Tag: physical properties of non-metals

Quizzes (0) Questions (165)

Questions Related to physical properties of non-metals

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 are uses of sulphur?

  1. Sulphur is used in preparation of conducting wires

  2. A mixture of zinc and sulphur on heating with sulphur produces a greyish residue of zinc sulphide

  3. Sulphur is an element belonging to VI A group

  4. Sulphur is a nonmetallic element.
Reveal answer Fill a bubble to check yourself
B,C,D Correct answer
Explanation

Zinc on heating with sulphur produces a greyish residue of zinc sulphide.
Sulphur is an element belonging to VI A group.
Sulphur is a nonmetallic element.

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

Plastic sulfur has no sharp melting point.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Amorphous or plastic sulfur is produced by rapid cooling of molten sulfur e.g. by pouring it in cold water. It has helical form and metastable at room temperature reverting to its crystal allotrope and have sharp melting point.

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

State whether true or false :

Diamond and iodine are non-metals which are lustrous.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In case of iodine, the large size of the atom results in low shielding of valence electrons. 


Upon absorption of light or heat by these electrons, the de-excitation of the absorbed heat from the surrounding emit light so it appears that they have lustrous surface.


The sparkling shine of the diamond comes from its cut, clarity, refractive index and reflection. 

The natural diamonds found from the earth is dull and dim. Total internal reflection partially provides the brilliance and shine to the diamond. 

When light strikes the diamond, it gets refracted and get separated into individuals colors. Diamonds normally have high refractive index thus providing a brilliant shine to the diamond.

Therefore Diamond , graphite & iodine are nonmetals which are lustrous because of their crystal structure.

Therefore, option A is correct.

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

Compare the physical properties of metals and non-metals in general with reference to melting point.

  1. Both have low melting point

  2. Both have high melting point

  3. Metals have low melting point while non-metals have high melting point

  4. Metals have high melting point and non-metals have low melting point
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Metals have high melting and boiling point. Tungsten has the highest melting point where as silver has low boiling point. Sodium and potassium have low melting points. Non metals have low melting point.

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

Diamond and graphite are good conductors of electricity.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Graphite is able to conduct electricity, due to delocalization of the pi bond electrons above and below the planes of the carbon atoms. These electrons are free to move, so are able to conduct electricity.
In diamond, all four outer electrons of each carbon atom are 'localized' between the atoms in covalent bonding. The movement of electrons is restricted and diamond does not conduct an electric current.
Thus, graphite is a good conductor and diamond is not. 
Option "B" is correct.

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 is a good conductor of electricity?

  1. Diamond

  2. Graphite

  3. Both A and B

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Diamond and graphite are allotropes of carbon. Graphite has carbon molecules held together by weak van der Waal's forces of attraction and they have loosely bound electrons which are responsible for conducting electricity, while diamond is the hardest and strongest material in which all the molecules are bound by strong bonding between carbon tetrahedrons held by strong forces of attraction and so, they do not have free or loosely bound electrons to conduct electricity.

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

By dropping a drop of water on a glowing electric bulb, it bursts. This is because glass is a _________.

  1. good conductor of heat

  2. bad conductor of heat

  3. transparent substance

  4. good conductor of electricity
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

1) The glass is actually an insulator. 

2) It doesn't allow the flow of electrons easily from atom to atom, as seen in substances like copper, and other metals which are excellent conductors of both heat and electricity. 

3) Insulators have electrons that are held tightly which means they aren't shared between other atoms.

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

Which of the following is a property of nonmetals?

  1. Low densities

  2. Low melting points

  3. Poor conductor of electricity

  4. All the three
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Non metals are poor conductor of electricity, low densities, low melting points, non lustrous, brittle in nature, non ductile and not malleable in nature.
So, answer is D.
Multiple choice chemistry composition of matter physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

Which of the following are properties of non-metals?

  1. Low melting point

  2. Poor conductor of electricity

  3. Low densities

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Common Properties of non-metals-
  • High ionization energies.
  • High electronegativities.
  • Poor thermal conductors.
  • Poor electrical conductors.
  • Brittle solids - not malleable  or ductile.
  • Little or no metallic lustre.
  • Gain electrons easily.
  • Dull, not metallic-shiny, although they may be colorful.
  • Low melting point and densities.
  • Lower melting points and boiling point than the metals.
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 having shining surface is:

  1. sulphur

  2. phosphorus

  3. iodine

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

It's because going down the group the size of the atom increases because of the shielding effect due to which the interaction between the atom and the outermost electron decreases.

 So these electrons on the surface of iodine become excited by absorbing heat energy from light. so when they release this energy and come to their normal state, they emit this light so it appears that they have a shining surface.

So, the correct option is $C$