Physics-
General
Easy

Question

A ball connected with string is released at an angle 45° with the vertical as shown in figure. Then the acceleration of the box at this instant will be: [Mass of the box is equal to mass of ball]

  1. g/4    
  2. g/3    
  3. g/2    
  4. none of these    

The correct answer is: g/3

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Two masses m and M are attached to the strings as shown in the figure. If the system is in equilibrium, then

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A block of mass M on a horizontal smooth surface is pulled by a load of mass M/2 by means of a rope AB and string BC as shown in the figure. The length & mass of the rope AB are L and M/2 respectively. As the block is pulled from AB = L to AB = 0 its acceleration changes from

A block of mass M on a horizontal smooth surface is pulled by a load of mass M/2 by means of a rope AB and string BC as shown in the figure. The length & mass of the rope AB are L and M/2 respectively. As the block is pulled from AB = L to AB = 0 its acceleration changes from

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Block of 1 kg is initially in equilibrium and is hanging by two identical springs A and B as shown in figures. If spring A is cut from lower point at t=0 then, find acceleration of block in m s to the power of negative 2 end exponent at t = 0

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Find the acceleration of 3 kg mass when acceleration of 2 kg mass is 2 blank m s to the power of negative 2 end exponent as shown in figure

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Both the blocks shown here are of mass m and are moving with constant velocity in direction shown in a resistive medium which exerts equal constant force on both blocks in direction opposite to the velocity. The tension in the string connecting both of them will be : (Neglect friction)

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Metallic gold frequently is found in aluminosilicate rocks and its is finely dispersed among other minerals. It may be extracted by trating the crushed rock with aerated potassium cyanide solution. During this process metallic gold is slowly converted to [Au(CN)2 ] , which is soluble in water. After equilibrium has been reached, the aqueous phase is pumped off and the metallic gold is recovered from it by reacting the gold complex with zinc, which is converted to [Zn(CN)4 ] 2–. Gold in nature is frequently alloyed with silver which is also oxidised by aerated sodium cyanide solution. Silver occurs as native as well as sulphurised ore.
The correct reaction involved in the leaching of gold with dilute solution of NaCN is :

Metallic gold frequently is found in aluminosilicate rocks and its is finely dispersed among other minerals. It may be extracted by trating the crushed rock with aerated potassium cyanide solution. During this process metallic gold is slowly converted to [Au(CN)2 ] , which is soluble in water. After equilibrium has been reached, the aqueous phase is pumped off and the metallic gold is recovered from it by reacting the gold complex with zinc, which is converted to [Zn(CN)4 ] 2–. Gold in nature is frequently alloyed with silver which is also oxidised by aerated sodium cyanide solution. Silver occurs as native as well as sulphurised ore.
The correct reaction involved in the leaching of gold with dilute solution of NaCN is :

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Minerals from which metals can be extracted economically and easily are called ores. The extraction of metals from theirs ores involves the following processes.
i) Concentration
ii) Calcination | roasting | leaching
iii) Reduction It is carried out by one of the following methods.

Minerals from which metals can be extracted economically and easily are called ores. The extraction of metals from theirs ores involves the following processes.
i) Concentration
ii) Calcination | roasting | leaching
iii) Reduction It is carried out by one of the following methods.

chemistry-General
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The chemical composition of “slag” formed during the smelting process in the extraction of copper is :

The chemical composition of “slag” formed during the smelting process in the extraction of copper is :

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Native silver metal forms a water soluble complex with a dilute aqueous solution of NaCN in the presence of:

Native silver metal forms a water soluble complex with a dilute aqueous solution of NaCN in the presence of:

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Dow's process of extraction of Mg involves extraction of Mg from sea water. Sea water is concentrated in sun light and is then treated with slaked lime. Magnesium hydroxide is heated in a stream of HCl to give MgCl2 which is electrolysed to discharge Mg. The mixture is in the ratio 35 percent sign M g C l subscript 2 end subscript plus 50 percent sign N a C l plus 15 percent sign C a C l subscript 2 end subscript times N a C l blank a n d blank C a C l subscript 2 end subscript are added to lower the fusion temperature and to increase the conductance.
M g to the power of 2 plus end exponent plus C a left parenthesis O H right parenthesis subscript 2 end subscript ⟶ M g left parenthesis O H right parenthesis subscript 2 end subscript plus C a to the power of 2 plus end exponent
M g left parenthesis O H right parenthesis subscript 2 end subscript plus 2 H C l ⟶ M g C l subscript 2 end subscript plus 2 H subscript 2 end subscript O blank left parenthesis l i q u i d right parenthesis
Electrolysis of fused MgCl2 stack ⟶ with text  Anode  end text on top 2 C l to the power of minus end exponent ⟶ C l subscript 2 end subscript plus 2 subscript negative 1 end subscript e to the power of ring operator end exponent stack ⟶ with text  Cathode  end text on top M g to the power of 2 plus end exponent plus 2 subscript negative 1 end subscript e to the power of ring operator end exponent ⟶ M g
electrolysed is protected from atmospheric oxidation by a blanket of inert gases
In the hydrated chloride of Mg the value of of x is

