Tag: physical properties of metals and non-metals

Questions Related to physical properties of metals and non-metals

The non-metal which is liquid at room temperature is:

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

  1. chlorine

  2. fluorine

  3. bromine

  4. iodine

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Correct Option: C
Explanation:

Bromine is the only non-metal which is liquid and diatomic molecule at room temperature. 

It is a dense, reddish-brown liquid evaporating at standard temperature and pressure to give an orange vapour. It is one of the only two elements on the periodic table that are liquids at room temperature other than mercury.

Hence, option $C$ is correct.

All non-metals are bad conductor of heat and electricity.

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:

Most of the non-metals are bad conductor of heat and electricity. But there are some non-metals which conduct electricity for example graphite. Due to presence of free electron in it.

Why are non-metals poor conductors of electricity?

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

  1. They have high melting point

  2. They vibrate at high speed

  3. They do not have free electrons

  4. All of above

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Correct Option: C
Explanation:

Non-metals are not dense enough and do not have enough free electrons to pass electricity efficiently. Electrons in non-metals are held tightly , they are no allowed to move freely .

Which of the following example is a poor conductor of electricity?

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

  1. Oxygen

  2. Aluminium

  3. Gold

  4. Silver

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Correct Option: A
Explanation:

Oxygen is a non-metal. Non-metals do not have enough free electrons to pass electricity. Electrons in non-metals are held tightly, they are not allowed to move freely .

State True or False.
Non-metals are good conductors of heat.

chemistry metals 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 are poor conductors of heat because non-metal compounds do not have a metallic structure, which benefits heat conduction.

State True or False.
Non-metals have lustre. 

chemistry metals 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 vary greatly in appearance. They do not have lustre. As it does not have any free electrons, light falling on non-metals does not reflect and hence non-metals are not shiny.

Why non-metals have a dull appearance?

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

  1. They have many free electrons

  2. They gain electrons easily

  3. They do not have lustre

  4. All of above

Show answer
Correct Option: C
Explanation:

Non-metals vary greatly in appearance. They do not have lustre. As it does not have any free electrons light falling on non-metals does not reflect and hence non-metals are not shiny. Hence, they have a very dull appearance.

Which of the following non-metal is hard yet brittle?

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

  1. Graphite

  2. Selenium

  3. Sulphur

  4. Diamond

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Correct Option: D
Explanation:

Diamond is the hardest substance known to man with a hardness of 10.0. It is brittle sometimes because it grows in diamond shape crystals, sometimes there are tiny cracks or flaws in the diamond and a hard strike against the crack of course will cause the diamond to crack into many pieces. Crystalline materials have planes of variable shear and normal strengths hence, they fail on fracture mechanism. Also, crystalline nature makes them extremely strong at surface resisting scratch.

Non-metals are:

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

  1. soft

  2. hard

  3. brittle

  4. all of above

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Correct Option: C
Explanation:

Non-metals are very brittle and cannot be rolled into wires or pounded into sheets. They break easily when hit by a hammer.

Which type of elements show brittleness?

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

  1. Metals

  2. Non-metals

  3. Metalloid

  4. None of the above

Show answer
Correct Option: B
Explanation:

Non-metal are neither malleable nor ductile. Non metals are brittle.