The coagulation of 100 ml of a colloidal solution of gold is completely prevented by addition of `0.25 g` of starch to it before adding 10 ml of 10% `NaCl` solution. Calculate the gold number of starch.

On addition of 1 mL solution of 10% NaCl to 10 mL gold sol in the presence of 0.0250 g of starch, the coagulation is just prevented. What is the gold number of starch?

50 ml of standard gold sol needs 0.05 mg of gelatine for its protection from coagulation - Calculate gold number of gelatine.

A solution containing 10.5 grams of an alkali is completely nutralised by 500 ml of 0.5 N acid . What is the equivalent weight of the base ?

Twenty per cent of the surface sites of a catalyst is occupied by nitrogen molecules. The density of surface sites is 6.023 xx 10^(14) g cm^(-3) . The total surface area is 1000 cm^2 . The catalyst is heated to 300 K and nitrogen is completely adsorbed into a pressure of 0.001 atm and volume of 2.46 cmo. Calculate the number of sites occupied by nitrogen molecules.

When 1.0 ml of dil H_2SO_4 is added to 100 ml of a buffer solution of pH :

Fill in the blanks : The minimum milligrams of a protective colloid to be added to 10 ml of standard red gold sol, so that no coagulation takes place when 1 ml of 10% NaCl solution is added is called ………….

1 ml of 0.1 N Hcl is added to 999 ml solution of NaCl . The PH of the resulting solution will be :

The circulation of blood in human body supplies O_2 and releases CO_2 The concentration of O_2 and CO_2 is variable but on the average, 100 mL blood contains 0.02 g of O_2 and 0.08 g CO_2 . The volume of O_2 and CO_2 at 1 atm and body temperature 37^@C , assuming 10 litre blood in human body is :