Question

O by proper solvent. T u decreases as the pressure of the system increases, Melting point test, if the sample is containing some solvent, the melting point will be higher than it should be. d) The catalyst is the substance that can speed up the reaction without consumption during F D) the reaction process e) The purpose of Na2SO4 is to remove water from the aqueous layer. If any solvent turns the pH paper into blue, the solvent is alkaline. g) The time at which the compound comes off the column is called the intensity, h) Boiling chips should always be added after heating a liquid.

Answer 1

All the questions that you have answered are absolutely correct, except for question (c) and (e)

(c) In the melting point test , if the sample is containing some solvent, the melting point will be higher than it should be-

Ans- FALSE,

Reason: Solvent sticking to the sample acts as impurity that LOWERS the melting point of the sample. Say for example, a sample has a melting point of 100 degrees Celsius. If the sample hasn't been dried properly , i.e, if water is present in the sample, then the melting point of the sample would decrease to approximately 80 degree Celsius.

(e) The purpose of Na₂SO₄ is to remove water from the aqueous layer-

Ans:- FALSE

Reason:- Na₂SO₄  is a drying agent and is used to remove small amounts of water from the ORGANIC layer. Aqueous layer has huge amount of water that cannot be removed by Na₂SO₄