Tag: physical properties of 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
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.

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

Eventhough a cinema hall is a place prone to fire hazards, the interiors are mostly made of wood or wood based panels. Why is this so ?

  1. Wood does not catch fire easily

  2. Wood is opaque

  3. Wood can absorb sound

  4. Wood is very commonly available
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Wood is a good sound absorber. if it will be of some different material then there will be echo(a reflection of sound) in the hall and the sound will not be clear.

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

Most balloons, tyres and footballs are made-of rubber. This is because rubber is:

  1. naturally available

  2. cheap

  3. an electrical insulator

  4. soft and flexible
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Prior to rubber tires, metal and wood were the materials in use. However it was found that natural Rubber provides better cushioning, makes less noise. Further rubber deforms under weight /force which results in larger contact patch with the road than with metal/wood tires of same diameter/width. During cornering at high speeds, the deformation of sidewall and larger contact area improves the traction or grip on the road increasing safety.

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

Which of the following statements are true about metals?

  1. Valence band overlaps with conduction band.

  2. The gap between valence band and conduction band is negligible.

  3. The gap between valence band and conduction band cannot be determined.

  4. Valence band may remain partially filled.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Valence band overlaps with conduction band for the conductivity of metal.

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

What is the change in color when $ZnO$ is heated?

  1. Yellow

  2. Violet

  3. Green

  4. Blue
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Zinc Oxide is originally a white powder. When heated up, it turns yellow but does not decompose and when it is removed from the heat it gradually goes back to its original white colour.

Hence, option A is correct.
Multiple choice chemistry chemistry of non-metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

Metals are usually:

  1. good conductors of heat

  2. good conductors of electricity

  3. good elastic substances

  4. all of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Metals have these typical physical properties:
  • Lustrous (shiny)
  • Hard.
  • High density (are heavy for their size)
  • High tensile strength (resist being stretched)
  • High melting and boiling points.
  • Good conductors of heat and electricity.
  • Elastic materials