Tag: chemistry

Questions Related to chemistry

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 $x$?

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

  1. 9

  2. 10

  3. 11

  4. 8

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Correct Option: D
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.

The metal with the lowest density is :

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

  1. $Mg$

  2. $Li$

  3. $Ag$

  4. $Au$

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Correct Option: B
Explanation:

Under standard conditions, lithium is the lightest metal and the least dense solid element. It is a soft, silver-white metal belonging to the alkali metal group of chemical elements.

Which of the following metal is present in native state?

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

  1. platinum

  2. iron

  3. potassium

  4. copper

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Correct Option: A
Explanation:

Very few metals exist in the free or native state. Only metals like gold, platinum and mercury are occasionally found in the free state i.e in the pure form.

Metals tends to form:

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

  1. cations

  2. anions

  3. cations and anions

  4. do not form ions

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Correct Option: A
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 $\text{A}$

State True or False.
All metals are solids.

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: B
Explanation:

The given statement is false as mercury,gallium and caesium are liquids at room temperature. 

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

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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.

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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.