Selina solutions for Concise Chemistry [English] Class 7 ICSE chapter 6 - Metals and Non-metals [Latest edition]

 Name a metal that is most malleable  

 Name a metal that is brittle  

Name a metal as precious as gold  

 Name a metal that can be cut with knife   

Name a metal used in making electric cables 

Name a metal used as a thermometric liquid  

Name a metal that is the best conductor of electricity 

Name a non-metal that a good conductor of heat and electricity 

Name a non-metal that is hardest naturally occurring substance  

Name a non-metal that is used to kill germs in water 

Name a non-metal that is lustrous   

Name a non-metal that is used for filling into electric bulbs 

Name a non-metal that is used for cancer therapy 

Name a non-metal that is liquid at room temperature   

Mention two uses of the following metals and non-metals  

Iron 

Mention two uses of the following metals and non-metals 

Aluminium  

Mention two uses of the following metals and non-metals  

Gold 

Mention two uses of the following metals and non-metals 

Oxygen

Mention two uses of the following metals and non-metals 

Iodine    

Give reasons 

Magnesium is used in fire works. 

Give reasons  

Aluminium is used in making aircrafts.  

Give a reason:

Copper is used in making electric cables. 

Give reasons 

Graphite is used in the leads of pencils  

Give reasons 

Impure diamond is used to cut glass  

Give reasons 

Gold is mixed with copper and nickel.  

Give reasons 

Tungsten is used in electric bulbs. 

Name the metals present in the following alloys:

Brass

Name the metals present in the following alloys 

Bronze 

Name the metals present in the following alloys 

Duralumin 

Name the metals present in the following alloys  

Stainless steel   

Give four differences between metals and non-metals with reference to their:

1. Melting point and boiling point
2. The conductivity of heat and electricity
3. Malleability
4. Solubility 

What are metalloids? 

Give two uses of Silicon  

Give two uses of Antimony   

 Give two uses of  Tungsten  

Give two uses of Germanium  

The most ductile metal is _______.

 Fill in the blank: 

A metal stored in kerosene oil is _______

Fill in the blank 

Tungsten metal is a poor conductor of _______

Fill in the blank 

_______ is a soft metal. 

 Fill in the blank 

_________ is the hardest compound known to us 

Fill in the blank.

A non-metal used to purify water is ______.

Fill in the blank 

A metal that gives dazzling effect to crackers when they explode is ______

Fill in the blank 

A chemical compound that makes up the striking heads of match sticks is ______

Match the following:

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

Silver is used to make electric cables.

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

Iodine acts as an antiseptic in the form of a tincture of iodine. 

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

Sodium can be cut with a knife.  

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. 

The noble gas used in advertising signboards is 

A metal with melting point less than 50°C is

A metal which is neither ductile nor malleable is

 Rust is a hydrated oxide of iron which is

Aluminium is not used to make : 

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

A metalloid used to make glass :

Fill in the blank spaces by choosing the correct words from the given list. 

List: amalgam, chlorine, gallium, sodium chloride, silver chloride 

______ is a liquid metal. 

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

Salt of silver, such as ________ is used for making photographic films.

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

A solution of a metal in mercury is called ________

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

A gas used to sterilisation of drinking water 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 _______  

Statements given below are incorrect. Write the correct statements : 

Chlorine gas is used in the manufacture of sulphuric acid.  

Statements given below are incorrect. Write the correct statements : 

Bronze is a mixture of 10% copper, 80% zinc and 10% tin.  

Statements given below are incorrect. Write the correct statements : 

Soda water is prepared by dissolving washing soda in water.  

Statements given below are incorrect. Write the correct statements : 

Aluminium is best conductor of electricity.   

Statements given below are incorrect. Write the correct statements : 

Zinc is used for making power transmission wires.  

Match the statements in Column A, with those in Column B .

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

Stainless steel is used for making power transmission wires. 

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

Brass is an alloy of copper and zinc and has lustrous yellow colour. 

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

Graphite is used in making filaments of electric bulb.  

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

Magnesium is used in making light weight alloys of aluminium. 

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

Non-metals are poor conductors of electricity.     

Tick (√) the most appropriate answer.
Copper metal is used in :

Tick (√) the most appropriate answer. 

Sodium amalgam is prepared by dissolving sodium in :

Bronze is an alloy of ______.

Tick (√) the most appropriate answer. 

Graphite is used :

Tick (√) the most appropriate answer. 

A metal which is a poor conductor of electricity is:

 What do you understand by the term metal? 

State any five physical properties of a metal.
Physical properties of a metal : 

Name one metal which is a liquid at room temperature  

Name a metal which can be cut with a knife : 

Name a metal which is lighter than water : 

Name a metal which is not malleable : 

Name a metal which is best conductor of electricity :  

Name a metal which is poor conductor of electricity :   

State two important uses of following metal: 

Uses of gold  

State two important uses of following metal: 

Uses of silver  

State two important uses of following metal. 

Uses of copper  

State two important uses of following metals: 

Uses of iron   

State two important uses of following metal 

Uses of tin  

State two important uses of following metal: 

Uses of zinc  

State two important uses of following metal:

Uses of aluminium

State two important uses of following metal 

Uses of lead     

State two important uses of following metal 

Uses of magnesium  

State two important uses of following metal

Uses of mercury  

What do you understand by the term non-metal?  

State any five physical properties of a non-metal.

Name the non-metal and its natural form, which is the hardest substance.    

Name a non-metal which is liquid form at room temperature.

Name a non-metal which is good conductor of electricity.  

Name a gaseous non-metal,. having greenish yellow colour.  

Name a non-metal whose compounds help in the growth of plants.  

State two important uses of following non-metals  

Uses of nitrogen  

State two important uses of following non-metal 

Uses of oxygen  

State two important uses of following non-metal 

Uses of chlorine  

State two important uses of following non-metal

iodine

State two important uses of following non-metal 

Uses of graphite  

What are noble gases? Name all in the order of their increasing density.   

State one use  of helium  

State one use of argon    

What is an alloy? 

Why are alloys made?  

State the composition and two uses of given alloy:

Stainless steel

State the composition and two uses of given alloy:

Duralumin

State the composition and two uses of given alloy:  

Brass   

State the composition of given alloy: 

Bronze 

Write the uses of bronze alloy.

What is an amalgam? How does an amalgam different from an alloy?