Tag: chemistry of non-metals

Quizzes (6) Questions (122)

Questions Related to chemistry of non-metals

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.

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

Metals have:

  1. high melting and boiling point

  2. low melting and boiling point

  3. high melting and low boiling point

  4. low melting and high boiling point
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

1) High melting and boiling point

2) Metallic bonding is the strong attraction between closely packed positive metal ions and a 'sea' of delocalised electrons.

3) The attraction between the metal ions and the delocalised electrons must be overcome to melt or to boil a metal.

4) These attractive forces are strong, so metals have high melting and boiling points.

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

Sodium and potassium  are soft even after being metals because of:

  1. strong intermolecular forces

  2. weak cohesive forces

  3. high melting point

  4. low boiling point
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hardness of a metal is determined by the strong cohesive forces between the atoms. The cohesive forces between atoms of these metals are very weak. The bonding in these metals is weak and electrons are not located over a single atom but over a number of atoms. The weak bonding results in softness of 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

A metal which is lighter than water is:

  1. lithium

  2. gold

  3. silver

  4. iron
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Lithium has a density of (0.534 g/cm3) which is lower than water (1 g/cm$^3$). Two other metallic elements are less dense than water. Potassium has a density of 0.862 g/cm$^3$ while sodium has a density of 0.971 g/cm$^3$. All of the other metals on the periodic table are denser than water. While lithium, potassium, and sodium are all light enough to float on water, they are also highly reactive.