Tag: acid deposition

Questions Related to acid deposition

Select the correct statement (S).

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

  1. p- chlorometaxylenol and dichlorometaxylenol are antibacterials and deodorants

  2. BHT and BHA are food antioxidants

  3. $SO _2$ and $SO _3^{-2}$ are antioxidants for wine and beers

  4. All of the above are correct statements

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Correct Option: D
Explanation:
(A) p-chlorometaxylenol & dichlorometaxylenol are antibacterials & deodrants as they are most effective against gram positive bacteris.
(B) BHA & BHT are antioxidants as oxygen reacts preferentially with BHA or BHT rather than oxidising fats or oils thereby protecting them from spoilage.
(C) $SO _{2} $ & $ SO _{3}^{2-}$ are used as preservative because of antioxidative & antimicrobial properties.

Which of the following acts as pickling agent?

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

  1. $\displaystyle\;HNO _3$

  2. $\displaystyle\;HCl$

  3. $\displaystyle\;H _2SO _4$

  4. $\displaystyle\;HNO _2$

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Correct Option: C
Explanation:

Pickling is a metal surface treatment i.e; used to remove impurities such as strains, inorganic contaminants on the surface of the metal. So to remove this pickling liquor containing acid is used. 

$H _2SO _4$ is used as pickling agent because of its high oxidizing power, for which it can dissolve noble metals as well.

$1000L$ of air at STP was dissolved in water and required $2.5\times { 10 }^{ -5 }$ moles of $KMn{ O } _{ 4 }$ for complete reaction of ${SO} _{2}$ at pollutants. Thus, ${SO} _{2}$ content in air is :

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

  1. $1.4ppm$

  2. $14ppm$

  3. $2.8ppm$

  4. $6.25ppm$

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Correct Option: A

A solution of chromium oxide in concentrated sulphuric acid is used for cleaning glass in laboratories because it:

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

  1. Removes sand particles

  2. Oxidises grease

  3. Dissolves glass

  4. Reacts with dust

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Correct Option: B
Explanation:

Because a solution of chromium oxide in sulfuric acid (also known as a sulfochromic mixture or chromosulfuric acid) is a powerful oxidizing agent, it can be used to clean laboratory glassware, particularly of otherwise insoluble organic residues.They oxidize the grease present on the glass surfaces and hence thus it can be cleaned.