Tag: chemistry

Questions Related to chemistry

The reaction between carbon and oxygen can be represented as 
$C _{(s)}+O _{2(x)}\rightarrow CO _{2(g)}+heat$
In which of the following type(s), the above reaction can be classified?
I. Combustion reaction
II. Displacement reaction
III. Endothermic reaction
IV. Combination reaction

chemistry occurrence of carbon compounds in nature importance of carbon covalent bonding in carbon compounds carbon and its forms

  1. (I) and (III)

  2. (I), (II) and (IV)

  3. (I) and (IV)

  4. (I) only

Show answer
Correct Option: C
Explanation:

$C _{(s)}+O _{2(g)}\rightarrow CO _{2(g)}+heat$
It is combination and combustion reaction.

In the Earth's crust, Carbon is found in the form of_________.

chemistry occurrence of carbon compounds in nature importance of carbon covalent bonding in carbon compounds carbon and its forms

  1. carbonates

  2. hydrogen carbonates

  3. petroleum

  4. All of the above

Show answer
Correct Option: D
Explanation:
Carbon is found in the atmosphere mostly as carbon dioxide. Animal and plant respiration place carbon into the atmosphere.

Carbon exists in the atmosphere in the form of Carbon monoxide in traces and carbon dioxide.

In the earth crust carbon is found in water, rocks, petroleum and as  carbonates. 

Carbon is also present in the form of hydrocarbons which  often use as sources of energy, such as coal, petrol and natural gas.

Which of the following is not an allotrope of carbon?

chemistry occurrence of carbon compounds in nature importance of carbon covalent bonding in carbon compounds carbon and its forms

  1. Graphite

  2. Granite

  3. Diamond

  4. Fullerene

Show answer
Correct Option: B
Explanation:

Carbon is capable of forming many allotropes due to its valency. Well-known forms of carbon include diamand, graphite and fullerenes.


Granite is not allotrope of carbon.

Hence option B is correct.

Who has synthesised the organic compound 'urea' for the first time?

chemistry occurrence of carbon compounds in nature importance of carbon covalent bonding in carbon compounds carbon and its forms

  1. Friedrich Wohler

  2. Berzelelius

  3. Kolbe

  4. None of the above

Show answer
Correct Option: A
Explanation:

In 1828, the German chemist Friedrich Wöhler obtained urea artificially by treating silver cyanate with ammonium chloride. 


This was the first time an organic compound was artificially synthesized from inorganic starting materials, without the involvement of living organisms.

An element which is an essential constituent of all organic compounds belongs to the_____group. 

chemistry occurrence of carbon compounds in nature importance of carbon covalent bonding in carbon compounds carbon and its forms

  1. 5th

  2. 8th

  3. 14th

  4. 12th

Show answer
Correct Option: C
Explanation:

Carbon is an essential element for all organic compound. It belongs to ${ 14 }^{ th }$ group. Its atomic number is $6$. Methane which is one the very famous organic compound consists of Carbon and hydrogen.

Thus all organic compounds contain carbon and hydrogen of which carbon belongs to the group $14$.

Carbon is a versatile element.
chemistry occurrence of carbon compounds in nature importance of carbon covalent bonding in carbon compounds carbon and its forms

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Carbon is a versatile element. Statement is True.
Carbon is a versatile element and is found in many different chemical compounds, including those found in space. Carbon is versatile because it can form single, double, and triple bonds. It can also form chains, branched chains, and rings when connected to other carbon atoms.

Using the given hints, identify the option with correct coal product and its use.
(1)$\;\;$Almost pure form of carbon.

chemistry occurrence of carbon compounds in nature importance of carbon covalent bonding in carbon compounds carbon and its forms

  1. Coke, manufacture of steel

  2. Coal tar, manufacture of paints

  3. Coke, manufacture of plastics

  4. Coal tar, extraction of metals

Show answer
Correct Option: A
Explanation:

Coke has few impurities and high carbon content. Coke is used as a fuel and as reducing agent in smelting iron ore in blast furnace for production of steel. The bulk specific gravity of coke is around 0.77 and is highly porous.

Water scarcity is caused due to:

chemistry water: a natural resource water resources and conservation receding water table water conservation and irrigation

  1. population growth

  2. water cycle

  3. non-melting of snow

  4. rain fall

Show answer
Correct Option: A
Explanation:

The population is a major cause of water shortage. Water is polluted when industrial wastes are deposited into water bodies thus making it unfit for human consumption. Thus there is a need for water security.

Under or non-availability of usable water is called:

chemistry water: a natural resource water resources and conservation receding water table water conservation and irrigation

  1. purification of water

  2. pollution of water

  3. rationing of water

  4. scarcity of water

Show answer
Correct Option: D
Explanation:

Scarcity of water is the under or non-availability of usable water. This water presence in the ground is very less and this may sometimes lead to draughts.

Which of the following techniques are used for rainwater harvesting?

chemistry water: a natural resource water resources and conservation receding water table water conservation and irrigation

  1. Rooftop rainwater harvesting

  2. Water is allowed to go into the ground directly from the roadside drains that collect rainwater.

  3. Both of the above

  4. None of the above

Show answer
Correct Option: C
Explanation:

The following techniques are used for rainwater harvesting
 (1) Rooftop rainwater harvesting: The rainwater is collected from the rooftop to a storage tank, through pipes.
(2) Water is allowed to go into the ground directly from the roadside drains that collect rainwater.