Tag: physical properties of metals and non-metals

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Multiple choice chemistry chemistry of non-metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

Most of the metals:

  1. are hard

  2. have lustre

  3. are good conductors of electricity

  4. all of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Metals have these typical physical properties:
  • Lustrous (shiny)
  • Hard
  • High density (are heavy for their size)
  • High tensile strength (resist being stretched)
  • High melting and boiling points.
  • Good conductors of heat and electricity. It can be followed that all of the above are correct
Multiple choice chemistry chemistry of non-metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

Why are metals solid in state?

  1. The atoms are attached by weak van der waals forces

  2. They gain electrons very easily

  3. They have a high boiling point

  4. They have a high intermolecular forces
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Most metals are solids because the intermolecular forces between the atoms of metals are quite large. This reduces the interstitial space and so they acquire a definite shape. Room temperature is not enough to provide them required kinetic energy to overcome their forces of attraction or convert its state. Thus, they remain solid at room temperature.

Multiple choice chemistry chemistry of non-metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

Greyish white metal which is a good conductor of electricity and heat , has a boiling point of $920^\circ C$ is :

  1. aluminium.

  2. tin.

  3. iron.

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

Greyish white metal which is a good conductor of electricity and heat and has a boiling point of $920^\circ C$ is zinc.


Hence, the correct option is $D$.


Multiple choice chemistry chemistry of non-metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

A bar of zinc generates a characteristic sound when bent, similar to_________.

  1. Tin cry

  2. Water splashing

  3. Glass breaking

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

A bar of zinc generates a characteristic sound when bent, similar to tin cry. A tin cry is the characteristic sound heard when a bar of tin is bent. Variously described as a "screaming" or "crackling" sound, the effect is caused by the crystal twinning in the metal.

Multiple choice chemistry chemistry of non-metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

Platinum metal can be dissolved in:

  1. hot conc. HCl
  2. hot conc. $HNO _3$
  3. hot dil. $H _2SO _4$
  4. a mixture of conc. HCl and $HNO _3$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • Traditional aqua regia is a mixture of concentrated nitric and hydrochloric acids in a ratio of 1:3 that can dissolve noble metals such as gold, platinum and palladium, even though the metals are not soluble in either acid alone.
  • Hence option D is correct answer.
Multiple choice chemistry chemistry of non-metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

The most reactive metal among the following is:

  1. Fe

  2. Pt

  3. Ni

  4. Co
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The reactivity series is sometimes quoted in the strict reverse order of standard electrode potentials, when it is also known as the "electrochemical series":

$Li > Cs > Rb > K > Ba > Sr > Na > Ca > Mg > Be > Al > H( water) > Mn > Zn > Cr > Fe > Cd > Co$
$ > Ni > Sn > Pb > H(in acids) > Cu > Fe(+3) > Hg > Ag > Pd > Ir > Pt > Au $

So, according to this series, Iron is most reactive than $Pt, Ni, Co$
Multiple choice chemistry chemistry of non-metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

Arrange $Si, Be, Mg, Na$ and $P$ in the increasing order of metallic character:

  1. $P<Be<Si<Mg<Na$
  2. $P<Si<Be<Mg<Na$
  3. $Si<P<Mg<Na<Be$
  4. $Na<Mg<Be<Si<P$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

metallic character increases down the group and decreases along the period as we move left to right. Hence the order of increasing metallic character is 

P to Na.

Multiple choice chemistry chemistry of non-metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

In vapour state a metal is mono atomic.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

There are no definitive chemical bonds between two metal atoms in a lattice. They all are held together by the so-called metallic bond. The valence electrons are not shared between metal atoms. Hence they exist as a single metal atom in their lattice unit. 

However we need to apply so much energy to convert it into vapour . And when these change to vapour then no any electron is shared between any metal atom and stay in monoatomic.
When the energy is lowered these again form lattices.