ICSE ICSE Class 7 - CISCE Question Bank Solutions for Chemistry

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

Give two examples of the following:

Liquid + Liquid mixture:

State which element exists in the highest percentage in earth’s crust.

State which element exists in the highest percentage in atmosphere.

State which element exists in the highest percentage in human body.

Elements are mainly classified into metals and non-metals. State six properties of metals which differ from non-metals.