Which of the following statements is not true about recrystallization? A compoun

Question

Which of the following statements is not true about recrystallization? A compound must be soluble in a hot solution of the recrystallization solvent Recrystallization is a technique used to purify solids The hot saturated solution should immediately be placed on ice to induce crystallization can be induced by "seeding" a saturated solution with a few crystals What physical property could you look up to know which solvent layer is which in an extraction? The melting point The molecular weight The density The GC chromatogram In an extraction procedure, it is advisable to Throw away all layers as soon as you have extracted them Save all layers until an experiment is complete Put the organic layer down the drain Put the organic layer in the aqueous waste container When you distil a 7 mL of liquid why do you need to use a 10 mL flask instead of 100 mL flask? Because the small one is easy and safe to handle Because it takes less time to heat up the liquid with the smaller flask Because the amount of liquid is too little for the size of the flask; if using the larger flask significant amount of material is lost since the vapour must fill the flask first None of the above After a separation of components (compound A and compound B) by distillation, the sample was tested by GC. Shown below is an integrated chromatogram. What is the % composition of sample A based on the GC data? 46% 34% 59% 54% A mixture of pentane, heptane and nonfan were separated by GC. The firs, compound to elute through the GC column would be: Pentane Heptane Noonan

Explanation / Answer

1)
Answer: C
rest all seemd correct to me.
this is wrong because, the solution must be cooled slowly

2)
Answer: C
High density solvent will be at the bottom and lower density one will be on the top

I am allowed to answer only 1 question at a time

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