Tag: chemistry

Questions Related to chemistry

Non-metals do not have lustre which means:

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

  1. they do not have a shining surface

  2. they can't produce sound

  3. they can't conduct heat

  4. none of the above

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Correct Option: A
Explanation:

Non metals do not have  lustre which means that non-metals do not have a shining surface. That means they have a dull appearance.

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

Show answer
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

Show answer
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

Show answer
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

Show answer
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.