Tag: physical properties of metals and non-metals

Questions Related to physical properties of metals and non-metals

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

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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.

Why iron is used widely in construction of buildings, bridges, railway lines etc?

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

  1. Iron is a good conductor of electricity

  2. Iron is ductile

  3. Iron have high tensile strength

  4. Iron is malleable

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Correct Option: C
Explanation:

Metals (except sodium, potassium) have very high tensile strength.
For example - iron can bear a lot of tensile strength. So, it is used in construction of buildings, bridges, railway lines etc.

Identity the element which can't conduct electricity:

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

  1. graphite

  2. iron

  3. phosphorus

  4. copper

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Correct Option: C
Explanation:

Phosphorus is a non-metal. It do not have free electrons for conduction. So, it is bad conductor of electricity.

The density of ice is $0.921\;g\ cm^{-3}$. Calculate the mass of a cubic block of ice which is $76\;mm$ on each side.

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

  1. $49 :g$

  2. $4\times 10^2\;g$

  3. $0.04 :g$

  4. $4\times 10^3\;g$

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Correct Option: B
Explanation:

Now, 1 $mm $ =   0.1 $cm$

$ \therefore $ 76$mm $ =   7.6 $cm$
Volume of cube $ =  $ $ (7.6)^3$ $ =  $ 438. 98 $ cm^3$
Now, mass $ =  $ density $ \times $ volume $ =  $ 0.921 $ \times $ 438.98 $ =  $ 404 $g$ $ =  $ $ 4.04 \times10^2 :g$

The mass of a piece of paper is $0.02\;g$ and the mass of a social substance and the piece of paper is $20.036\;g$. The volume of the solid substance is $2.16\;cm^3$. Calculate the density of the substance.

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

  1. $9.98$

  2. $7.36$

  3. $7.14$

  4. $9.268$

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Correct Option: D
Explanation:

Mass of piece of paper $=0.02\;g$


Mass of solid substance and piece of paper $=20.036\;g$

$\therefore$ Mass of solid substance $=20.036\;g-0.02\;g$

$\approx 20.02\;g$

Volume of solid $=2.16\;cm^3$

Density = $\dfrac{Mass}{Volume}=\dfrac{20.02}{2.16}=9.268 \ g/cm^3$

The mass of steel sphere having density 7850$\;kg :m^{-3}$ and radius 0.15$\;m$ is:

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

  1. 112$\;kg$.

  2. 290$\;kg$.

  3. 110.9$\;kg$.

  4. 300$\;kg$.

Show answer
Correct Option: C
Explanation:

Mass  of the sphere, $M = Density \times Volume$


Volume of the sphere is, $ V= \dfrac {4}{3} \pi r^3$


$ V=  \dfrac {4}{3} \pi (0.15)^3= 0.01412  \ m^{3} $

$M= 7850 \times 0.01412$

$= 110.9 \:kg$