Tag: carbon dioxide - an oxide of carbon

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

A solid form of $C{O} {2}$ called _______, is produced by supercooling heated $C{O} _{2}$ at extreme pressure in a diamond anvil.

  1. Dry ice

  2. Germania glass

  3. Silica glass

  4. Carbonia glass
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Another form of solid carbon dioxide observed at high pressure is an amorphous glass-like solid. This form of glass, called carbonia, is produced by supercooling heated $C{O} _{2}$ at extreme pressure ($40 48  GPa$ or about $400,000$ atmospheres) in a diamond anvil.
This discovery confirmed the theory that carbon dioxide could exist in a glass state similar to other members of its elemental family, like silicon (silica glass) and germanium dioxide.

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

Carbon dioxide is a ____, ______ and ____________ molecule.

  1. colourless, toxic, non-linear

  2. colourless, odourless, linear

  3. colorful, odourless, linear

  4. colourless, odorless, nonlinear
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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

  1. Semiconductor
  2. Supercritical $C{O} _{2}$
  3. $CO$

  4. Dry ice
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
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.