Tag: physical properties of metals and non-metals

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

Which characteristics are required for a element to behave as electrical conductor?

  1. It should have valence electron

  2. It should have free electron

  3. It easily provide electron to other element
  4. Both $B$ and $C$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Electrical conductors elements have free electrons, which they can easily provide to conduct electricity. This characteristics are generally available in metals.

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

Which allotrope of carbon do not conduct electricity?

  1. Graphite

  2. Diamond

  3. Fullerene

  4. Both b and c
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Carbon is a non-metal which have allotropic form that is graphite, diamond and fullerene. Out of this three only graphite is conductor of electricity. Diamond and fullerene do not conduct electricity.

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

Non-metals are brittle while metals are ductile. Why?

  1. Because of lesser extent of bonding in non-metals

  2. Because of greater extent of bonding in non-metals

  3. Because of smaller size of non-metallic atoms

  4. Because of lower conductivity of non-metals
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The basic difference between metals and non-metals is the extent of bonding.Metals have very high extent of bonding than that in non-metals which makes the metal malleable. and non-metals brittle.

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 among the following non-metal is liquid at room temperature?

  1. Chlorine

  2. Bromine

  3. Mercury

  4. Phosphorous
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Mercury and bromine both are present in liquid state at room temperature but mercury is metal and bromine is non-metal.

So, liquid non-metal at room temperature is bromine.

Multiple choice chemistry composition of matter physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals
Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured. The non-metal which is known to form the largest number of compounds is:

  1. carbon

  2. sulphur

  3. nitrogen

  4. chlorine
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Carbon is a non-metal and is  known to form the largest number of compounds due to two reasons:

  1. Catenation - The ability of carbon to form bonds with the atoms of itself resulting in the large chains and rings of carbon. It causes large no. of chain and ring compounds.
  2. Tetravalency - Due to tetravalency, carbon can form bonds with other tetravalent elements and monovalent elements like hydrogen, chlorine, bromine etc.

Hence, option A 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 element is not in the liquid state at room temperature?

  1. $Hg$
  2. $Li$
  3. $Ga$
  4. $Br$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Bromine and mercury are metal which is liquid at room temperature. Gallium a brittle solid at low temperatures, and a liquid at temperatures greater than $29.76^o C$ (slightly above room temperature).Thus gallium is liquid at room temperature.
Bromine is a liquid because electrons are well apart from the nuclei so they are easily distorted .Intermediate intermolecular forces exists and thus it is in liquid state.
 Lithium  is a solid at room temperature.
Multiple choice chemistry materials: metals and non-metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

The metallic character of elements ............. in a group from top to bottom.

  1. Increases

  2. Decreases

  3. remains constant

  4. shows indefinite behaviour
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

As you move down a group in the periodic table, the atomic size increases and the valence electrons are further from the nucleus, making them easier to lose, which increases metallic character.