Chemistry Class 11 NCERT Solutions: Chapter 1 Some Basic Concepts of Chemistry Part 9

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Q: 25. How are

Sodium Carbonate is the disodium salt of carbonic acid with alkalinizing property

Structure of Na2CO3

Sodium Carbonate is the disodium salt of carbonic acid with alkalinizing property

Answer

Molar mass of

Now,

Hence, 0.50 mol of is present in of water or of is present in 1 L of water.

Q: 26. If ten volumes of dihydrogen gas react with five volumes of Dioxygen gas, how many volumes of water vapour would be produced?

This structure is two volumes of dihydrogen react with one volume of dihydrogen to produce two volumes of water vapour.

Structure of Hydrogen Oxygen and Water Molecule

This structure is two volumes of dihydrogen react with one volume of dihydrogen to produce two volumes of water vapour.

Answer

Reaction of dihydrogen with Dioxygen can be written as:

According to Gay Lussac’s law of gaseous volumes, 2 volume of dihydrogen react with 1 volume of O2O2 to produce 2 volume of water vapour. Therefore, 10 volume of dihydrogen on reaction with 5 volume of dioxygen will produce 10 volume of water vapour.

Q: 27. Convert the following into basic units:

(i)

(ii)

(iii)

Answer:

(i)

(ii)

(iii)

Since,

Q: 28 Which one of the following will have largest number of atoms?

(i)

(iii)

(iv)

Answer:

Hence, will have the largest number of atoms.

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