Dow's process of extraction of Mg involves extraction of Mg from sea water. Sea water is concentrated in sun light and is then treated with slaked lime. Magnesium hydroxide is heated in a stream of HCl to give MgCl2 which is electrolysed to discharge Mg. The mixture is in the ratio 35 percent sign M g C l subscript 2 end subscript plus 50 percent sign N a C l plus 15 percent sign C a C l subscript 2 end subscript times N a C l blank a n d blank C a C l subscript 2 end subscript are added to lower the fusion temperature and to increase the conductance.
M g to the power of 2 plus end exponent plus C a left parenthesis O H right parenthesis subscript 2 end subscript ⟶ M g left parenthesis O H right parenthesis subscript 2 end subscript plus C a to the power of 2 plus end exponent
M g left parenthesis O H right parenthesis subscript 2 end subscript plus 2 H C l ⟶ M g C l subscript 2 end subscript plus 2 H subscript 2 end subscript O blank left parenthesis l i q u i d right parenthesis
Electrolysis of fused MgCl2 stack ⟶ with text  Anode  end text on top 2 C l to the power of minus end exponent ⟶ C l subscript 2 end subscript plus 2 subscript negative 1 end subscript e to the power of ring operator end exponent stack ⟶ with text  Cathode  end text on top M g to the power of 2 plus end exponent plus 2 subscript negative 1 end subscript e to the power of ring operator end exponent ⟶ M g
electrolysed is protected from atmospheric oxidation by a blanket of inert gases
In the hydrated chloride of Mg the value of of x is

chemistry-General
General
chemistry-

Dow's process of extraction of Mg involves extraction of Mg from sea water. Sea water is concentrated in sun light and is then treated with slaked lime. Magnesium hydroxide is heated in a stream of HCl to give MgCl2 which is electrolysed to discharge Mg. The mixture is in the ratio 35 percent sign M g C l subscript 2 end subscript plus 50 percent sign N a C l plus 15 percent sign C a C l subscript 2 end subscript times N a C l blank a n d blank C a C l subscript 2 end subscript are added to lower the fusion temperature and to increase the conductance.
M g to the power of 2 plus end exponent plus C a left parenthesis O H right parenthesis subscript 2 end subscript ⟶ M g left parenthesis O H right parenthesis subscript 2 end subscript plus C a to the power of 2 plus end exponent
M g left parenthesis O H right parenthesis subscript 2 end subscript plus 2 H C l ⟶ M g C l subscript 2 end subscript plus 2 H subscript 2 end subscript O blank left parenthesis l i q u i d right parenthesis
Electrolysis of fused MgCl2
electrolysed is protected from atmospheric oxidation by a blanket of inert gases.
M g to the power of 2 plus end exponent plus C a left parenthesis O H right parenthesis subscript 2 end subscript ⟶ M g left parenthesis O H right parenthesis subscript 2 end subscript downwards arrow plus C a to the power of 2 plus end exponent2 This reaction indicates :

Dow's process of extraction of Mg involves extraction of Mg from sea water. Sea water is concentrated in sun light and is then treated with slaked lime. Magnesium hydroxide is heated in a stream of HCl to give MgCl2 which is electrolysed to discharge Mg. The mixture is in the ratio 35 percent sign M g C l subscript 2 end subscript plus 50 percent sign N a C l plus 15 percent sign C a C l subscript 2 end subscript times N a C l blank a n d blank C a C l subscript 2 end subscript are added to lower the fusion temperature and to increase the conductance.
M g to the power of 2 plus end exponent plus C a left parenthesis O H right parenthesis subscript 2 end subscript ⟶ M g left parenthesis O H right parenthesis subscript 2 end subscript plus C a to the power of 2 plus end exponent
M g left parenthesis O H right parenthesis subscript 2 end subscript plus 2 H C l ⟶ M g C l subscript 2 end subscript plus 2 H subscript 2 end subscript O blank left parenthesis l i q u i d right parenthesis
Electrolysis of fused MgCl2
electrolysed is protected from atmospheric oxidation by a blanket of inert gases.
M g to the power of 2 plus end exponent plus C a left parenthesis O H right parenthesis subscript 2 end subscript ⟶ M g left parenthesis O H right parenthesis subscript 2 end subscript downwards arrow plus C a to the power of 2 plus end exponent2 This reaction indicates :

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Extraction of Aluminium can be understand by :  electrolytic reduction of Al2O3
Electrolyte : (Al2O3 + Cryolite) .
Cathode : Graphite inside the Fe container
Anode : Graphite rods
What is wrong if anode is made of nickel instead of graphite?

Extraction of Aluminium can be understand by :  electrolytic reduction of Al2O3
Electrolyte : (Al2O3 + Cryolite) .
Cathode : Graphite inside the Fe container
Anode : Graphite rods
What is wrong if anode is made of nickel instead of graphite?

chemistry-General
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Extraction of Aluminium can be understand by :  electrolytic reduction of Al2O3
Electrolyte : (Al2O3 + Cryolite) .
Cathode : Graphite inside the Fe container
Anode : Graphite rods
The molten electrolytes contains N a to the power of plus end exponent comma A l to the power of 3 plus end exponent comma C a to the power of 2 plus end exponentbut only Al gets deposited at cathode because :

Extraction of Aluminium can be understand by :  electrolytic reduction of Al2O3
Electrolyte : (Al2O3 + Cryolite) .
Cathode : Graphite inside the Fe container
Anode : Graphite rods
The molten electrolytes contains N a to the power of plus end exponent comma A l to the power of 3 plus end exponent comma C a to the power of 2 plus end exponentbut only Al gets deposited at cathode because :

chemistry-General
General
chemistry-

Extraction of Aluminium can be understand by :  electrolytic reduction of Al2O3
Electrolyte : (Al2O3 + Cryolite) .
Cathode : Graphite inside the Fe container
Anode : Graphite rods
The function of fluorspar (CaF2) is :

Extraction of Aluminium can be understand by :  electrolytic reduction of Al2O3
Electrolyte : (Al2O3 + Cryolite) .
Cathode : Graphite inside the Fe container
Anode : Graphite rods
The function of fluorspar (CaF2) is :

chemistry-General
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