,l=2,ml= -3,ms=+1/2 ...

What orbital has only positive values of wave function at all distances from the nucleus? 1s 2s 2p 3d ...

The mass to charge ratio for a cation is 1.5 X 10-8 kg/C.What is the mass of this atom? ...

A d-orbital can accomodate maximum 10 electrons only(True/False) My book says its false but i think it should be true Whats your take?? ...

The radii of maximum probability for 3s,3p and 3d electrons follow what order?? ...

Multiple answers correct. Select correct statements about FCC (ABCAB..) structure- a) Dist. b/w nearest octahedral void & tetrahedral void is 3 a/4 b)Dist. b/w two nearest octahedral void is a/ 2 . c) Dist. b/w two nearest te ...

What is the composition of vapour which is in equillibrium at 30°C with a benzene - toulene solution with mole fraction of benzene as 0.4? P°b = 119 torr P°t = 37 torr ...

more than one correct Q1 photoelectric effect supports quantum nature of light a)there is min frequency below which photoelectrons are emmited b)max KE of photoelectons depends only on frequency of light and not on intensity ...

The Unit Cell of a crystalline solid is bounded by f (faces) , e (edges) and c (interfacial angles) . WHich of the following relation is correct: A. f + e = c +2 B. f + c = e + 2 C. c + e = f + 2 D. NONE OF THESE ...

There is very little difference in the acid strength of H3PO2,H3PO3,H3PO4 because a)P is not a highly electronegative element b)The hydrogen atoms are not directly bonded to P atom c)Phosphorous exists in different oxidation ...

The equation for the reaction in the figure below is AB_{5}_{(g)} + heat\leftrightarrow AB_{3}_{(g)} +B_{2}_{(g)} double arrow means the reaction is in equilibrium *Image* At\; time\; 3\; min\; , what\; change\; was\; imposed ...

(Quantities) (A) Molar conductance (B) emf of a cell in operation (C) Gibbs energy change (ΔG) for a cell (D) Conductivity (Factors on which dependency exist) (P) Temperature (Q) Concentration of species involved (R) Nature ...

1) Assertion-Reason I- Decomposition of NH3 on Pt surface is a zero order reaction at lower concentration of NH3, but at higher concentration, the order becomes a first order reaction. II- Rate = \frac{K_1 \left[NH_3 \right]} ...

We usually say that s subshell is closer to the nucleus than p, d, f etc of the same shell, isn't it? But according to the plots given in the following graph, it shows that 3d is closest to the nucleus, then 3p and then 3s. S ...

How was NSEC?? there;s no topic for chem olympiads.. so posted here.. discussions on questions welcome ...

There is a section in Redox reactions Paradox of fractional oxidation no.I have understood the concept but i could not understand one thing that how do we calculate the real oxidation numbers of elements in a compoud.could an ...

1) a weak base BOH is titrated with st acid .The pH at 1/4th equivalence point was 9.24.Enough strong base(6 meq) was now added to completely convert the salt.the total voume was 50ml.find pH at the point 2)A soln is saturate ...

Q1 A sample of AgCl treated with 5mL 1.5M Na2CO3 .The remaining sln cotained 0.0026 gm of Cl- per litree.Calculate Solubity product of AgCl. Ksp=8.2*10-12 Q2 how many moles of sodium propionate should be added to 1 L of an aq ...

which would you expect to have larger(more negative) value of hydration energy : K+ or Ba2+ ? think it's K+ due to smaller size of K+,but answer given is Ba2+.Please verify. ...

According to transition state theory, rate constant (K) will depend on 1. Temperature 2. Threshold energy 3. Entropy change from reactant to transition state 4. Collision frequency ...

Can someone please post the key to the Match Matix question (Thermodynamics) that was there in the chemistry in paper 1 Thanks ...

1.B.P of H2O(l) increases when a.pressure is increased b.pressure is decreased c.when studied at mountain 2.consider the endothermic reaction; Fe3+ + cl- → Fecl2+ Eq. may be disturbed by : a.addition of Fe(NO3)3 b.addition ...

1) In the arrhenius eqn which of the following statement is assumed (A) The fraction of efeective collisions having activation energy is equal to the fraction of total collisions having activation energy (B) The fraction of e ...

PLz discuss this prob??? At pH=2, E°quinhydrone=1.3 , then Equinhydrone=???? a)1.36V b) 1.3 c)1.42 d)1.2 ...

If a cube is made such that small spheres are at the corners and large sphere is at the body centre of the cube, then what is the packing fraction of this system? 1. 0.68 2. 0.74 3. 0.52 4. 0.002 ...

Q.1 : Answer the following questions based on the potential energy diagram shown here: *Image* a. Does the graph represent an endothermic or exothermic reaction? b. Label the position of the reactants, products, and activated ...

Suppose you have done 6 litre-atm. work to raise some water by certain temperature. Specific heat capacity of water is 4.124 J g-1 K-1. Find out the work you have done (6 litr-atm.) in Joules. Plzzzzzzzzzz explain .... ...

How would you rate Arihant Objective Chemistry for Objective practise for JEE? and how many questions does it have for each topic(approx) ...

What is the n-factor of Fe2(SO4)3 in the following reaction: Fe2(SO4)3 --> FeSO4 + SO2 ? ...

Helium can be excited to 1s12p1 configuration by supplying 33.12×10-19 J of energy .The lowest excited singlet state 1s12s1 lies 5000 cm-1 below 1s12p1 state . what should be the average He-X bond energy so that HeX2 could f ...