(English Medium) ICSE Class 10 - CISCE Question Bank Solutions

You are given three white powders-calcium carbonate, lead carbonate and zinc carbonate. Describe the tests you would carry out in solution, to identify the metal ion in each of the above compounds. Indicate clearly how you would prepare the solutions for the tests.

Sodium hydroxide solution can be used to distinguish between i. iron (II) sulphate solution and (ii) iron (III) sulphate solution; because these solutions give different coloured precipitates with sodium hydroxide solution. Give the colour of the precipitate formed with each of the solution.

What will you observe when barium chloride solution is added to iron(II) sulphate solution.

How will the action of dilute hydrochloric acid on sodium carbonate and sodium sulphite enables you to distinguish between these two compounds?

Sodium hydroxide solution is added first in a small quantity, then in excess to the aqueous salt solutions of copper (II) sulphate, zinc nitrate, lead nitrate, calcium chloride and iron (III) sulphate. Copy the following table and write the colour of the precipitate in (i) to (v) and the nature of the precipiatate (soluble or insoluble) in (vi) to (x)

The questions (i) to (v) refer to the following salt solutions listed A to F :
A. Copper nitrate
B. Iron (II) sulphate
C. Iron (III) chloride
D. Lead nitrate
E. Magnesium sulphate
F. Zinc chloride
(i) Which two solutions will give a white precipitate when treated with dilute hydrochloric acid followed by barium chloride solution/
(ii) Which two solutions will give a white precipitate when treated with dilute nitric acid followed by silver nitrate solution?
(iii) Which solution will give a white precipitate when either dilute hydrochloric acid or dilute sulphuric acid is added to it?
(iv) Which solution becomes a deep/inky blue colour when excess of ammonium hydroxide is added to it?
(v) Which solution gives a white precipitate with excess ammonium hydroxide?

Give one chemical test to distinguish between the following pair of compounds:

Zinc sulphate solution and Zinc chloride solution

Give one chemical test to distinguish between the following pair of compounds:

Iron (II) chloride solution and iron (III) chloride solution

Prove the Following :
One mole of any gas contains th e same number of molecules.

The relative atomic mass of Cl atom is 35.5 a.m.u. Explain this statement.

What is the value of Avogadro's number?

Define the term.

Molar volume

Define the term Relative atomic mass.

Define the term: 

Avogadro’s number

Explain the term: 

Gram atom

Explain the term:

Gram mole

Explain the term: 

Mole

What do you understand by the term mole? How many elementary units are in one mole of a substance?

Fill in the blank
One gram atom of an element contains ______ atoms.

Fill in the blank.
One a.m.u. is the mass of ______ atom of C^₁₂.