Question

difference between hand picking and seiving

Answer 1

Answer:

handpicking : this method is used to separate impurities which are less in number and slightly large in size than the substance.

sieving : this method is used when there is difference in size between the impurities and substance.

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Answer 2

$\huge\mathfrak\orange{Answer}$

$\huge\tt\green{Hand-picking}$

• The components of a solid-solid mixture can be separated by this method.
• This is only useful when the particles are large enough to be seen.
• It is the simplest method of separation of substances.
• This method is only used when unwanted material is in small quantity.
• Example: separating pebbles from rice and dal.

$\huge\tt\green{Seiving}$

• It is a method of separating insoluble solutes from a solvent.
• It is used to separate minute particles of different sizes.
• Different sized seives are used to separate different types of mixtures containing minute particle.
• Seive is a device containing tiny holes and separate unwated material from wanted material.
• Example: seiving of flour.

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