⁞ Chemistry
General Science ➤ Chemistry ➤ Miscellaneous
Question 1
Q1. A student by chance mixed acetone with alcohol. The mixture of acetone and alcohol can be separated by
Answer : fractional distillation
A student by chance mixed acetone with alcohol. The mixture of acetone and alcohol can be separated by fractional distillation.
Fractional distillation is the separation of a mixture into its component parts, or fractions. Chemical compounds are separated by heating them to a temperature at which one or more fractions of the mixture will vaporize. It uses distillation to fractionate.
Generally the component parts have boiling points that differ by less than 25 °C from each other under a pressure of one atmosphere. If the difference in boiling points is greater than 25 °C, a simple distillation is typically used.
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Question 2
Q2. The purity of the milk is determined by
[SSC Multitasking 2014]Answer : Lactometer
The purity of the milk is determined by Lactometer.
A lactometer is an instrument that is used to check for the purity of milk by measuring its density. An instrument to find out the content of the water in the milk or to test the richness of the milk is thus termed as 'lactometers'. The lactometer works on the principle of gravity of milk.
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Question 3
Q3. When the milk is churned vigorously the cream from it is separated out due to
[SSC CHSL 2013]Answer : centrifugal force
When the milk is churned vigorously the cream from it is separated out due to centrifugal force.
In Newtonian mechanics, the centrifugal force is an inertial force (also called a "fictitious" or "pseudo" force) directed away from the axis of rotation that appears to act on all objects when viewed in a rotating frame of reference.
The concept of centrifugal force can be applied in rotating devices, such as centrifuges, centrifugal pumps, centrifugal governors, and centrifugal clutches, and in centrifugal railways, planetary orbits and banked curves, when they are analyzed in a rotating coordinate system. The term has sometimes also been used for the reactive centrifugal force that is a reaction to a centripetal force.
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Question 4
Q4. The product of equivalent weight and valency of an element is equal to
[SSC CHSL 2013]Question 5
Q5. Iodine can be separated from a mixture of iodine and potassium chloride by
[SSC DEO & LDC 2013]Answer : sublimation
Iodine can be separated from a mixture of iodine and potassium chloride by sublimation.
Sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase. Sublimation is an endothermic process that occurs at temperatures and pressures below a substance's triple point in its phase diagram, which corresponds to the lowest pressure at which the substance can exist as a liquid. The reverse process of sublimation is deposition or desublimation.
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