ICSE ICSE Class 7 - CISCE Question Bank Solutions

Statement given below is incorrect. Write the correct statement :

Potassium nitrate on strong heating decomposes into potassium nitrite and nitrogen gas.

Write ‘True’ or ‘False’ in front of following statement.

The catalyst used in laboratory preparation of oxygen gas from hydrogen peroxide gas is magnesium oxide

Write ‘True’ or ‘False’ in front of following statement.

Enamelling is the process of baking a mixture of silicates on the surface of aluminium at a high temperature.

Tick (√ ) the most appropriate answer.

Magnesium burns with a dazzling white flame to form magnesium oxide, a powdery mass. The colour of magnesium oxide is :

Write fully balanced equation for the following :

CO₂  +  H₂O  →

Write fully balanced equation for the following :

Ca(OH)₂  +  CO₂   →

Tabulate the various components of air, including the components with variable composition.

Compare the three main components of air i.e. nitrogen, oxygen and carbon dioxide with reference to their density and solubility, nature and reactivity.

Of the total volume of air – 4/5th is nitrogen. State the utility or consequence of this ratio.

State four different properties of a compound and a mixture.

Write the symbols of helium, silver, krypton, antimony, barium.

Write the names of following elements Na, C, Kr, U, Ra, Fe, Co.

Define: Elements-

Define: Compounds 

What do you understand by :

Noble gases

Select elements and compounds from the following list: Iron, plaster of paris, chalk, common salt, copper, aluminium, calcium oxide, cane sugar, carbon, silica, sodium sulphate, uranium, potassium carbonate, silver, carbon dioxide.

Give two examples of the following :

Solid + Solid mixture

On what principle are the following methods of separation based? Give one example of a mixture for each of the methods mentioned in which they are used

Magnetic separation

Write true or false

Milk is an emulsion.

Give two examples of the following:

Solid + Liquid mixture