AIR

Gap-fill exercise

  
Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
Oxygen exists in nature as , carbonates, oxides and .

Metals like magnesium, iron and sodium burn in oxygen and give oxides.

Bacteria convert atmospheric nitrogen directly into nitrogen compounds.

Carbon dioxide is in nature and turns lime water milky.

refers to an average increase in the temperature of the atmosphere.

Gaseous jacket that surrounds the earth is called .

Process that converts nitrogen in the air into a nitrogen compounds is .

Trapping of radiation from the sun by green house gases in the atmosphere that leads to rise in the earth’s atmospheric temperature is called effect.

Synthesis of ammonia from nitrogen and hydrogen with the help of catalyst under 500 atm pressure and 550˚C temperature is called Process.

Soda water is the water produced when carbon dioxide is dissolved in water under .

Process of conversion of solid directly to vapour without reaching liquid state is called .