Gravity Separation

Q. Gravity separation method is based upon:

1. The preferential washing of ores and gangue particles
2. The difference in densities of ore particles and impurities
3. The difference in chemical properties of ore particles and impurities
4. None of these

Q. 25. Give reason: (A)white silver chloride turns grey in sunlight (B)why digestion is as decomposition reaction (B)why are the bags of Potato chips usually flushed with nitrogen gas (D)why does coppervessels lose their shine when exposed with air

Q. What will be the product if so2 reacts with cl2 1 in presence of charcoal 2 in absence of charcoal

Q.

During concentration of ore by froth flotation, the ore particles float on surface because:

A.)ore are insoluble

B.)sulphide ores are lighter

C.)the surface is not wetter by water

D.)difference in densities

Q. 30. Zn rod is placed in 100ml of 1m cuso4 solution so that molarity of cu2+ changes to 0.7 m . The molarity of SO4 2- at this stage will be

Q. CuSO4 solution is treated separately with KCl and KI. In which case Cu2+ will be reduced to Cu+

Q.

Froth floatation process is used for the concentration of

1. oxide ores

2. sulphide ores

3. chloride ores

4. amalgams

Q. The main function of froth stabilizer is to _____

1. stick to the ore and take it to the top
2. convert the insoluble ore into soluble part
3. reduces the surface tension of water​
4. none of the above

Q. [Ag(NH3)2][Ag(CN)2] NAMING?

Q. The process by which lighter earthy particles are freed from the heavier particles using water is:

1. Gravity separation
2. Magnetic separation
3. Leaching
4. All of the above

Q. Partial roasting done for cu ore to obtain copper matte is a method of reduction or concentration of ore?

Q. What will happen if Cu rod alone is dipped in cuso4 solution Reduction or oxidation of copper and Zn rod dipped in znso4 alone (cu and Zn rod are not connected)? If reduction then why not oxidation and vice versa?

Q. 50 g limestone react with 50% H2SO4 solution completely. What is the weight of H2SO4 required for the purpose ?

Q. ntEach of three metals x, y and z were put in turn into aqueous solution of the other two. x+ salt of y (or z)= y (or z) + salt of xn ntWhich one of the following observation is incorrectn nt1. y + salt of x=no action observedn nt2. y+ salt of z= z+ salt of yn nt3. z+ salt of x= x+ salt of zn nt4. z+ salt of y= no action observedn ntExplainn ntn

Q. Sand and sawdust can be separated by _________.

1. gravity separation
2. calcination
3. magnetic separation
4. none of these

Q. Which of the following process does not involve heating?

1. Calcination
2. Smelting
3. Roasting
4. Levigation

Q. Hydraulic separation method is used for the concentration of which ore?

1. Cassiterite
2. Haematite
3. Calamine
4. Galena

Q. 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

Q. Q 24/30 On addition of 1 ml of solution of 10% NaCl to100 ml of red gold sol in presence of 0.25 g of starch, thecoagulation is just prevented. The gold number of starch is

Q.

Gravity separation is also called __

Q. Give the principles of hydraulic washing.

Q. Hydraulic washing is based on the differences in:

1. special gravities of the ore and gangue particles
2. special viscosity of the ore and gangue particles
3. both $A$ and $B$
4. special density of the ore and gangue particles

Q.

Gravity separation is also called __

Q. The process of removing lighter gangue particles by washing in a current of water is called

1. liquation
2. leaching
3. levigation
4. cupellation

Q. Gravity separation process is used for the concentration of ________ .

Q.

what is meant by isolation

Q. Write the correct alternatives :
In the Wilfley table method, the particles of gangue are separated by...................separation method.

1. Magnetic
2. Froth floatation
3. Hydraulic
4. Gravitational

Q. Assertion :Levigation is used for the separation of oxide ores from impurities. Reason: Ore particles are removed by washing in a current of water.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. During the process of electrolytic refining of copper, metals that are present as impurities and settle as anode mud

1. Ag and Au
2. Pb an Zn
3. Sn and Ag
4. Fe and Ni

Q. Gravity separation method is based upon:

1. The preferential washing of ores and gangue particles
2. The difference in densities of ore particles and impurities
3. The difference in chemical properties of ore particles and impurities
4. None of these