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

A solution of hydrogen chloride in water is prepared. The following substances are added to separate portions of the solution:

The questions (i) to (v) refer to the following salt solutions listed A to F:

1. Copper nitrate
2. Iron (II) sulphate
3. Iron (III) chloride
4. Lead nitrate
5. Magnesium sulphate
6. Zinc chloride

1. Which two solutions will give a white precipitate when treated with dilute hydrochloric acid followed by barium chloride solution?
2. Which two solutions will give a white precipitate when treated with dilute nitric acid followed by silver nitrate solution ?
3. Which solution will give a white precipitate, when either dilute hydrochloric acid or dilute sulphuric acid is added to it?
4. Which solution becomes a deep/inky blue colour when excess of ammonium hydroxide is added to it ?
5. Which solution gives a white precipitate with excess ammonium hydroxide solution?

How many atoms of each kind are present in the following molecules: calcium oxide, chlorine, water, carbon tetrachloride?

How many electrons are required by each atom mentioned in (a) to attain the nearest noble gas configuration?

How many atoms of each kind are present in the following molecules: calcium oxide, chlorine, water, carbon tetrachloride?

How many electrons are required by each atom mentioned in (a) to attain the nearest noble gas configuration?

How many atoms of each kind are present in the following molecule:

Calcium oxide

How many electrons are required or released by each atom in calcium oxide to attain the nearest noble gas configuration?

Elements X, Y, and Z have atomic numbers 6, 9 and 12 respectively. Which one forms a cation?

Elements X, Y, and Z have atomic numbers 6, 9 and 12 respectively. Which one :

State type of bond between Y and Z and give its molecular formula.

What do you understand by redox reactions? Explain oxidation and reduction in terms of loss or gain of electrons.

State the following is a reduction reaction or oxidation reaction.

\[\ce{Pb -> Pb^2+ + 2e-}\]

State the following is a reduction reaction or oxidation reaction.

\[\ce{Fe^2+ - e- -> Fe^3+}\]

State the following is a reduction reaction or oxidation reaction.

\[\ce{A^3+ + e- -> A^2+}\]

State the following is a reduction reaction or oxidation reaction.

\[\ce{Cu -> Cu^2+}\]

Answer the questions below relating your answers only to salts in the following list: Sodium chloride, anhydrous calcium chloride, copper sulphate-5-water?

1. What name is given to the water in the compound copper sulphate-5-water?
2. If copper sulphate-5-water is heated, anhydrous coppersulphate is formed. What is its colour?
3. By what means, other than healing, could you dehydrate copper sulphate-5-water and obtain anhydrous coppersulphate?
4. Which one of the salts in the given list is deliquescent?

Name the probable cation present based on the following observation:

White precipitate insoluble in NH₄OH but soluble in NaOH.

Name : 

a coloured metallic oxide which dissolves in alkalis to yield colourless solutions.

Colour of an aqueous solution of copper sulphate is ______.

Colour of the precipitate formed on adding NaOH solution to iron (II) sulphate solution is ______.

A metal which produces hydrogen on reacting with alkali as well as with acid.

Explain Why?

"When stating the volume of a gas, the pressure and temperature should also be given."