Tag: physical properties of metals and non-metals

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

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

  1. chlorine

  2. fluorine

  3. bromine

  4. iodine
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

Why are non-metals poor conductors of electricity?

  1. They have high melting point

  2. They vibrate at high speed

  3. They do not have free electrons

  4. All of above
Reveal answer Fill a bubble to check yourself
C Correct answer
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 .

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

Why non-metals have a dull appearance?

  1. They have many free electrons

  2. They gain electrons easily

  3. They do not have lustre

  4. All of above
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

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

  1. Graphite

  2. Selenium

  3. Sulphur

  4. Diamond
Reveal answer Fill a bubble to check yourself
D Correct answer
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.