Tag: chemistry

Questions Related to chemistry

Iron nails rust fast when used for fixing plates or strips of aluminium on a building. Similarly, a water pipe made of iron corrodes faster when connected to a pipe of copper. This happens because of the?

chemistry changes around us effects of oxidation reactions in daily life corrosion of metals electroplating and its application

  1. Greater wetting of iron

  2. Easier flow of electrons to iron

  3. Higher rusting power of iron

  4. Chemical reduction of iron

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Correct Option: C
Explanation:

This is due to higher rusting power of iron.

When iron pipe is connected to copper corrosion is caused by self induced current created. The current is generated due to difference in electrical potential. The water act as a weak electrolyte.

The presence of $CO _2$ in the atmosphere results in:

chemistry changes around us effects of oxidation reactions in daily life corrosion of metals electroplating and its application

  1. rusting.

  2. dusting.

  3. electroplating.

  4. freezing.

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Correct Option: A
Explanation:

The presence of $CO _2$ in the atmosphere will do iron oxide rusting. When a drop of water hits an iron object, two things begin to happen almost immediately. 

First, the water, a good electrolyte, combines with carbon dioxide in the air to form a weak carbonic acid, an even better electrolyte. As the acid is formed and the iron dissolved, some of the water will begin to break down into its component pieces - hydrogen and oxygen. 
The free oxygen and dissolved iron bond into iron oxide, in the process freeing electrons.

The tarnishing of silver ornaments in atmosphere is due to:

chemistry changes - physical and chemical effects of oxidation reactions in daily life corrosion of metals electroplating and its application

  1. $Ag _{2}O$

  2. $Ag _{2}S$

  3. $Ag _{2}CO _{3}$

  4. $Ag _{2}SO _{4}$

Show answer
Correct Option: A,B
Explanation:

The tarnishing of silver ornaments in atmosphere is due to formation of silver oxide $Ag _{2}O$ and silver sulphide $Ag _{2}S$.

$2Ag\, +\, \displaystyle 
\frac{1}{2}{O _{2}}\, \rightarrow\, Ag _{2}O$

$2Ag\, +\, H _{2}S\, \rightarrow\, Ag _{2}S\, +\, H _{2}$

Hence, option A and B are correct.

Which metal is protected by a layer of its own oxide?

chemistry changes - physical and chemical effects of oxidation reactions in daily life corrosion of metals electroplating and its application

  1. $Al$

  2. $Ag$

  3. $Au$

  4. $Fe$

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Correct Option: A
Explanation:

Aluminium in air is ordinarily protected by a molecule-thin layer of its own oxide. This aluminium oxide layer serves as a protective barrier to the underlying aluminium itself and preventing chemical reactions with the metal.

Zinc corrodes in ____________________.

chemistry chemical reactions and equations effects of oxidation reactions in daily life corrosion of metals electroplating and its application

  1. 2 $M$ alkaline solution

  2. 2 $M$ acid solution

  3. 2 $M$ neutral salt solution

  4. all of the above

Show answer
Correct Option: B
Explanation:

Corrosion requires acidic medium. Hence zinc corrodes in 2 $M$ acid solution.


Hence, option B is correct.

Rusting of iron is catalysed by which of the following:

chemistry changes - physical and chemical effects of oxidation reactions in daily life corrosion of metals electroplating and its application

  1. $Fe$

  2. $Zn$

  3. O$ _{2}$

  4. $H^{+}$

Show answer
Correct Option: D
Explanation:

The rusting or iron occurs in acidic medium. Hence it is catalyzed by $ { H }^{ + } $ ions.

Hence, correct option is D.

Which soil is red in colour?

chemistry soil- our life the soil soil erosion (geo) soil erosion, soil conservation and uses of soil

  1. Multani soil

  2. Shadu soil

  3. Terracotta soil

  4. Kaolin (china clay)

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Correct Option: C
Explanation:

Terracotta soil is red in colour.
Kaolin (china clay)  is white in colour.
Shadu soil is whitish in colour.

In which of the following soil the ratio of large particles are high?

chemistry soil- our life the soil soil erosion (geo) soil erosion, soil conservation and uses of soil

  1. Clayey soil

  2. Sandy soil

  3. Muddy soil

  4. None of the above

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Correct Option: B
Explanation:

In sandy soil, the ratio of large particles are high as the sand is the large particle in soil than the clay and slit. So in sandy soil sand particles are more
Hence option B is correct.

Which of the following characteristic property of clay soil make it useful to grow plants?

chemistry soil- our life the soil soil erosion (geo) soil erosion, soil conservation and uses of soil

  1. Retain water and moisture

  2. Do not retain water and moisture

  3. Holds lot of sand

  4. None of the above

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Correct Option: A
Explanation:

The particles size is very tiny and they are compact thereby retaining water and moisture, which helps the plants to grow well.

What is the nature of normal rain water?

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

  1. Neutral

  2. Acidic

  3. Basic

  4. None

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Correct Option: B
Explanation:

Normal rain water is slightly acidic (pH is 5-6)