Tag: chemistry

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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

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 $\text{A}$

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

The metallic lustre exhibited by sodium is explained by :

  1. diffusion of sodium ions

  2. oscillation of mobile valence electrons

  3. existence of free protons

  4. existence of body centered cubic lattice
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

Which of the following statement is not correct?

  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.
Reveal answer Fill a bubble to check yourself
A Correct answer
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

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

Iron is tougher than sodium because:

  1. iron atom is smaller.

  2. iron atom are more tightly packed.

  3. metallic bonds are stronger in iron.

  4. none of these.
Reveal answer Fill a bubble to check yourself
C Correct answer
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.