Tag: natural resources- air, water and land

Questions Related to natural resources- air, water and land

Which of the following can be used as dehydrating agents?

chemistry nitrogen and sulfur sulfur and its oxides acid deposition natural resources- air, water and land

  1. Conc. $H _2SO _4$

  2. $POCl _3$

  3. $P _2O _5$

  4. All of the above

Show answer
Correct Option: D
Explanation:

A dehydrating agent is a substance that dries or removes water from a material. In chemical reactions where dehydration occurs, the reacting molecule loses a molecule of water. Sulfuric acid, concentrated phosphoric acid, hot aluminum oxide, and hot ceramic are common dehydrating agents in these types of chemical reactions. Dehydration reactions in organic synthesis often result in the conversion of the reacting molecule from one type of compound to another, such as the conversion of alcohols to alkene.

The solution which liberates sulphur dioxide gas, from sodium sulphite :

chemistry nitrogen and sulfur sulfur and its oxides acid deposition natural resources- air, water and land

  1. Sodium hydroxide solution

  2. A weak acid

  3. Dilute sulphuric acid

  4. hydrochloric acid

Show answer
Correct Option: C
Explanation:
Sodium sulphite reacts with dilute sulphuric acid in the manner shown below:
$Na _2SO _3(s) + H _2SO _4(l) \rightarrow Na _2SO _4 + SO _2(g) + H _2O$ 
So, $SO _2$ is liberated as a product in the above reaction.

When sugar crystals are added to a hard glass test tube containing conc. sulphuric acid produce ____________.

chemistry nitrogen and sulfur sulfur and its oxides acid deposition natural resources- air, water and land

  1. brown carbon residue

  2. black carbon residue

  3. white carbon residue.

  4. none of these

Show answer
Correct Option: A
Explanation:

Sugar crystals burn in conc sulphuric acid producing brown carbon residue and smell of caramel carbon.

$ CH _3C \equiv CH \quad \xrightarrow [(HgSO _4]{Dil. H _2SO _4} (B) \xrightarrow [ (NaOH) ]{CHCl _3} (C) $compound (C) can be used as :

chemistry nitrogen and sulfur sulfur and its oxides acid deposition natural resources- air, water and land

  1. an anaesthetic

  2. an insecticide

  3. a solvent

  4. a hypnotic

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Correct Option: D

Sugar on treating with conc.${H} {2}{SO} _{4}$ produces a black mass. In this ${H} _{2}{SO} _{4}$ acts as a _________.

chemistry nitrogen and sulfur sulfur and its oxides acid deposition natural resources- air, water and land

  1. decarboxylating agent

  2. dehydrogenating agent

  3. dehydrating agent

  4. All the above

Show answer
Correct Option: C
Explanation:

The sulfuric acid is a dehydrating agent in the reaction that removes water from the sugar in a highly exothermic reaction, releasing heat, steam, and sulfur oxide fumes.

A dilute mineral acid, which forms a white precipitate when treated with barium chloride solution is :

chemistry nitrogen and sulfur sulfur and its oxides acid deposition natural resources- air, water and land

  1. Dilute nitric acid

  2. Dilute sulphuric acid

  3. Dilute hydrochloric acid

  4. none of these

Show answer
Correct Option: B
Explanation:

Dilute sulphuric acid is dilute mineral acid which forms a white precipitate when treated with barium chloride solution.

BaCl2 + H2SO4 ———— BaSO4 + HCl

In cities like Bombay and Calcultta, the major air pollutants is/are:

chemistry natural resources- air, water and land sulfur and its oxides acid deposition nitrogen and sulfur

  1. ozone

  2. carbon monoxide and oxides of sulphur

  3. hydrocarbons and not air

  4. algal spores and marsh gas

Show answer
Correct Option: B
Explanation:

Causes of air pollution in big cities are -
1. Burning of fossil fuels: Sulfur dioxide emitted from the combustion of fossil fuels like coal, petroleum and other factory combustibles is one the major cause of air pollution. carbon monoxide caused by improper or incomplete combustion and generally emitted from vehicles is another major pollutant along with nitrogen oxides, that is produced from both natural and man made processes.
2. Exhaust from factories and industries: Manufacturing industries release large amount of carbon monoxide, hydrocarbons, organic compounds, and chemicals into the air thereby depleting the quality of air. Manufacturing industries can be found at every corner of the earth and there is no area that has not been affected by it.


List-I List-ll
(A) $\mathrm{H} _{2}{S}\mathrm{O} _{4}$ 1 ) Antichlor
(B)Hypo 2) Bleaches by reduction
(C) $\mathrm{O} _{3}$  + $\mathrm{C} _{2}\mathrm{N} _{2}$ 3) Anti freeze
(D) moist $\mathrm{S}\mathrm{O} _{2}$ 4) Rocket fuel
5 ) Lead batteries

Which of the following is correct match?

chemistry nitrogen and sulfur sulfur and its oxides acid deposition natural resources- air, water and land

  1. (A)-4 , (B)-1 , (C)-3 , (D)-2

  2. (A)-5 , (B)-1 , (C)-4 , (D)-2

  3. (A)-2 , (B)-4 , (C)-5 , (D)-3

  4. (A)-1 , (B)-2 , (C)-4 , (D)-3

Show answer
Correct Option: B

State True or False.
Major sulphur dioxides production is through natural sources. 

chemistry nitrogen and sulfur sulfur and its oxides acid deposition natural resources- air, water and land

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

The given statement is False.
 Major sulphur dioxides production is through following chemical processes
(1) By burning sulphur
$\displaystyle S+O _2 \rightarrow SO _2 \uparrow$
(2) By roasting zinc blende or iron pyrites.
$\displaystyle 2ZnS + 3O _2  \rightarrow 2ZnO+2SO _2 \uparrow$
$\displaystyle 4FeS _2+11O _2  \rightarrow 2Fe _2O _3+8SO _2 \uparrow $
(3) By heating anhydrite (calcium sulphate), obtained from gypsum with arbon above 1000 deg C.
$\displaystyle 2CaSO _4+C \rightarrow 2CaO+2SO _2 \uparrow+CO _2$

Sinks can _____ excess amount of sulphur dioxide.

chemistry nitrogen and sulfur sulfur and its oxides acid deposition natural resources- air, water and land

  1. Produce

  2. Breakdown

  3. Absorb

  4. Melt

Show answer
Correct Option: C
Explanation:

Sources of $SO _2$ include fossil fuel combustion by industry, biomass burning, volcanic release and the oxidation of dimethylsulphide (DMS) from the oceans. Major SO2 sinks are oxidation by OH and deposition onto wet surfaces. Sinks are the areas that can absorb excess amounts thus reducing its abundance in the environment.