Recently Active Physical Chemistry Questions

1) The dissociation const of monobasic acids A,B,C and D are 6 X 10 -4, 5 X10 -5 , 3.6 X 10 -6 and 7 X10 - 10 respectively. pH values of their 0.1 molar aqueous solution are in the order (a) A >B> C >D (b) D>B> ...

The pink violet colour ok KMnO4 is due to: (a) d-d transition (b) p-d transition (c) charge transfer (d) Both (a) & (c) ...

1) Equal volume of two solution having pH = 2 and pH = 10 are mixed together at 90° C. Then pH of resulting solution is: (Take Kw at 90°C = 10-12 ) [a] 2 + log 2 [B] 10 - log 2 [c] 7 [d] 6 2) The ionazation constant of benz ...

1) Which of the following concentrations of NH4 + will be sufficient to prevent the precipitation of Mg(OH)2 from a solution which is 0.01 M in MgCl2 and 0.1 M NH3 (aq). Given that Ksp of Mg (OH)2 = 2.5 x 10-11 and Kb for NH3 ...

A soln of weak acid was titrated with NaOH. The equivalence pt. was reached when 36.12 ml of 0.10 (N) NaOH have been added. Now 18.06 ml of 0.1(N) HCl was added to the titrated soln.The pH was found to be 4.92. What's Ka of a ...

here "they" means "the book" please give me the answer soon of the last given question from "periodic table". ...

equal vol of 2 soln of pH=2 and pH=5 are mixed/Find pH of resulting soln.. ...

1. Given the following equations: 4 NH3 (g) + 5 O2 (g) → 4 NO (g) + 6 H2O (l) ΔH° = -1170 kJ 4 NH3 (g) + 3 O2 (g) → 2 N2 (g) + 6 H2O (l) ΔH° = -1530 kJ Using these two equations, determine the heat of formation, ΔHf ...

2MnO-4 + 5 H2O2 + 6H+ ---> 2Mn2+ + 8H2O + 5O2 Which of the following r not true ? A) H2O2 is oxidised to O2 B) H+ IS OXIDIZED TO WATER C)Oxdn no. of Mn changes by 6 D) H2O2 is reduced by H2O ...

100ml, of CH3COOH is titrated against 0.2NaOH. which is/are coreect statements? a. ph>7, at equivalence point b. ph<7 at 3/4th equivalence point c.ph<7 at equivalence point d. ph>7 when 80ml of NaOH is added ...

NO2 AND NO WAS MIXED IN THE RATIO OF 2 :1 AT 300K, IN ONE LITRE VESSEL AND MIXTURE WAS BROUGHT TO EQUILIBIRIUM FORMING TWO EQUILIBRIA 2NO2 <-----> N2O4 Kp=8.48 ATM-1 NO +NO2 <-----> N2O3 THE EQUILIBRIUM PRESSURE W ...

200ml of HCL(aq.) havin ph=2 is mixed with 300ml of NaOH(aq.) having ph =12. concentration of OH-1 in the mixture will be x *10-3, mole/l. value of x is..? a. 1 b. 2 c. 3 d. 4 ...

Match the column Column 1 [A] *Image* (g) → *Image* (g) [B] I2(s) → I2(aq) [C] N2O4(g) → 2NO2(g) [D] AgI(s) → Ag+(aq) + I-(aq) Column 2 [P] *Image* [Q] *Image* [R] *Image* [S] *Image* Note: "→" represents an reversi ...

in periodic table,to find out the valency of "substance hydride",they have done,in which substance the valency comes to "5",they are deducting the number from "8" and the valency becomes "3". my question is "is this rule can ...

Which of the following will give acidic solutoin 1) Na2CO3 2) H2S 3) CuSO4 4) NaBr ...

COLUMN - I COLUMN -II (A) If S.O.P of a substance is (P) Oxiadtion of substance is exists b/w -1.23 to -0.81 V not possible (B) If S.O.P of substance is (Q) Possible only in acidic exists b/w -0.81 V to -0.40 V medium (C) If ...

At 200*C PCl5 dissociates as follows: PCl5(g) + PCl3(g) +Cl2(g) It was found that the equilibrium vapours are 62 times as heavy as hydrogen.Find the degree of dissociation of PCl5 at 200*C.. ?? ...

Q1 Find out volume strength of H2O2 to eb added (V=1L) in an incomplete titration mixture of NaHC2O4 with NaOH.If mixture has ben prepared by mixing 500g of NaHC2O4 in 2L,0.5M NaOH.Assume H2O2 is st. reducing agent Q2 Solid N ...

STATEMENT-1 : Simplest formula of a CCP unit cell of Buckminster fullerenes in which all the T-voids and O-voids are occupied by K is K3C60. and STATEMENT-2 : Simplest formula is KC20. 1. Statement-1 is True, Statement-2 is T ...

N2 + 3 H2 → (equilibrium) 2NH3 is a gaseous phase equilibrium reaction taking place in a 5-litre flask at 400 K. For this choose the correct alternative : A) Kc = Kx B) Kc = 25 Kx C) Kx = 25 Kc D) Kc = 5 Kx ...

Out of the following, which graph between PV versus P correctly resembles for N2 at different temperatures? *Image* ...

The solubility of Mg(OH)2 (Ksp = 10-12) in solution of pH value 12 is 1. 10-8 2. 10-6 3. 10-5 4. 10-10 ...

Differentiate and give examples of the following: 1. Isotopes 2. Isobars 3. Nuclear Isomers 4. Isosters 5. Isotones 6. Isoelectronics 7. Isodiaphers Note: Knowing this is important as many match the following, objective quest ...

Why ICl7 does exist but ClI7 does not? Why SF6 does exist but SH6 does not? ...

Can v say this ???? Electrolysis is a forced reaction. ...

A solid mixture(5.0gm)consisting of lead nitrate and sodium nitrate was heated below 600°c until the weight of the residue was constant.If the loss in weight is 28%,find the amount of lead nitrate and sodium nitrate in the m ...

The Degree of dissociation of I2 molecule of 1000*C and under atmospheric pressure is 40% by volume.Find the total equilibrium pressure on the gas if the dissociation is reduced to 20% at the same temp. ...

The pH of 0.1 M solution of the following salts increases in the order : (A) NaCI < NH3CI < NaCN < HCI (B) HCI < NH4CI < NaCI < NaCN (C) NaCN < NH4CI < NaCI < HCI (D) HCI < NaCI < NaCN < NH ...

If D(t) and D(o) are the theoretical and observed vapour densities at a definite temperature and @ be the degree of dissociation of a substance. Then, find @ in terms of D(o),D(t) and n (number of moles of products formed fro ...

In a vessel containing N2.H2 and NH3 at equilibrium,some helium gas is introduced so that pressure increases while temperature and volume remain constant.According to Le Chatelier’s principle, the dissociation of NH3 [A]inc ...