The most pure form of carbon among the options is from General

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 Multiple Choice QuestionsMultiple Choice Questions

21.

Helium is added to the oxygen supply of deep sea divers because it is............

  • less poisonous than nitrogen

  • lighter than nitrogen

  • readily miscible with oxygen

  • readily miscible with oxygen

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22.

SMOG is a combination of 

  • Air and water vapour

  • Water and smoke

  • Fire and water

  • Fire and water

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23.

Why is Carbon Monoxide a pollutant?

  • Reacts with haemoglobin

  • Makes nervous system inactive

  • It reacts with Oxygen

  • It reacts with Oxygen

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24.

From the following, who was the first women speaker of Lok Sabha?

  • Sushma Swaraj

  • Margret Alva

  • Meera Kumar

  • Meera Kumar

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25.

Why does ice covered in sawdust not melt quickly?

  • Sawdust does not allow the air to touch the ice

  • The water is absorbed by sawdust

  • Sawdust is a bad conductor of heat

  • Sawdust is a bad conductor of heat

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26.

Which one of the following weeds is effective in controlling water pollution caused by industrial effluents?

  • Parthenium

  • Elephant grass

  • Water hycinth

  • Water hycinth

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27.

The most pure form of carbon among the options is

  • Anthracite

  • Lampblack

  • Graphite

  • Graphite


A.

Anthracite

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28.

______________ gives hardness to stainless steel.

  • Zinc

  • Lead

  • Carbon

  • Carbon

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29.

Activated Charcoal is used to remove colouring matter from pure substances by _____________

  • Bleaching

  • Oxidation

  • Adsorption

  • Adsorption

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30.

Chernobyl disaster is the result of pollution by

  • Oil spill

  • Acid rain

  • Carbon dioxide

  • Carbon dioxide

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