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A 60% spirit solution is mixed with r% spirit solution in the ratio 1 : 3 such that a s% spirit solution is obtained. When a (s/3)% spirit solution is mixed with 55% spirit solution in equal ratio, an (r/2)% spirit solution is obtained. Which of the following can be determined? (A) Value of ‘r’ (B) Value of ‘s’ (C) Volume of the 60% spirit solution mixed initially (D) If 9 liters of r% spirit solution was mixed initially, what was the volume of the s% spirit solution thus obtained?
Reaction between which of the following will NOT lead to the evolution of Hydrogen gas? (A) Magnesium with dilute hydrochloric acid (B) Copper with dilute hydrochloric acid (C) Sulphur powder with dilute hydrochloric acid (D) Aluminium with dilute hydrochloric acid
In the following question below some statements are given followed by some conclusions. Taking the given statements to be true even if they seem to be at variance from commonly known facts, read all the conclusions and then decide which of the given conclusions logically follows the given statements. Statements: No solution is mixture. Each solvent is solute. All solute are solution. Conclusions: I. No solvent is mixture. II. Some solution is solvent. III. Some solute is mixture. 
A chemical solution appears green when the salt concentration is 8 grams per litre (gpl) and red when it is 10 gpl. Pure water was added to the solution of 1 litre of 15 gpl solution till it turned green. Then 125 ml of the green solution is taken out and x grams of salt is added to the green solution to make it red. Another 500 ml of the final solution was taken out and y litres of green solution is added to get a resultant solution of concentration 9.6 gpl.  Assume adding salt doesn’t change its volume and find the ratio of x and y. 
A dilute solution of sodium carbonate was added to two test tubes one containing dilute HCI (A) and the other containing dilute NaOH (B). the correct observation was:
Consider the following statements.
1. During the pressure of osmosis, the solvent travels from the concentrated solution to the dilute solution.
2. In the reverse osmosis, external pressure is applied to the dilute solution.
Which of the statement(s) given above is/are correct?
Assertion (A) In osmosis, solvent molecules pass through a semipermeable membrane from a more dilute solution to a more concentrated one, when these two are separated by the semi-permeable membrane.
Reason (R) The vapour pressure of the solvent over the dilute solution is less than that over the concentrated solution.
A very dilute solution is prepared by dissolving 'x1' mole of solute in 'x2' mole of a solvent. The mole fraction of solute is approximately equal to
In a dilute solution of elements X, Y etc. in liquid iron, the effect of Y on the activity co-efficient (fx) and the activity (hx) of X with respect to the Henrian 1wt% standard state is taken into account by the activity interaction co-efficient eyx, which is
Estimate the interfacial solute concentration in the two liquids when the solute concentration is 45000 kg-moles/m3, interfacial solute concentration in liquid is 40000 kg-moles/m3, diffusivity is 2.5 × 10-11 m2/s and the length of the tube is 5m3 and the partition coefficient is 0.25.