Question

name the following


1. The process of conversion of free atmospheric nitrogen into usable compounds____.

2. A weak acid formed when carbon dioxide dissolves in water
_________________________

.3. The amount of moisture in the air____________.

4. A deposit of minute ice crystals that are formed when water vapour get condensed at a temperature below freezing______.


Identify the error in the given statements. Circle the incorrect word and write the correct word in the blank



1. Oxygen is mainly present as a triatomic molecule._________

2. A mixture of oxygen and sulphur dioxide is used as a medical anaesthesia gas.________

3. Trinitrotoluene is used as a refrigerant in hospitals for storing and preserving blood, tissues and cornea of the eye._________

4. Carbon dioxide is 3.5 times heavier than air.___________

5. Carbon cycle is the natural process by which water is circulated throughout
the earth __________.

6. Among all the inert gases, krypton is the most abundant in air._____________

Choose the correct option.


1.__________________
proved that air is a mixture of
gases.
(a) Jean-Antoine Chaptal
(b) Daniel Rutherford
(c) Antoine Lavoisier
(d) None of these

2. Which of the following is used as a rocket propellant?
(a) Carbogen
(b) A mixture of oxygen and nitrous oxide
(c) A mixture of oxygen and sulphur dioxide. (d) Liquid oxygen

3. Which of the following is an important constituent of proteins that are necessary for the growth of plants and animals?
(a) Argon
(b) Carbon dioxide
(C) Nitrogen
(d) Krypton

4. Carbon dioxide is added to the atmosphere by
(a) respiration
(b) combustion of fossil fuels
(c) volcanic eruptions
(d) all of these

5. Which of the following is precipitation that consists of small pellets of ice formed by the freezing of
raindrops or of melted snowflakes?
(a) Fog
(b) Sleet
(c) Snow
(d) Hail

6. Which of the following inert gases is used for welding metals?
(a) Helium
(b) Neon
(c) Argon
(d) Xenon
​

Answer 1

NAME THE FOLLOWING

1. spontaneous combustion

2.soda water

3 smog

4.acid

5.humidity

6.frost