If $ 1000{{ }}g $ solution of $ 40\% $ solute (by weight) was cooled. $ 200{{ }}g $ of solute precipitated out. The $ \% $ concentration remaining solution is:
(A) $ 25\% $
(B) $ 20\% $
(C) $ 30\% $
(D) $ 35\% $

Hint: The measure of solute broke up in a unit measure of dissolvable. The property of a solute (air, water or gas) to break up in a solvent (air, water or gas). A synthetic arrangement containing the greatest measure of solute present in the dissolvable is called a soaked arrangement. Soaked arrangements can break up nothing else of the solute. Immersion purpose of any fluids relies upon the nature of the substance and temperature.

Complete Step By Step Answer
Saturated solution: A-soaked arrangement is one in which you can't disintegrate any greater amount of solute at a given temperature. It implies that this sort of arrangement as of now contains the greatest measure of solute that you can break down in it at a given temperature.
Unsaturated solution: An unsaturated arrangement is one in which you can break down greater amounts of solute at a given temperature.
Given,
Complete load of arrangement = $ 1000{{ }}g $
 $ \% $ of solute = $ 40\% $
 $ \Rightarrow $ Weight of solute = $ \left( {40/100} \right) \times 1000 = 400{{ }}g $
Measure of solute encouraged = $ 200{{ }}g $
Measure of solute remaining = $ 200{{ }}g $
Weight dissolvable leftover = $ 600{{ }}g $
% Weight of solute = $ 200/200 + 600 \times 100 = 25\% $
So, the answer is option A.

Additional Information
The concentration of a solution is the measure of solute present in a given amount of the arrangement. At the end of the day, the centralization of an answer is the mass of solute in grams present in $ 600{{ }}g $ of the arrangement. In light of this definition, there are two principal sorts of arrangements. The arrangement that has a modest quantity of solute is called Weaken Arrangement. The arrangement that has a lot of solute is called Concentrated Arrangement. This is an extremely tight division of arrangements. Allow us presently to take a gander at the kinds of arrangement in more profundity.

Note
The concentration of solution is a proportion of the measure of solute that has been disintegrated in a given measure of dissolvable or arrangement. A concentrated arrangement is one that has a generally huge measure of disintegrated solute. A weak arrangement is one that has a generally limited quantity of broken down solute. Be that as it may, these terms are relative, and we should have the option to communicate focus in a more precise, quantitative way.