Frequent Physical Chemistry Questions

Given: Ag(NH3)2 1Ag+2NH3, Kc=6.2*10^-8 and Ksp of AgCl=1.8*10^-10 at 298K. if ammonia is added to water solution containing excess of Agcl(s) only .Calculate the concentration of complex in 1M aqueous ammonia ...

At 200 degree Celsius pcl5 dissociate as follows pcl5= pcl3 +cl2 .it was found that the equilibrium vapours are 62 times as heavy as hydrogen .The degree of dissociation of pcl5 at 200 degree Celsius is ...

1. Mn2+ +2H2O *Image* MnO2 +4H++2e- E0= -1.23 MnO4- +4H++3e- *Image* MnO2+2H2O E0=+1.70 Select correct statement[s]: a.Mn2+ reacts with MnO4- in acid solution to form MnO2 b.Mn(MnO4)2 is stable in acid soln. c.MnO2 di ...

2.5 litres of 1M NaOH solution is mixed with 3 litres of 0.5M NaOH solution. What is the molarity of the resulting solution? ...

Molarity of a solution of sulphuric acid is 0.8M and its density is 1.06 g/cc. Find the molality and mole fraction of the solution. ...

Menthol,a flavouring agent obtained from peppermint oil,contains carbon,hydrogen and oxygen. On combustion analysis, 1g of menthol yields 1.161g of water and 2.818g of carbon dioxide. What is the empirical formula of menthol? ...

In addition to carbon monoxide and carbon dioxide, there is a third compound of carbon and oxygen called carbon suboxide. If a 2.5g sample of carbon suboxide contains 1.32g of carbon and 1.18g of oxygen, show that the law of ...

A mixture of FeO and Fe3O4 when heated in air to constant weight gains 5% in its weight .The % of FeO in the sample is? ...

a) A 2.36 g sample of dolomite containing CaC03 and MgC03 were dissolved in 700 ml_ of decinormal solution of HCI. The solution was diluted to 2.5L and 25mL of this solution required 20 mL 0.01 N NaOH solution for complete ne ...

when NaCl is doped with MgCl2 the nature of the defect produced is? explain ...

The frequency of one of the spectral lines in the Paschen series is 2.34 * 1014 Hz. Find the principal quantum number which produces this radiations. (Please show your working) ...

Arrange O2-,F-,Na+ and Mg2+ in ascending order in terms of their: a)Effective nuclear charge b)Atomic size c)Ionization potential d)Electron affinity ...

At ordinary temperature and pressure,chlorine is a gas,bromine is a liquid while iodine is a solid. Is this because of their specific heat,intermolecular force among the molecules,density or stability? ...

Give the correct order of electronegativity of the central atom in the following compounds : a) CH3 - CH3(Ethane) 4) CH2 = CH2(Ethene) 5) CH ≡ CH (Ethyne) Also give your reasoning for the same. ...

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In Standard Hydrogen Electrode represented by Pt(s)|H2(g)|H+(aq) has the reaction H+(aq) + e-→ ½H2O.. so.. there is a gain of electrons=> reduction=> its a cathode.. the why is the standard hydrogen electrode taken a ...

In Standard Hydrogen Electrode represented by Pt(s)|H2(g)|H+(aq) has the reaction H+(aq) + e-→ ½H2O.. so.. there is a gain of electrons=> reduction=> its a cathode.. the why is the standard hydrogen electrode taken a ...

What is the total spin resulting from a d ^ 7 configuration ? ...

The percentage of void volume in face centred cubic lattice is a) 26% b) 0% c) 32% d) 74% ...

sir, i want you to ask you why does an aqueous solution of acid conduct electicity ...

Specify the coordination geometry around and hybridisation of N and B atoms in a 1:1 complex of BF3 and NH3 a)N :tetrahedral,sp3 ,B :tethedral,sp3 b)N :pyramidal,sp3 , B :pyramidal,sp3 c)N :pyramidal,sp3, B :planar,sp2 d)N :p ...

How does black body radiation prove the particle nature of light? Why can't it be explained using the wave nature? ...

Among KO2, AlO2-, BaO2 and NO2+, unpaired electron is present in a) NO2+ and BaO2 b) KO2 and AlO2- c) KO2 only d) BaO2 only ...

The co-ordination number in hcp and ccp type of metallic crystals is a) 4 b) 8 c) 12 d) 6 ...

3 metals A (270), B (80) & C (10) crystallize in simple cubic, face centered cubic and body centered cubic (bcc) phases respectively with unit cell 3, 2 and 1 Å respectively. The densities of A:B:C are in the ratio of: a) 3 ...

The freauency of one of the lines in Paschen series of a hydrogen atom is 2.34 imes {10^{14}} Hz. The quatum number, {n_2} which produces this transitions is – a) Three b) Four c) Six d) Five ...

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An element crystallizes into a structure which may be described by a cubic type of unit cell having one atom in each corner of the cube and two atoms on one of its face diagonals. If the volume of this unit cell is 24 x 10-24 ...

Assuming that Hund's Rule is violated, the bond order and magnetic nature of the diatomic molecule B2 is a.1 and diamagnetic b.0 and diamagnetic c.1 and paramagnetic d.0 and paramagnetic ...