Chemistry-
General
Easy

Question

.Extractionofaluminiumcanbeunderstoodby:

Electrolytic reduction of A l subscript 2 end subscript O subscript 3 end subscript
Electrolytic:( A l subscript 2 end subscript O subscript 3 end subscript +Cryolite+C a F subscript 2 end subscript)
Cathode: Carbon inside the Fe-container
Anode: Graphite rods
Thepurposeofaddingcryoliteis:</span

  1. Todecreasetheelectricalconductivityofpure aluminium    
  2. Tolower themeltingpointofA l subscript 2 end subscript O subscript 3 end subscript    
  3. Toremovetheimpuritiesasslag    
  4. ToincreasetheAl percentageintheyield    

The correct answer is: Tolower themeltingpointofA l subscript 2 end subscript O subscript 3 end subscript

Related Questions to study

General
chemistry-

Which of the followingisincorrectonthebasisoftheaboveEllinghamdiagramforcarbon?</span

Which of the followingisincorrectonthebasisoftheaboveEllinghamdiagramforcarbon?</span

chemistry-General
General
chemistry-

Carbon cannot be used to produce magnesium by chemicareduction of MgO because:

Carbon cannot be used to produce magnesium by chemicareduction of MgO because:

chemistry-General
General
chemistry-

incrementG° vsT plotinEllingham diagramslopesdownwardforthereaction:</span

incrementG° vsT plotinEllingham diagramslopesdownwardforthereaction:</span

chemistry-General
parallel
General
physics-

 In the above radioactive decay C is stable nucleus. Then:

 In the above radioactive decay C is stable nucleus. Then:

physics-General
General
physics-

Protons and singly ionized atoms of U to the power of 235 end exponent & U to the power of 238 end exponent are passed in turn (which means one after the other and not at the same time) through a velocity selector and then enter a uniform magnetic field. The protons describe semicircles of radius 10 mm. The separation between the ions of U to the power of 235 end exponent and U to the power of 238 end exponent after describing semicircle is given by

Protons and singly ionized atoms of U to the power of 235 end exponent & U to the power of 238 end exponent are passed in turn (which means one after the other and not at the same time) through a velocity selector and then enter a uniform magnetic field. The protons describe semicircles of radius 10 mm. The separation between the ions of U to the power of 235 end exponent and U to the power of 238 end exponent after describing semicircle is given by

physics-General
General
physics-

 The ratio of N subscript 1 end subscript to N subscript 2 end subscript when N subscript 2 end subscript is maximum is :

 The ratio of N subscript 1 end subscript to N subscript 2 end subscript when N subscript 2 end subscript is maximum is :

physics-General
parallel
General
physics-

Pertain to the statement and diagram below :

he figure given shows an energy level diagram for the hydrogen atom. Several transitions are marked as I,II,III, _. The diagram is only indicative and not to scale.
In which transition is a Balmer series photon absorbed ?

Pertain to the statement and diagram below :

he figure given shows an energy level diagram for the hydrogen atom. Several transitions are marked as I,II,III, _. The diagram is only indicative and not to scale.
In which transition is a Balmer series photon absorbed ?

physics-General
General
physics-

When an electron accelerated by potential difference U is bombarded on a specific metal, the emitted X-ray spectrum obtained is shown in adjoining graph. If the potential difference is reduced to U/3, the correct spectrum is

When an electron accelerated by potential difference U is bombarded on a specific metal, the emitted X-ray spectrum obtained is shown in adjoining graph. If the potential difference is reduced to U/3, the correct spectrum is

physics-General
General
physics-

In a historical experiment to determine Planck’s constant, a metal surface was irradiated with light of different wavelengths. The emitted photoelectron energies were measured by applying a stopping potential. The relevant data for the wavelength (mu) of incident light and the corresponding stopping potential (V subscript 0 end subscript ) are given below:

Given that c equals 3 cross times 108 m s to the power of negative 1 end exponent text  and  end text e equals 1.6 cross times 10 to the power of negative 19 end exponent C, Planck’s constant (in units of J s) found from such an experiment is

In a historical experiment to determine Planck’s constant, a metal surface was irradiated with light of different wavelengths. The emitted photoelectron energies were measured by applying a stopping potential. The relevant data for the wavelength (mu) of incident light and the corresponding stopping potential (V subscript 0 end subscript ) are given below:

Given that c equals 3 cross times 108 m s to the power of negative 1 end exponent text  and  end text e equals 1.6 cross times 10 to the power of negative 19 end exponent C, Planck’s constant (in units of J s) found from such an experiment is

physics-General
parallel
General
physics-

The graph between 1/lambda and stopping potential (V) of three metals having work functions ϕ subscript 1 end subscript comma ϕ subscript 2 end subscript and ϕ subscript 3 end subscript in an experiment of photo–electric effect is plotted as shown in the figure. Which of the following statement(s) is/are correct ? [Here lambda is the wavelength of the incident ray].

The graph between 1/lambda and stopping potential (V) of three metals having work functions ϕ subscript 1 end subscript comma ϕ subscript 2 end subscript and ϕ subscript 3 end subscript in an experiment of photo–electric effect is plotted as shown in the figure. Which of the following statement(s) is/are correct ? [Here lambda is the wavelength of the incident ray].

physics-General
General
physics-

The graph is showing the photocurrent with the applied voltage of a photoelectric effect experiment. Then

The graph is showing the photocurrent with the applied voltage of a photoelectric effect experiment. Then

physics-General
General
physics-

The diagram shows the energy levels for an electron in a certain atom. Which transition shown represents the emission of a photon with the most energy?

The diagram shows the energy levels for an electron in a certain atom. Which transition shown represents the emission of a photon with the most energy?

physics-General
parallel
General
physics-

The figure shows an energy level diagram for the hydrogen atom. Several transitions are marked as I,II,III, _______. The diagram is only indicative and not to scale.

In which transition is a Balmer series photon absorbed ?

The figure shows an energy level diagram for the hydrogen atom. Several transitions are marked as I,II,III, _______. The diagram is only indicative and not to scale.

In which transition is a Balmer series photon absorbed ?

physics-General
General
physics-

If lambda min is minimum wavelength produced in X-ray tube and lambdakalpha is the wavelength of kalpha line. As the operating tube voltage is increased.

If lambda min is minimum wavelength produced in X-ray tube and lambdakalpha is the wavelength of kalpha line. As the operating tube voltage is increased.

physics-General
General
physics-

Given curve shows the intensity-wavelength relations of X-rays coming from two different Coolidge tubes A and B. The dark curve represents the relation for the tube A in which the potential difference between the target and the filament is V subscript A end subscript and the atomic number of the target material is Z subscript A end subscript . Similarly dotted curve is for tube B. These quantities are V subscript B end subscript and Z subscript B end subscript for the

Given curve shows the intensity-wavelength relations of X-rays coming from two different Coolidge tubes A and B. The dark curve represents the relation for the tube A in which the potential difference between the target and the filament is V subscript A end subscript and the atomic number of the target material is Z subscript A end subscript . Similarly dotted curve is for tube B. These quantities are V subscript B end subscript and Z subscript B end subscript for the

physics-General
parallel

card img

With Turito Academy.

card img

With Turito Foundation.

card img

Get an Expert Advice From Turito.

Turito Academy

card img

With Turito Academy.

Test Prep

card img

With Turito Foundation.