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You are provided with a mixture of petroleum and water. Can you suggest a method to separate the two? - Science

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प्रश्न

You are provided with a mixture of petroleum and water. Can you suggest a method to separate the two?

लघु उत्तरीय
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उत्तर

Decantation can be used to separate a mixture of petroleum and water. The mixture is allowed to stand. Petroleum is lighter than water, so it floats over water.

Carefully, lighter layer of petroleum can be poured and separated without disturbing the heavier layer of water.

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अध्याय 5: Coal and Petroleum - Very Short Answer Questions [पृष्ठ २५]

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एनसीईआरटी एक्झांप्लर Science [English] Class 8
अध्याय 5 Coal and Petroleum
Very Short Answer Questions | Q 13. | पृष्ठ २५

संबंधित प्रश्न

Why are coal and petroleum categorised as natural resources? Give a reason as to why they should be used judiciously.


Which fossil fuel is conserved when we use bicycle for covering short distances instead of a motorbike?


Why should fossil fuels like coal and petroleum be used judiciously?


The poisonous gas which reduces the oxygen-carrying capacity of blood to a large extent is :
(a) SO2
(b) NO
(c) CO
(d) CO2


Which of the following is not a natural resource?
(a) soil
(b) water
(c) electricity
(d) natural gas


A person buys two electrical devices P and Q for lighting purposes in his house. The device P consumes only 5 units of electricity in a month but device Q consumes 15 units of electricity in a month when used for the same number of hours daily. The device Q wastes a lot of electricity by radiating energy C but P does not do so.
(a) What type of device is (i) P, and (ii) Q?
(b) Name one component which is present in Q but not in P.
(c) Name the energy C.
(d) Which device is more energy efficient : P or Q?
(e) Which fossil fuel is most likely to be conserved if all of us switch over to devices like P?


List the products of combustion of fossil fuels. What are their adverse effects on the environment?


Write an answer to the following question in your own words.

Make a list of the components we obtain from mineral oil.


We say fossil fuels will last only for a few hundred years. Comment.


We read in newspapers that burning of fuels is a major cause of global warming. Explain why.


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