Recently Active Physical Chemistry Questions

The incorrect statement/s w.r.t isothermal reversible expansion of an ideal gas from among the following is/are : (a) The change in Entropy of 1 mole of an ideal gas is given by ΔSsys = R ln V1/V2 (b) ΔSsurr = - qrev/T (c) ...

Calculate the n-factor of K2MnO4 in acidic medium ...

Do you think a score of 213 is enough to clear NSEC ? ...

Q : 2 H2 + O2 → 2 H2O This reaction is exothermic in the forward direction: 2 H2 + O2 → 2 H2O + 285 kJ but endothermic in the reverse direction: 2 H2O + 285 kJ → 2 H2 + O2 Consider a general reversible reaction such as: ...

Q. There are four compounds X,Y,Z,W whose standard reduction potentials are -0.8V, 0V, 0.8V and 1.5 V Which of these can act best as both reducing and oxidising agent? (a) X (b) Y (c) Z (d) W ...

What is the pH of a solution prepared by mixing 0.0100 mol HA (with Ka = 1.00*10-2) and 0.0100 mol of A- and diluting with water to 1.00 L? ...

1 mole N2H4 loses 10 moles of electrons to form a new compound Y . assuming that all nitrogen appear in the new compound, what is the oxidation state of nitrogen ? ( there is no change in ON of hyogen )..... a) -1 b) -3 c) +3 ...

At high pressure eqn is P(V-nb)=nRT naa ??? At low presure eqn is (P+n2a/V2)V=nRT ?? what is eqn when force(attraction) is neglible ??? ...

What is the exact relationship between equivalent conductivity(Λ) and concentration? Is the relation Λ= κ/C valid at infinite dilution.... but then κ∞=CΛ∞=0xΛ∞=0... And another thing what will be the graph of Λ v ...

1.16 g CH3(CH2)nCOOH was burnt in excess air & the resultant gases ( CO2 & H2O )were passed thru excess NaOH solution . The resulting solution is divided into 2 equal parts.One part required 50 mL of 1 N Hcl for neutralizatio ...

The ideal gas model assumes that there are no interactions between gas particles. Particles in a real gas do interact through a range of forces such as dipole–dipole forces, dipole–induced– dipole forces, and van der Wa ...

Equivalent conductance=Λ= κ/C of a C normal solution, so am I right in presuming that κ=CΛ is the equivalent CONDUCTIVITY? If so , we have to plot κ vs C of a strong electrolyte I tried to proceed as follows : Λ=Λ0- b ...

Which of the following are state functions? (A)Internal Energy (B)Composition (C)Pressure (D)Temparature (E)Vo;ume (F)Work ...

Which of the following statements is correct about the conduction of electricity in pure crystal of Si at room temparature? (A)The conduction is due to the holes formed from the release of electrons (B)The conduction is due t ...

10 ml saturated solution of Na2SO4 gives .233gm of whit ppt of barium sulphateon reaction with barium chloride.wht is solubility of sodium sulphate ...

BOIling point f benzene is 80* C....wht is latent heat of vaporization if 1 molal solution of a non-electrolyte in benzene boils at 85.12*C...express result in KJ/mol ...

http://gravityandlevity.wordpress.com/2009/05/02/when-nature-plays-skee-ball-the-meaning-of-free-energy/ ...

Calculate the vapour pressure of solution having 3.42 g cane sugar in 180 g of water at 40 °C and 100 °C .Given that boiling point of water is 100 °C and heat of vaporization is 10 Kcalmol-1 in the given temperature range. ...

A balloon of diameter 20 meter weighs 100 Kg.Calculate its pay load , if it is filled with He at 1.0 atm and 27 °C. Density of air is 1.2 Kgm-3. [R=0.082 dm3 atm K-1 mol-1 ] ...

MORE THAN ONE OR ONE 1) For a first order reaction(with a single reactant) the concept of half life (t1/2 = 0.693/k) fails when the reacting molecules are less.Based on this which of the following statements is appropriate? ( ...

An engineer claims to have developed an engine which develops 3.4 kW while consuming 0.44 Kg of fuel of calorific value of calorific value of 41870 kJ / kg in one hour. The maximum and minimum temperatures recorded in the cyc ...

Q1 Change in vol delta V on mixing acetic acid (A) and benzene (B) is plotted against %benzene *Image* a)A-B bon dweaker than either A-A bond or B-B bond b)A-A bond is weaker than B_B bond c)B-B bond is weaker than A-A bond d ...

Very simple problem. 75.2 g of phenol is dissolved in solvent of Kf = 14, if the depression in freezing point is 7 K. What is the % of phenol ? ...

Pb(IO3)2 a sparingly soluble salt in water has a Ksp= 2.6*10-13 . To 35 mL of a 0.15 M Pb(NO3)2 solution, 15 mL of a 0.8 M KIO3 is added and a ppt. is obtained. Find the concentrations of Pb2+ and IO32- left in the solution. ...

Consider a large hollow sphere of radius 'R' in which small solid sphere of radius 'r' has to be placed in closest pascking. ( assume r=R/10) 1) Maximum no. of small spheres that can be filled into the large hollow sphere are ...

In mineral A2B, atoms B form CCP structure while A atoms occupy the voids within this structure. What are the coordination numbers of atoms A and B ? Name the voids in which atoms A are present and what fraction of these void ...

He can be excited to 1s1 2p1 configuration by light of 58.44 nm . The lowest excited singlet state , with the configuration 1s 1 2s 1 , lies 4857 cm-1 below the 1s1 2p1 state . What would be the average He - H bond energy hav ...

when we mix solute in solvent to prepare a non ideal solution showing +ve deviation the solution becomes (1)hot (2)cold (3)may become cold or may be hot (4)none of these answer with explanation ...

Which of the following statement(s) is/are true regarding Langmuir's absorption isotherm ? A. It explains only mono layer absorption. B. Molecules absorbed at one site do not interact with surrounding adsorbate molecules. C. ...

which is /are correct about emulsions? 1>demulsification can take place by chemical method only 2>small amount of water can not be mixed in water in oil emulsion 3>sodium oleate is used to prepare oil in water emulsi ...