Tag: general characteristics and uses of metals

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

Metallic lustre is explained by :

  1. oscillation of loose electrons

  2. diffusion of metal ions

  3. excitation of free protons

  4. existence of B.C.C. lattice
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The metallic lustre of a metal is due to the oscillation of loosely bound electrons.


When light falls upon the electrons, they absorb energy and are set into oscillation, and they emit radiations which are responsible for the metallic lustre.

Hence, te correct option is $\text{A}$

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

Which among the following elements is not lustrous?

  1. Cooper

  2. Gold

  3. Iron

  4. Iodine

  5. None of these
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Copper, gold, and iron are all metals with characteristic luster. Iodine is a non-metal that appears as shiny purple-black crystals but is not considered truly lustrous like metals. 'None of these' is correct because all the listed elements have some degree of luster, making the question poorly framed.

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

Arrange the following in increasing order of solubility in $H _2O$.


$AgCl,\  AgBr,\ AgI,\ AgF$

  1. $AgI < AgBr < AgCl < AgF$
  2. $AgI < AgBr < AgF < AgCl$
  3. $AgI < ACl < AgBr < AgF$

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Solubility in water depends on the size. Smaller is the size of the anion, more it is solvated and more is the solubility.


AgI < AgBr  < AgCl < AgF

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

Arrange the following in increasing order of solubility in $H _2O$?

$NaF, MgO, AlN$

  1. $AlN < MgO < NaF$
  2. $MgO < AIN < NaF$
  3. $AlN < NaF < MgO$

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

More the charge on the ions, more is the covalent character. Hence, the order of covalent charcter is $AlN  > MgO > NaF$. More is the covalent character, less is the solubility in water.

The order of solubility in water is $AlN < MgO < NaF$.

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

Choose the most elastic substance from the following option.

  1. Rubber

  2. Nylon

  3. Steel

  4. Iron
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Elasticity is the property of solid materials to return to their original shape and size after the forces deforming them have been removed.


Steel is more elastic than any other thing because steel comes back to its original shape faster than rubber when the deforming forces are removed.

Hence, option C is correct.

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

A piece of steel has a volume of 12 cm$^{3}$ and a mass of 96 g. Find its density in kg/m$^{3}$.

Density $= x \times 10^3\ kg/m^3$. What is the value of $x$?

  1. 9

  2. 10

  3. 11

  4. 8
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

We have, $1\ cm^3 = 10^{-6}\ m^3$


So, $12\ cm^3 = 12\times10^{-6} m^3$


Again, $1\ g = 10^{-3}\ kg$

So, $96 \ g = 96\times 10^{-3} \ kg$

Therefore, density $=\dfrac{mass}{volume}=\dfrac{96\times 10^{-3}}{12\times 10^{-6}} = 8\times 10^3\ kg/m^3$ 

 
 Hence option D is the correct answer.

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

Metals tends to form:

  1. cations

  2. anions

  3. cations and anions

  4. do not form ions
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Metals have low ionization enthalpy value and as a result of which they have a high tendency to donate the electrons and achieve inert configuration,

Because of their high electron-donating tendency, they are the strong reducing agent

$M \rightarrow M^{n+} + ne^-$

After the donation of electrons, metal gets a positive charge and the species having a positive charge are known as cations.

Hence, Metals tends to form cations.

Hence, te correct option is $\text{A}$