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 metals reaction of metals reactions of metals chemical properties of metals

Name the following: A metal which does not react with cold water but reacts with steam.

  1. Magnesium

  2. Iron

  3. Zinc

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Magnesium has almost no reaction with cold water. It reacts very slowly with hot water.  It reacts with steam when being heated and gives hydrogen gas and metal oxide.
Magnesium + Water $\rightarrow$  Magnesium hydroxide + Hydrogen gas
Zinc and iron do not react with cold or hot water.  They react with  steam slowly to give the respective oxides:
Zinc + Steam $\rightarrow$  Zinc oxide  + Hydrogen gas
Iron + Steam $\rightarrow$ Iron(II) iron(III) oxide  + Hydrogen gas

Multiple choice chemistry metals reaction of metals reactions of metals chemical properties of metals

Metals combine with oxygen to produce:

  1. neutral acid

  2. basic oxide

  3. acidic acid

  4. amphoteric oxide
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
An oxide that combines with water to give an acid is termed as an acidic oxide. The oxide that gives a base in water is known as a basic oxide.
Generally Group 1 and Group 2 metals  form bases called base anhydrides or basic oxides e.g.,
$4K+O _2 \rightarrow 2K _2O$
Basic oxides are the oxides of metals. If soluble in water, they react with water to produce hydroxides (alkalies) e.g.,
$K _2O(s)+H _2O(l) \rightarrow 2KOH(aq)$)

Multiple choice chemistry metals reaction of metals reactions of metals chemical properties of metals

Name one metal that will not react with cold water but will react with steam.

  1. Zinc

  2. Iron

  3. Calcium

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

Zinc is a metal which doesnot react with cold water but reacts with steam. The chemical equation for the reaction can be written as:
$ Zn + H _{2}O \rightarrow ZnO + H _{2}$
         (steam)

Multiple choice chemistry metals reaction of metals reactions of metals chemical properties of metals

Which one of the following metals do not react with cold as well as hot water?

  1. Na

  2. Ca

  3. Mg

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

The metal sodium, calcium and magnesium are highly reactive to water and make their hydroxides. 
Iron is a less reactive metal and does not show any reaction while treated with cold as well as hot water but will react with steam and form metal oxides and hydrogen gas.
$3Fe(s) +4H _2O(g) \rightarrow Fe _3O _4(s)+4H _2(g)$
  Iron         Steam          Iron(III) oxide   Hydrogen

Multiple choice physics electric current and its effects electric fuse electrical fuse and mcb fuse

A fuse wire is generally made of

  1. tin

  2. tin-lead alloy

  3. copper

  4. either (a) or (b) above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Fuse wire are used to save the home appliances from damagaing by large currents. so they are made up of such materials which have high resistance and low melting point so that they can melt down when unexpected amount of current is passed through.for this work either tin metal or tin-lead alloy will be appropriate. 

Multiple choice chemistry changes around us effects of oxidation reactions in daily life corrosion of metals electroplating and its application

Which metals does not corrode easily?

  1. Gold

  2. Iron

  3. Aluminium

  4. Zinc
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In the activity series, metals are on the top of the series react and corrode easily as these metals are highly reactive like iron corrodes easily in the presence of water and air forming its oxide layer while metals present at the bottom are least reactive and do not corrode easily like gold, silver and platinum are some of them.


Option $(A)$ is correct.

Multiple choice chemistry changes around us effects of oxidation reactions in daily life corrosion of metals electroplating and its application

A shiny brown-coloured element 'X' on heating in air becomes black in colour. Name the element 'X'?

  1. Sodium

  2. Calcium

  3. Copper

  4. Aluminium
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

'X' is copper (Cu) and the black-coloured compound formed is copper oxide(CuO). The equation of the reaction involved on heating copper is given below:

$\underset{(Shiny\,brown\,in\,colour)}{2Cu} + O _2 \overset{Heat}{\rightarrow} \underset{(Black\,in\,colour)}{2CuO}$

Multiple choice chemistry changes - physical and chemical effects of oxidation reactions in daily life corrosion of metals electroplating and its application

Which metal is protected by a layer of its own oxide?

  1. $Al$
  2. $Ag$
  3. $Au$
  4. $Fe$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Aluminium in air is ordinarily protected by a molecule-thin layer of its own oxide. This aluminium oxide layer serves as a protective barrier to the underlying aluminium itself and preventing chemical reactions with the metal.

Multiple choice thermodynamic principles of metallurgy general principles and processes of isolation of elements metallurgy chemistry

Which of the following metals can be used for sharp casting?

  1. Iron

  2. Copper

  3. Aluminium

  4. Silver
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Casting is a manufacturing process by which a liquid material is usually poured into a mold, which contains a hollow cavity of the desired shape, and then allowed to solidify. The solidified part is also known as a casting, which is ejected or broken out of the mold to complete the process. Iron is the best metal amongst the given options for sharp casting.