Tag: uses of metals and non metals

Questions Related to uses of metals and non metals

Non metals are never used in cooking utensils because:

chemistry metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

  1. they are good conductor of heat

  2. they are bad conductor of heat

  3. they can't cook food properly

  4. they are not attractive

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Correct Option: B
Explanation:

Non-metals are poor conductor of heat. So, they can't be used for cooking utensils.  

Non-metals are poor conductors of heat, which are tend to:

chemistry metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

  1. be brittle

  2. conduct an electrical current

  3. have a shiny luster

  4. be malleable

  5. lose electrons

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Correct Option: A
Explanation:
Non metals tend to gain or share electrons when they react with other substances. 
They are poor conductors of heat and electricity. 
They are non-lustrous and have various colors. 
They are brittle and non-malleable hard or soft. 

Which is the lightest gas?

chemistry composition of matter physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

  1. ${N} _{2}$

  2. $He$

  3. ${O} _{2}$

  4. ${H} _{2}$

Show answer
Correct Option: D
Explanation:

Hydrogen and helium are the two lightest gasses,  they weigh so less that helium balloons and hydrogen dirigibles are able to float in the atmosphere.

______________ is the non-metal which conduct electricity.

chemistry metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

  1. Carbon

  2. Nitrogen

  3. Oxygen

  4. Sulphur

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Correct Option: A
Explanation:

Carbon is the non-metal which conduct electricity in the form of graphite which is it's allotrope. Allotropes are the compound of the element in which they have same chemical properties but different physical properties. 

The elements which partially conduct electricity are called as __________.

chemistry metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

  1. Conductors

  2. Insulators

  3. Semiconductors

  4. None of these

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Correct Option: C
Explanation:

Semiconductors are the elements which conduct electricity but in less quantity. Hence, they are called as semiconductors.

Non-metals do not show ductility due to absence of:

chemistry metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

  1. metallic bonds which allow one electron to slip over another

  2. covalent bonds which gives strength

  3. ionic bonds which gives makes it hard

  4. co-ordinate bonds which which gives extra stability

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Correct Option: A
Explanation:
Non-metals do not show ductility due to absence of metallic bonds which allow one electron to slip over another. High degrees of ductility in metals occur due to metallic bonds. In metallic bonds valence shell electrons are delocalized and shared between many atoms. The delocalized electrons allow metal atoms to slide over one another without being subjected to strong repulsive forces that would cause non-metals to shatter.

Generally, non-metals are not lustrous. Which of the following non-metal is lustrous?

chemistry metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

  1. Sulphur

  2. Oxygen

  3. Nitrogen

  4. Iodine

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Correct Option: D
Explanation:

Lustre means shine. Shining metals are also called lustrous metal. For example, gold. Non-metals such as sulphur, oxygen, nitrogen are non-lustrous but iodine is a greyish black solid and crystals have a metallic lustre.

Non metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.

The allotropic form of a non-metal, which is a good conductor of electricity is: 

chemistry metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

  1. Graphite

  2. Diamond

  3. Rhombic sulphur

  4. None of these

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Correct Option: A
Explanation:

Graphite, which is an allotrope of carbon, is a good conductor of electricity.

Boojho has learnt that non-metals on beating with a hammer are generally broken into pieces. Which of the following is a non-metal?

chemistry metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

  1. Iron nail

  2. Aluminium wire

  3. Copper plate

  4. Piece of coal

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Correct Option: D
Explanation:

All are metals in the given options iron, aluminium and copper but only carbon is a nonmetal present which is breakable with a hammer.

Non-metals have properties similar to that of metals.

chemistry composition of matter physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

  1. True

  2. False

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Correct Option: B
Explanation:

Non-metals have properties similar to that of metals , This  Statement is false because:

Properties of metals : 

Metals are solid at room temp. 
They are generally hard and strong. 
They have metallic lustre. 
They have high melting and boiling points. 
They are good conductors of heat and eletricity. 
Metals are sonorous. 
Most metals have high tensile strength. 
They are malleable. 
They are ductile. 
They have high densities. 


Properties for non-metals: 

Non-metals are glasses or solids at room temp. except bromine. 
They are not as hard as metals and have low tensile strengths. 
They do not have lusture. 
They are bad conductors of heat and electricity. 
Non-metals are brittle, they are neither malleable nor ductile. 
They usually have low densities. 
They have low melting and boiling points. 
They are non-sonorous.