Tag: chemistry

Questions Related to chemistry

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

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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. $PbI _2$

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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.

Density is defined as :

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

  1. ratio of mass and volume

  2. product of mass and volume

  3. ratio of volume and mass

  4. product of mass and temperature

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Correct Option: A
Explanation:

Density is a ratio of mass and volume.


 Density = $\dfrac{mass}{volume}$

Hence the option A is correct.

Which of the following metal is not sonorous at room temperature?

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

  1. Tungsten

  2. Aluminium

  3. Mercury

  4. Lead

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Correct Option: C
Explanation:

Mercury is the only metal that is liquid at room temperature. Its elasticity property is remarkably low. Hence, when struck it does not produce sound.

Why are metals lustrous?

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

  1. Light is transmitted through delocalized electrons

  2. They have a high boiling point

  3. Light is reflected through delocalized electrons

  4. Light does not travel through metals at all

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Correct Option: C
Explanation:

A metal is a lattice of metal "ions" in a "sea" of delocalised electrons - mobile electrons. Photons of light do not penetrate very far into the surface of a metal and are typically reflected, or bounced off, the metallic surface, by the mobile electrons and what you get is metallic reflection, which is lustrous.

Which of the following is the most sonorous metal?

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

  1. Gold

  2. Platinum

  3. Mercury

  4. Silver

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Correct Option: D
Explanation:

Silver has a very considerable elasticity. When struck it produces a very acute sound. Hence, it the most sonorous metal.

Which of the following example possess lustre?

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

  1. Silver

  2. Platinum

  3. Mercury

  4. All of above

Show answer
Correct Option: D
Explanation:

$A,\ B$ and $C$ are all metals with free electrons. Photons of light do not penetrate very far into the surface of a metal and are typically reflected or bounced off the metallic surface by the mobile electrons and what you get is a metallic reflection, which is lustrous.