Tag: chemistry

Questions Related to chemistry

Carbondioxide is ____________ in water.

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

  1. Soluble

  2. Insoluble

  3. Both A and B depending on the place from where $CO _2$ is taken.

  4. None of these

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Correct Option: A
Explanation:

Carbon dioxide gas is fairly soluble in water.
Aerated water is a solution of $CO _2$ in water under pressure.

Carbon dioxide is a ____, ______ and ____________ molecule.

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

  1. colourless, toxic, non-linear

  2. colourless, odourless, linear

  3. colorful, odourless, linear

  4. colourless, odorless, nonlinear

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Correct Option: B
Explanation:

Carbon dioxide is a colourless, odourless and linear molecule. Its structure can be represented as $O=C=O$ The $O-C-O$ bond angle is 180 $^o$. The carbon atom is $sp$ hybridised.

At temperatures and pressures above the critical point, carbon dioxide behaves as a:

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

  1. Semiconductor

  2. Supercritical $C{O} _{2}$

  3. $CO$

  4. Dry ice

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Correct Option: B
Explanation:

Supercritical carbon dioxide is a fluid state of carbon dioxide where it is held at or above its critical temperature and critical pressure. Carbon dioxide usually behaves as a gas in air at standard temperature and pressure (STP), or as a solid called dry ice when frozen. If the temperature and pressure are both increased from STP to be at or above the critical point for carbon dioxide, it can adopt properties midway between a gas and a liquid.

$CO 2$ will form ______ at $-78.5C  \left(-109.3  F\right)$.

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

  1. Dry ice

  2. Solid ice

  3. Liquid ice

  4. Liquid gas

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Correct Option: A
Explanation:

 Gaseous or liquid carbon dioxide, stored under pressure, will form dry ice through an auto-refrigeration process if rapidly de-pressured.

The mass number of oxygen atom is:

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

  1. 16

  2. 8

  3. 12

  4. 10

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Correct Option: A
Explanation:

Atomic number = number of protons = 8
Number of neutrons = 8
Mass number = number of protons + number of neutrons
So mass number of oxygen = 16

Dissolved air contains a higher percentage of oxygen than ordinary air.

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

  1. True

  2. False

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Correct Option: A
Explanation:

Dissolved air has a higher percentage of oxygen as compared to ordinary air. Air dissolved in water contains 36% oxygen as compared to 21% in air. This is because oxygen in the air has a higher solubility than other elements in air and also there is hydrogen bonding between water and oxygen that increases its solubility.

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.