The ionisation energy of solid NaCl is 180 kcal/mol. The dissolution of the solid in water is endothermic to the extent of 1 kcal per mol. If the solvation energies of Na+ and Cl– ions are in the ratio 6:5, what is the enthalpy of hydration of sodium ion

Anonymous User Chemistry 07 Apr, 2020 1 Answer 57 views

At 88°C benzene has a vapour pressure of 900 torr and toluene has a vapour pressure of 360 torr. What is the mole fraction of benzene in mixture with toluene that will boil at 88°C at 1 atm pressure assuming ideal solution.

Anonymous User Chemistry 07 Apr, 2020 1 Answer 151 views


Salts of A (atomic weight 7), B (atomic weight = 27) and C (atomic weight 48) were electrolysed under identical conditions using same quantity of electricity. It was found that when 2.1g of A was deposited, weights of B and C deposited were 2.7g and 7.2g. The valencies of A, B and C are respectively.

Anonymous User Chemistry 07 Apr, 2020 1 Answer 64 views




A charged particle q is shot towards another charged particle Q which is fixed, with a speed v. It approaches Q upto a closest distance r and then returns. If q were given a speed 2v, what will b the closest distances of approach?

Anonymous User Physics Electrostatic 07 Apr, 2020 1 Answer 57 views

Two spherical conductors B and C having equal radii and carrying equal charges in them repel each other with a force F when kept apart at some distance. A third spherical conductor having the same radius as that of B but uncharged is brought in contact with B, then brought in contact with and finally removed away from both. The new force of repulsion between B and C is

Anonymous User Physics Electrostatic 07 Apr, 2020 1 Answer 73 views