Question

which hydrocarbon burn in non sooty blue flame and suit yellow flame what happens when Methane reacts with chlorine what is restricted sprint why does soap does not work in hard water

Answer 1

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$\large\red{Question:}$
which hydrocarbon burn in non sooty blue flame ?

$\huge\blue{Answer:}$
The hydrocarbons that burn with non sooty blue flame are Alkanes.
The reason is that Alkanes are saturated hydrocarbons as these have only single bond with the carbon atoms.



$\large\red{Question:}$
which hydrocarbon burn in non sooty blue flame ?

$\huge\blue{Answer:}$
The hydrocarbons that burn with non sooty blue flame are Alkenes and Alkynes.
The reason is that Alkenes and Alkynes are unsaturated hydrocarbons as these have double and triple bond with the carbon atoms.




$\large\red{Question:}$
what happens when Methane reacts with chlorine?

$\huge\blue{Answer:}$
The reaction will be a Substitution Reaction.

The reaction occurs as :
CH₄ + Cl₂ --» CH₃Cl + HCl

When Methane reacts with chlorine,
one atom of chlorine gets substituted by Hydrogen atom resulting in formation of Chloromethane and Hydrogen Chloride gas.



$\large\red{Question:}$
what is restricted sprint

$\huge\blue{Answer:}$
Highly conc. ethanol when purified through many stages of distillation is called Rectified sprint and this process is called Rectification.

Composition of Rectified Sprint:
ethanol -95% and
water - 5%.



$\large\red{Question:}$
why does soap does not work in hard water?

$\huge\blue{Answer:}$
Soaps are sodium or potassium salts of long chain fatty acids. Soaps does not work in hard water because lather formation of the soap in hard water doesn't occurs.

Hard water contains sulphates, chlorides or bicarbonate salts of Ca2+ or Mg2+ ions

When soap is added to hard water, the Ca2+ and Mg2+ ions present in hard water react with soap. The sodium salts present in soaps are converted to their corresponding calcium and magnesium salts which are precipitated as scum. As a result, cleaning capacity of soap is reduced.


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