ICSE ICSE Class 7 - CISCE Question Bank Solutions

Give two uses of Silicon  

Give two uses of Antimony   

 Give two uses of  Tungsten  

Give two uses of Germanium  

 Fill in the blank 

_________ is the hardest compound known to us 

Write ‘true’ or ‘false’ for the following statement. 

Antimony is a metal.

Write ‘true’ or ‘false’ for the following statement. 

Sand is an oxide of silicon. 

A metalloid used to make glass :

 A metalloid used in the manufacture of microchips used in computer is :  

Fill in the blank spaces by choosing the correct words from the given list.
List: amalgam, chlorine, gallium, sodium chloride, silver chloride 

Saline glucose is a solution of glucose and _______  

Tick (√) the correct answer.

The sulphate radical is written as S0₄^2-. What is the formula of calcium sulphate ?

Name the following radicals and give their valencies:

1. SO₄
2. CO₃
3. OH₄.
4.Cr₂O₇

The most ductile metal is _______.

Give the basic demarkation of the Modern Periodic Table into metals, metalloids and non-metals with special reference to halogens and noble gases.

Give a reason why the non-metals – halogens and noble gases are placed in separate groups of the periodic table with special reference to their difference in properties.

State what are metalloids.

Name the elements recognised as metalloids.

Compare the properties of metalloids with those of metals.

State the uses of three different metalloids.

State a specific reason for using steel in automobiles.