Chemistry · Science General

Metallurgical Processes

1,436 Questions

This section explores key metallurgical processes including ore concentration, pyrometallurgy, and metal refining. It also covers corrosion and the properties of refractory materials. These chemistry questions are relevant for engineering and science entrance tests.

Pyrometallurgy furnacesMetal refining techniquesCorrosion protection methodsOre concentrationAuto reduction process

Metallurgical Processes Questions

Multiple choice

The blend is achieved by using:

  1. High frequency and galvanic current

  2. Alternating and high frequency current

  3. Alternating and sinusoidal current

  4. Galvanic and direct current
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The blend method of electrolysis combines high frequency (thermolysis) and galvanic (electrolysis) currents. This dual action provides both heat and chemical destruction to the hair follicle.

Multiple choice botany water absorption and ascent of sap in plants active transport and passive transport types of plant transport atp

The process by which minerals get absorbed is

  1. Active absorption

  2. Passive absorption

  3. Both A and B

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

The minerals are mainly absorbed by roots which are in direct contact with the soil. Absorption of water is known as water uptake. Short distance transport of water takes place from cell to cell  across the membranes involving physical processes such as diffusion, osmosis and water potential differences. Long distance transport involves complex processes such as root pressure and transpiration pull. transport There are two processes by which mineral absorption takes place:

1. There is rapid uptake of ions into the outer free surface passively down the gradient of electrochemical potential energy. 
2.  The movement of ions into the inner space requires the expenditure of energy and is called active uptake.
Thus, the correct answer is option C. 

Multiple choice chemistry separation of substances mixtures: examples and properties types of solutions all about mixtures

A salt is made by adding an excess of an insoluble metal oxide to an acid. How is the excess metal oxide removed from the mixture?

  1. chromatography

  2. crystallisation

  3. distillation

  4. filtration
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
$\text{Filtration is defined as the process of separating suspended solid matter from a liquid.}$$\text{ So it can be used to remove metal oxide from the mixture.}$
Multiple choice chemistry pure substances and mixtures: separation of mixtures mixtures: examples and properties types of solutions all about mixtures

Steel is a type of :

  1. Solid-liquid heterogeneous mixture

  2. Solid-solid heterogeneous mixture

  3. Solid-solid homogeneous mixture

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

Centrifugation is a technique which involves the application of centrifugal force to separated particles from a solution.Generally this is used in wasting machines to separated water particles from cloths during dry washing.

Multiple choice chemistry the s-block elements (alkali and alkaline earth metals) uses of alkali and alkaline earth metals uses of s block elements group 1 elements: alkali metals

At night when the lights of a scooter or a car fall on a road-sign or on a vehicle moving ahead, the painted letters or numbers shine with a glow. Which of the following is a luminous paint?

  1. Nickel-chrome alloy

  2. Barium sulphide

  3. Silver-plated metal

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Barium sulphide can be employed as a short wavelength emitter for electronic displays and used in electronics, paint pigments, flame retardant, luminous paints, and producing pure hydrogen sulphide.
Multiple choice chemistry changes around us can all changes be reversed? substances and objects classification of changes

 Iron adopts changes slowly and gradually by process of :

  1. rusting

  2. moldings

  3. fermentation

  4. explosions
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Iron adopt changes slowly and gradually when it comes in contact with air (moisture, oxygen etc)
When Iron reacts with $'n'$ molecules of water in the pressure of oxygen, it forms rust. Hence the process is known as a rusting.
$4Fe+3{ O } _{ 2 }+2n{ H } _{ 2 }O\longrightarrow 2{ Fe } _{ 2 }{ O } _{ 3 }.n{ H } _{ 2 }O$
Multiple choice chemistry changes around us can all changes be reversed? substances and objects classification of changes

Burnt sparklers and burnt books pages are examples of:

  1. reversible process

  2. irreversible process

  3. rusting

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Irreversible changes $-$ because when they are burnt formation of gas and ashes takes place i.e. chemical reaction is taking place and new substance are formed which can't be reversed back.


      Book pages  $\quad \xrightarrow { \text{burning} } \quad { CO } _{ 2 }+$ other substances.

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

Multiple choice eddy currents motional emf electromagnetic induction electromagnetic induction and alternating currents physics

Silicon steel used in lamination mainly reduces

  1. Hysteresis loss

  2. Eddy current losses

  3. Copper loss

  4. All of the above

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Silicon steel used in lamination mainly reducesHysteresis loss,Eddy current losses,Copper loss. In order to minimize the eddy currents more,magnetic core is laminated . The hysteresis coefficient of silicon steel is less, so hysteresis loss can be reduced. used mainly because of the following advantages: low hysteresis loss. low copper loss due to lower grain resistance.

Multiple choice eddy currents motional emf electromagnetic induction electromagnetic induction and alternating currents physics

Eddy currents are used in

  1. electrolysis

  2. making a galvanometer dead beat

  3. electroplating

  4. to increase the sensitivity of galvanometer
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In general the coil of galvanometer oscillates about it's equilibrium due to rotational inertia which consumes some time. To avoid this coils is bound over  a metallic frame or plate oscillates in a magnetic field the eddy currents generated in the frame or plate oppose the motion and bring the frame to rest as the oscillations die out quickly. This is known as making galvanometer dead beat. 

Multiple choice chemistry fluid pressure examples of hydraulic press applications of pascal's law pascal's law and its applications

The powdered ore is agitated with water or washed with running stream of water. The heavy ore particles and lighter impurities are separated. This method of concentration is known as:

  1. metallurgy

  2. leaching

  3. gravity separation

  4. forth floatation process
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • Hydraulic washing is based on the difference between specific gravities of the ore and the gangue particles. 
  • It is, therefore, a type of gravity separation. In one such process, an upward stream of running water is used to wash the powdered ore. 
  • The lighter gangue particles are washed away and the heavier ore particles are left behind.
Multiple choice chemistry fluid pressure examples of hydraulic press applications of pascal's law pascal's law and its applications

The method of concentration of the ore that makes use of difference in density between ore and impurities is called __________.

  1. levigation

  2. leaching

  3. magnetic separation

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

Levigation is based on the difference in densities of the metallic ore and gangue particles. Powdered ore is treated with a stream of running water when the lighter gangue particles are washed away and heavier ore particles are left behind.

Multiple choice chemistry fluid pressure examples of hydraulic press applications of pascal's law pascal's law and its applications

Hydraulic washing is based on the differences in ___________ of the ore and gangue particles.

  1. specific gravities

  2. mass

  3. type of material

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Hydraulic washing is a type of gravity separation, which is based on gravity differences between the ore and the gangue particles. In this process, the lighter gangue particles are washed away by a stream of water, leaving behind the heavier ore.

Multiple choice bio-chemistry biological oxidation classical idea of redox reactions oxidation reduction redox reaction

In the electrochemical series, metals are arranged in order of their tendency to :

  1. release halogens from their salts

  2. become reduced

  3. react with water

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

In the electrochemical series, metals are arrange in order of their tendency to lose electrons. 

$\bullet$ Oxidation potential increases down the group.(tendency to lose electron increases).
$\bullet$ Reduction potentials decreases down the group. (tendency to gain $e^-$ decreases).