Tag: chemistry

Questions Related to chemistry

Which of the following process uses electrified gas which has a very high temperature?

chemistry synthetic fibres and plastics plastic and environment pollution due to plastics environmental impact: plastics

  1. Sewage treatment

  2. Plasma gasification

  3. Composting

  4. Dumping

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Correct Option: B
Explanation:

Plasma is primarily an electrically charged or highly ionised gas. it produces temperature of $13000^0F$.
Waste molecular bonds are broken and the disposal provides renewable energy in plasma gasification.

__________ is the process in which waste is buried in the land.

chemistry synthetic fibres and plastics plastic and environment pollution due to plastics environmental impact: plastics

  1. Landfill or dumping

  2. Recycling

  3. Incineration

  4. Sewage treatment

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Correct Option: A
Explanation:

Dumping or landfill focuses attention on burying the waste in the land. Dumping of waste is good for the soil as it contains compounds of nitrogen and phosphorous which acts as fertilizers.

__________  is a bio-degradation process that take organic matter i.e remains of plants,garden and kitchen waste that turn into nutrient-rich food for plants.

chemistry synthetic fibres and plastics plastic and environment pollution due to plastics environmental impact: plastics

  1. Dumping

  2. Incineration

  3. Composting

  4. Sewage treatment

Show answer
Correct Option: C
Explanation:

Composting is a easy and natural bio-degradation process that takes organic matter i.e remains of plants, gardens and kitchen waste that turn into nutrient-rich food for the plants. it is usually used for organic farming by allowing the organic materials to sit in one place for months until microbes decompose it 

Which of the following are examples of recycling by industry? 

chemistry synthetic fibres and plastics plastic and environment pollution due to plastics environmental impact: plastics

  1. The use of scrap metal in manufacture of steel

  2. The use of waste paper

  3. The recovery of energy from burning combustible waste

  4. All the above

Show answer
Correct Option: D
Explanation:

Recycling is a practice that refers to the collection and reuse of waste materials. The materials from which the items are made can be reprocessed into new products.
All the above are examples of Recycling.

Phosphate ions from fertilizers are sometimes present as contaminants in municipal sewage. These have been removed with some success by:

chemistry synthetic fibres and plastics plastic and environment pollution due to plastics environmental impact: plastics

  1. passing of chlorine

  2. heating at $70^{\circ}C$

  3. filtration

  4. passing of steam

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Correct Option: B

Which of the following is not an example of waste management?

chemistry synthetic fibres and plastics plastic and environment pollution due to plastics environmental impact: plastics

  1. Sewage treatment

  2. Composting

  3. Weeding

  4. Dumping

Show answer
Correct Option: C
Explanation:

Weeding is an important control method practiced in many crops. The removal of weeds is useful because these unwanted plants compete with the crop for space, water and nutrients.

While all the other options are an example of waste management where waste is used to produce some useful form of energy.

The _________ waste is being converted into fuel which has a high octane number. It is known as the green fuel.

chemistry synthetic fibres and plastics plastic and environment pollution due to plastics environmental impact: plastics

  1. plastic

  2. bio-degradable

  3. non-biodegradable

  4. None of these

Show answer
Correct Option: A
Explanation:

Over the years, there have been various solutions proposed – diversion, burning, etc.; however, nothing to date has proven to be a truly effective or environmentally responsible solution to the burgeoning global landfill problem.


In fact, many existing solutions have been just the opposite: costly, energy inefficient or equally as harmful to the environment as the plastic itself. 

It's only now, converting plastic waste to fuel is a solution that is not only economically viable, but that is remarkably simple and "green" as well.


Option A is correct.

When three parts of conc. HCl and one part of conc. $HNO _{3}$ is mixed, a compound 'X' is formed. The correct option related to 'X' is:

chemistry p- block elements-ii hydrogen chloride chlorine - 17 group p-block elements

  1. 'X' is known as aqua-regia

  2. 'X' is used for dissolving gold

  3. 'X' is used for decomposition of salts of weaker acids

  4. both (a) and (b)

Show answer
Correct Option: D
Explanation:

Aqua regia is also called as royal water is a mixture of nitric acid and hydrochloric acid in the  molar ratio of 1:3. Aqua regia is a yellow-orange fuming liquid.Aqua regia is used for the decomposition of weak acids.

Hene option D is correct.

A and B are two gases. A is identified with the glass rod dipped in $NH _3$ and $\mathrm{B}$ is identified with the glass rod dipped in $HCl$. Then A and B are :

chemistry p- block elements-ii hydrogen chloride chlorine - 17 group p-block elements

  1. $\mathrm{H}\mathrm{Cl},\ \mathrm{N}\mathrm{O} _{2}$

  2. $\mathrm{H}\mathrm{Cl},\ \mathrm{N}\mathrm{H} _{3}$

  3. $\mathrm{N}\mathrm{H} _{3}$, H$\mathrm{Cl}$

  4. $\mathrm{N}\mathrm{H} _{3},\ \mathrm{S}\mathrm{O} _{2}$

Show answer
Correct Option: B
Explanation:

When glass rod dipped in $NH _3$, it is $HCl$ which reacts to form $NH _4Cl$ and when dipped in $HCl$, it is $NH _3$ which react to form $NH _4Cl$. 

When vanilla extract added to _______  it still retains the sweet pleasant smell.

chemistry p- block elements-ii hydrogen chloride chlorine - 17 group p-block elements

  1. dil . HCl

  2. conc. HCl

  3. dil. NaOH

  4. conc. NaOH

Show answer
Correct Option: A
Explanation:

When vanilla extract is added to dil. HCl, it still retains the sweet pleasant smell. Its smell changes when added to a base.