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Dimethyl glyoxime in a suitable solvent ...

Dimethyl glyoxime in a suitable solvent was refluxed for 10 minutes with pure pieces of nickel sheet, it will result in

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Insulin (C_(2)H_(10)O_(5))_(n) is dissolved in a suitable solvent and the osmotic pressure pi of the solution of various concentration ( in kg//m^(3)) is measured at 20^(@)C . The slpe of a plot of pi against c is found to be 8.134xx10^(-3) ( SI units ). The molecular weight of the insulin ( in kg//mol) is :

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(a) Sulphur dioxide gas turns a dichromate solution green. Write the reaction. (b) Also write the reaction when nickel salts in basic medium react with dimethyl glyoxime.

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Addition of non-volatile solute to solvent lowers its vapoure pressure. Therefore, the vapour pressure of a solution (i.e, V.P. of solvent in a solution) is lower than that of pure solvent in a solution) is lower than that of pure solvent, at the same temperature. A higher temperature is needed to raise the vapour pressure upto one atmosphere pressure, when boiling point is attined. However, increase in b.pt. is small . for example, 0.1 molal aqueous sucrose solution boils at 10.05^(@)C Sea water, an aqueous solution, which is rich in Na^(+) and Cl^(-) ions, freezes about 1^(@)C lower than frozen water . At the freezing point of a pure-solvent, the reates at which two molecule stick together to form the solid and leave it to return to liquid are equal when solute is present. Few solvent molecules are in contact with surface of solid. However, the rate at which the solvent molecules leave, surface of solid remains unchanged. That is why, temperature is lowered to restore the equalibrium. The freezing depression in a dilute solution is proportional to molality of the solute. The freezing point of benzene solution was 5.4^(@)C . The osmotic pressure of same solution at 10^(@)C is (freezing point of benzene = 5.5^(@)C ). Assume solution to be dilute. [ K_(f) for C_(6)H_(6) is 4.9 K "molality"^(-1) ].

Insulin (C_(2)H_(10)O_(5))_(n) is dissolved in a suitable solvent and the osmotic pressure (pi) of solutions of various concentrations (g//cm^(3))C is measured at 20^(@)C . The slope of a plot of pi against C is found to be 4.65 xx 10^(-3) . The molecular weight of insulin is:

NARAYNA-QUALITATIVE ANALYSIS-LEVEL-I(H.W)
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  11. When excess of SnCl2 is added to a solution of HgCl2, a white precipit...

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  12. Of the following sulphides which one is insoluble in dil. Acids but so...

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  13. An aqueous solution of colourless metal sulphate M gives a white preci...

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  14. AgCl is soluble in

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  15. A pale green crystalline metal salt of M dissolves freely in water. It...

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  16. On the addition of a solution containing CrO(4)^(2-) ions to the solut...

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  17. Turnbull's blue is a compound.

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  18. On passing H(2)S gas in II group sometimes the solution turns milky. I...

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  19. Dimethyl glyoxime in a suitable solvent was refluxed for 10 minutes wi...

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