Tag: air and atmosphere

Questions Related to air and atmosphere

Oxygen turns litmus paper:

chemistry air and atmosphere carbon dioxide - an oxide of carbon component of air - carbon dioxide oxides of non metal

  1. red to blue

  2. blue to red

  3. red to green

  4. no change

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Correct Option: D
Explanation:

Oxygen is neutral to litmus paper.

The colour and smell of oxygen is:

chemistry air and atmosphere carbon dioxide - an oxide of carbon component of air - carbon dioxide oxides of non metal

  1. blue, pungent

  2. yellow, rose

  3. colourless, pungent

  4. colourless, odourless

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Correct Option: D
Explanation:

Oxygen is colourless and odourless gas.

Nitric oxide reacts with oxygen to form:

chemistry air and atmosphere carbon dioxide - an oxide of carbon component of air - carbon dioxide oxides of non metal

  1. nitro oxide

  2. nitrogen dioxide

  3. nitroso oxide

  4. nitre oxide

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Correct Option: B
Explanation:

$2NO+O _2\longrightarrow 2NO _2$

Nitric oxide reacts with oxygen to form nitrogen dioxide 

Oxygen is ____ of combustion.

chemistry air and atmosphere carbon dioxide - an oxide of carbon component of air - carbon dioxide oxides of non metal

  1. supporter

  2. non-supporter

  3. partially supporter

  4. none of the above

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Correct Option: A
Explanation:

Oxygen is a supporter of combustion. Combustion does not take place without oxygen.

What happens when oxygen reacts with alkaline pyragallol?

chemistry air and atmosphere carbon dioxide - an oxide of carbon component of air - carbon dioxide oxides of non metal

  1. dark brown colour is seen

  2. it forms a complex compound

  3. black colour is seen

  4. both A and B

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Correct Option: D
Explanation:

When oxygen reacts with alkaline pyragallol solution,dark brown colour is seen and it forms a complex compound.

The chemicals used for testing oxygen are:

chemistry air and atmosphere carbon dioxide - an oxide of carbon component of air - carbon dioxide oxides of non metal

  1. nitric oxide

  2. alkaline pyragallol

  3. both A and B

  4. none of the above

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Correct Option: C
Explanation:

The chemicals used for testing oxygen are nitric oxide and alkaline pyragallol solution.

What happens when $NO$ mixes with oxygen?

chemistry air and atmosphere carbon dioxide - an oxide of carbon component of air - carbon dioxide oxides of non metal

  1. Greenish white fumes are seen

  2. No effect on NO

  3. Reddish brown fumes comes out

  4. Bluish green fumes comes out

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Correct Option: C
Explanation:

When $NO$ mixes with oxygen, reddish brown fumes of $NO _2$ appears.$2 NO _{(g)} + O _{2(g)}\rightarrow 2NO _{2(g)}$

The splint is burnt and is inserted in a jar containing oxygen. What will happen to the glowing splint?

chemistry air and atmosphere carbon dioxide - an oxide of carbon component of air - carbon dioxide oxides of non metal

  1. the splint goes off

  2. no effect

  3. rekindles glowing splint

  4. it changes its colour

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Correct Option: C
Explanation:

Oxygen is a supporter of combustion. Introducing the burning splint will rekindle it.

If dissolved ______ is not present, the aquatic life would die.

chemistry air and atmosphere carbon dioxide - an oxide of carbon component of air - carbon dioxide oxides of non metal

  1. Oxygen

  2. Nitrogen

  3. Hydrogen

  4. None of these

Show answer
Correct Option: A
Explanation:

Dissolved oxygen means the  free or  non-compound oxygen present in water or in  other liquids. Dissolved oxygen is important to many forms of life including fish, bacteria and plants. These organisms use oxygen in respiration, similar to organisms on land. Fishes obtain oxygen for respiration through their gills, while plant life and phytoplankton require dissolved oxygen for respiration when there is no light for photosynthesis.

So the given statement If dissolved oxygen is not present, the aquatic life would die.

In the following reaction, $O^{18}$ is in what?
$2MnO _4{^-}+5H _2O^{18} _2+6H^+\rightarrow 2Mn^{2+}+8H _2O+5O _2$ 

chemistry air and atmosphere carbon dioxide - an oxide of carbon component of air - carbon dioxide oxides of non metal

  1. $H _2O$

  2. $O _2$

  3. Both $(A)$ and $(B)$

  4. None of these

Show answer
Correct Option: B
Explanation:
${ 2MnO } _{ 4 }^{ - }+5{ H } _{ 2 }{ O } _{ 2 }^{ 18 }+6{ H }^{ + }\longrightarrow 2{ Mn }^{ 2+ }+8{ H } _{ 2 }O+5{ O } _{ 2 }$
In the following reaction ${ O }^{ 18 }$ labelled isotope is in ${ O } _{ 2 }$.