One gram of sodium chloride takes longer to dissolve in a solution of 2M glucose than in pure water. This is because diffusion happens faster in pure water than in a solution containing a solute i.e. glucose and thus it will take longer to dissolve as a result of large number of collisions.
If you were to put 1 gram of sodium chloride (NaCl) in a beaker of pure water, it would eventually dissolve. However, if you dissolve same amount of sodium chloride (NaCl) in a beaker of water containing 2 moles of glucose, sodium chloride would take longer to completely dissolve.
The reason for this is that, in a solution having more molecules, the sodium chloride would experience more collisions. Due to this, the rate of diffusion will slow down, and thus, sodium chloride will take longer to completely dissolve.
To put it simply, solutions having large number of molecules present exhibit slower diffusion rate than solutions with fewer molecules present. So, if you want the sodium chloride to dissolve quickly, the best way is to put it in a solution of pure water.
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