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Licemer1 [7]
2 years ago
5

Write the merits and demerits of Mendeleev periodic table in points and explain each of them in short​

Chemistry
1 answer:
elena-14-01-66 [18.8K]2 years ago
6 0

Answer:

merits of mendeleev periodic table are:

  1. it was first scientific and systamatic study of different element.
  2. there were may gaps for in discovered elements.After their discovery the got their proper place in table.
  3. with the help of mendeleev periodic table , properties of several elements were studied correctly.

demerits of mendeleev periodic table

  1. it could not arrange hydrogen as it shows the property of both alkali and halogens.
  2. it could not arrange isotopes because they have different atomic weight but same atomic number.
  3. it could not arrange Lanthanides and Actinides.

hope these points helped you

need more points then comment it .

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pH=pKa + log(conc. of base)/( conc. of acid)
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Which equation represents a redox reaction?
labwork [276]

Answer:

D. 2NaBr + Cl_2\rightarrow 2NaCl + Br_2

Explanation:

Hello!

In this case, for the given set of chemical reactions, it is possible to infer that D. is a categorized as redox due to the following:

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___AsCl3+____H2S--&gt;___As2S3+___HCI​
Alex17521 [72]

Answer:

2 AsCl₃ + 3 H₂S → As₂S₃ + 6 HCl

Explanation:

When we balance a chemical equation, what we are trying to do is to achieve the same number of atoms for each element on both sides of the arrow. On the right of the arrow is where we can find the products, while the reactants are found on the left of the arrow.

We usually balance O and H atoms last.

AsCl₃ + H₂S → As₂S₃ +HCl

<u>reactants</u>

As --- 1

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H --- 2

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<u>products</u>

As --- 2

Cl --- 1

H --- 1

S --- 3

2 AsCl₃ + H₂S → As₂S₃ +HCl

<u>reactants</u>

As --- 2

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H --- 2

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<u>products</u>

As --- 2

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H --- 1

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The number of As atoms is now balanced.

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<u>reactants</u>

As --- 2

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H --- 6

S --- 3

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As --- 2

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The number of S atoms is now equal on both sides.

2 AsCl₃ + 3 H₂S → As₂S₃ + 6 HCl

<u>reactants</u>

As --- 2

Cl --- 6

H --- 6

S --- 3

<u>products</u>

As --- 2

Cl --- 6

H --- 6

S --- 3

The equation is now balanced.

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Explanation:

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