Tag: physical properties of metals and non-metals

Questions Related to physical properties of metals and non-metals

The metallic lustre exhibited by sodium is explained by :

chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

  1. diffusion of sodium ions

  2. oscillation of mobile valence electrons

  3. existence of free protons

  4. existence of body centered cubic lattice

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Correct Option: B
Explanation:

Alkali metals are silver colored and their lustre tarnishes in air due to oxidation. Sodium has a distinctive flame colors because their outer $'s'$ electron is very easily excited.

Phosphorus is kept in:

chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

  1. kerosene oil

  2. alcohol

  3. water

  4. ammonia

Show answer
Correct Option: C
Explanation:

Phosphorus is a very reactive metal, when exposed to air it starts reacting vigorously, therefore it is kept in water.

Which of the following metals generally occur in liquid state at room temperature?

chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

  1. Mercury

  2. Bromine

  3. Gallium

  4. A and C both

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Correct Option: D
Explanation:

Mercury, bromine, gallium all exist in liquid state but bromine is non-metal.

Which of the following statement is not correct?

chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

  1. All metal are solids at room temperature.

  2. All metal are good conductors of heat and electricity.

  3. All metal form basic oxides.

  4. All metal possess lustre when freshly prepared.

Show answer
Correct Option: A
Explanation:

All metals are solid state at room temperature except mercury.Hence,it is incorrect.


All metal are good conductors of heat and electricity.

All metal form basic oxides.

All metal possess lustre when freshly prepared.

Hence, option $A$ is correct

Iron is tougher than sodium because:

chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

  1. iron atom is smaller.

  2. iron atom are more tightly packed.

  3. metallic bonds are stronger in iron.

  4. none of these.

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Correct Option: C
Explanation:

Iron is tougher than sodium because all metals have metallic bonding which is different from ionic or covalent bonding.In metallic bonding, the outer shells of adjacent atoms overlap and outer electrons are free to move through the lattice. Metal cations are balanced by electron anions.

Metallic lustre exhibited by sodium is due to:

chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

  1. diffusion of sodium ion

  2. oscillation of loose electron

  3. escalation of free protons

  4. existence of lattice structure

Show answer
Correct Option: B
Explanation:

The metallic lustre is because the excited $3s$ electrons of sodium emit a photon when they fall from $3p$ to $3s$ and the oscillation of electrons causes the metallic lustre.

Which of the following is the composition of red lead?

chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

  1. $PbO$

  2. $PbO _2$

  3. $Pb _3O _4$

  4. $PbI _2$

Show answer
Correct Option: C
Explanation:

Lead($II,IV$) oxide also called minium, red lead or triplumbic tetroxide is a bright red or orange crystalline or amorphous pigment. It is used in the manufacture of batteries,lead glass and rust proof primer paints.

Metals are lustrous in nature, having shiny appearance. Arrange the reasons given below in a sequence.
(a) Emission of radiation or light energy by excited electrons makes a metal shiny in appearance.
(b) The electrostatic forces of attraction between metal ions and the mobile electrons is called metallic bond.
(c) The positive metal ions are surrounded by pool of electrons.
(d) When light falls on the crystal, electrons get excited.

chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

  1. c b a d

  2. c b d a

  3. b c a d

  4. b d c a

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Correct Option: B
Explanation:

The correct sequence can be written as; c b d a.

The positive metal ions are surrounded by pool of electrons. The electrostatic forces of attraction between metal ions and the mobile electrons is called metallic bond. When light falls on the crystal, electrons get excited. Emission of radiation or light energy by excited electrons makes a metal shiny in appearance.

When Amrita was asked to pick up a few articles from a collection, she picked up the following:
A wooden scale, a glass test tube, and a paper basket.
Which article is she most likely to pick up next?

chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

  1. Steel cup

  2. Iron chain

  3. Rubber gloves

  4. Copper wire

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Correct Option: C
Explanation:

Wooden scale, glass test tube, paper basket are all non-metals and a poor conductor of electricity and Rubber gloves are similar to these.

Also if she is doing any lab work as Wooden scale, glass test tube, paper basket are usually component of carrying out some experiment then she would need a  Rubber gloves.

The property by virtue of which a substance can bear a lot of strain, without breaking is called tensile strength.

chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

  1. True

  2. False

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Correct Option: A
Explanation:

Tensile strength is a measurement of the force  required to pull something such as rope, wire or a structural beam to the point where it breaks.

The tensile strength of a material is the maximum amount of tensile stress that it can take before failure, for example breaking.