Chemistry · General Awareness

Chemistry of Metals and Alloys

1,762 Questions

Review the physical and chemical properties of various metals and their common alloys. This collection covers industrial applications, metallurgical processes, and practical uses of elements like silicon and boron. Practice these questions to strengthen your chemistry fundamentals for exams.

Properties of metalsCommon alloysIndustrial metallurgyChemical applications

Chemistry of Metals and Alloys Questions

Multiple choice chemistry reactivity series and electrochemistry reactivity series and displacement reactions chemical properties of metals chemical properties of metals and non metals

Name a metal from the activity series which displaces hydrogen from steam?

  1. Zinc

  2. Iron

  3. Copper

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

Magnesium can displace hydrogen from steam. Mg is better reducing agent than hydrogen as Mg les above hydrogen in the reactivity series.
Hence, the tendency for the reaction $\displaystyle Mg \rightarrow Mg^{2+} + 2e^-$ is greater than the tendency for the reaction $\displaystyle 2H^+ + 2e^- \rightarrow H _2$. Hence, Mg will be oxidised and $\displaystyle H^+$ will be reduced.

Multiple choice chemistry reactivity series and electrochemistry reactivity series and displacement reactions chemical properties of metals chemical properties of metals and non metals

Two metals lighter than water are:

  1. $Li,\ Na$
  2. $Al,\ Mn$
  3. $Pb,\ Mg$
  4. $Co,\ Mn$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$Li$ and $Na$ both metals belong to the alkali metals.


They are soft metals and have low ionization enthalpy,


Lithium is lighest elemental metal nearly half as dense as water, so if floats on the surface and ultimately diasppears, giving off hydrogen gas and forming a colourless solution of lothium hydroxide.

Sodium is also lighter than water nad have a density of $0.971 g/cm^3$,

hence, $Li$ and $Na$ both metals are lighter than water.


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

Multiple choice chemistry reactivity series and electrochemistry reactivity series and displacement reactions chemical properties of metals chemical properties of metals and non metals

Which of the following oxides can't be reduced by carbon?

  1. Sodium, magnesium, calcium, aluminium

  2. Sodium, potassium, tin, lead

  3. Both A and B

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

Carbon cannot reduce the oxides of sodium, magnesium, calcium, aluminium etc. to the respective metals. This is because these metals have more affinity for oxygen than carbon.

Multiple choice chemistry reactivity series and electrochemistry reactivity series and displacement reactions chemical properties of metals chemical properties of metals and non metals

Between copper and sodium, which metal is more reactive?

  1. Copper

  2. Sodium

  3. Both are equally reactive

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

Reactivity of metal depend on the formation of positive ions by losing electron. Sodium have more tendency to form positive ion than copper. Therefore sodium is more reactive than copper.

So option $B$ is correct

Multiple choice chemistry reactivity series and electrochemistry reactivity series and displacement reactions chemical properties of metals chemical properties of metals and non metals

In nature, metal $A$ is found in a free state while $B$ is found in the form of its compounds. Which will be near to the top of activity series of metals?

  1. $A$
  2. $B$

  3. Both A and B

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

The metals at the top of the activity series an so reactive that they are never found in nature as free elements.

Multiple choice chemistry reactivity series and electrochemistry reactivity series and displacement reactions chemical properties of metals chemical properties of metals and non metals

Metal at the top of reactivity series and metal at the bottom of the reactivity series are :

  1. potassium and gold respectively

  2. gold and potassium respectively

  3. sodium and silver respectively

  4. silver and sodium respectively
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Potassium is the most reactive metal so placed at the top in the reactivity series. Gold is least reactive so, placed at the bottom of reactivity series.

Multiple choice chemistry reactivity series and electrochemistry reactivity series and displacement reactions chemical properties of metals chemical properties of metals and non metals

Out of $Cu, Ag, Fe$ and $Zn$, the metal which can displace all others from their salt solution is:

  1. $Ag$
  2. $Cu$
  3. $Fe$
  4. $Zn$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This answer can be explained by Reduction potential values:

$Zn^{+2}+2e^- \longrightarrow Zn$  $[-0.76]$
$Ag^++e^- \longrightarrow Ag$         $[0.22]$
$Cu^++e^- \longrightarrow Cu$        $[0.52]$
$Fe^{+3}+e^- \longrightarrow Fe^{+2}$   $[0.77]$
As the reduction potential for $Zn$ is low it can replace that element from their compound state for which their reduction potential is above than that.

Multiple choice chemistry reactivity series and electrochemistry reactivity series and displacement reactions chemical properties of metals chemical properties of metals and non metals

Which one of the following four metals would be displaced from the solution of its salts by other three metals?

  1. $Mg$
  2. $Ag$
  3. $Zn$
  4. $Cu$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In a displacement reaction, a more reactive metal of the activity series can displace a less active one in its salt solution. Reactivity order is: 
$Mg> Zn> Cu> Ag.$
Thus, we see that Ag is least reactive and of the given four metals, Ag would be displaced from the solution of its salts by other three metals.

Multiple choice chemistry reactivity series and electrochemistry reactivity series and displacement reactions chemical properties of metals chemical properties of metals and non metals

Which of the following metals can displace the other three metals from their salt solutions?

  1. Iron

  2. Copper

  3. Zinc

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

Zinc is present above iron and copper in the activity series so it can displace both iron and copper from the salt solution. but question mention about other 3 so answer is none of these.

Multiple choice evs reflection of light by plane surfaces characteristics of an image formed by a plane mirror formation of image in a plane mirror characteristics of the image formed by a plane mirror

The silvering on the back surface of a mirror can be done by:

  1. Silver

  2. Mercury

  3. both

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

A plane mirror is made from a few mm thick glass plate. One surface of glass plate is polished to a high degree of smoothness. This forms the front part of the mirror. And the other (back) surface is silvered (i.e painted with silver, mercury or some other material).