CBSE > Class 12 > Chemistry | CBSE Board | Homework Help

Solution is the homogenous mixture of two or more pure components. Three types of solution: 1.Gaseous Solution-e.g. mixture of oxygen and nitrogen 2.Liquid Solution-e.g. glucose dissolved in water 3.Solid Solution-e.g.mixture of hydrogen in palladium

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Log 9.761 = ?

Posted by Ayush Sharma 6 years, 8 months ago

CBSE > Class 12 > Chemistry

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A 10cmcube sample of human urine was found to have 5 miligrams of urea on analysis. Calculate the molarity of the given sample with respect to urea ( mol mass of urea=60)

Posted by Muskan Shah 6 years, 8 months ago

CBSE > Class 12 > Chemistry

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What is standard electrode potential

Posted by Hritik Kumar 6 years, 8 months ago

CBSE > Class 12 > Chemistry

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Shatayu Ganvir 6 years, 8 months ago

E°

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Yogita Ingle 6 years, 8 months ago

Standard electrode potential is the potential that arises in an electrochemical cell under standard conditions (pressure = 1atm, temperature = 298K, concentration = 1M). The symbol ‘E^o_cell’ represents the standard electrode potential of a cell.

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Tripti Rawat 6 years, 8 months ago

standard electrode potential is defined as the measure of the individual potential of reversible electrode at standard state with ions at an effective concentration of 1mol dm-3 at the pressure of 1 atm.

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Why do we need nerst equation

Posted by Hritik Kumar 6 years, 8 months ago

CBSE > Class 12 > Chemistry

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Shatayu Ganvir 6 years, 8 months ago

To know the relationship between concentration of electrolyte and temperature with the electrode pontential of cell

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What is raoults law 9f lowering of vapour pressure ?

Posted by Vicky Kumar 6 years, 8 months ago

CBSE > Class 12 > Chemistry

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Yogita Ingle 6 years, 8 months ago

Raoult’s law

Raoult’s law establishes a quantitative relationship between the partial vapour pressure and mole fraction of a solution.
This law is only for liquid-liquid solution.
The law states that for a solution of volatile liquids, the partial vapour pressure (p) of each component in the solution is directly proportional to its mole fraction (x).
Mathematically, p ∝ x

Or p = p ⁰x

Where p⁰ is the vapour pressure of pure component at the same temperature.

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Tripti Rawat 6 years, 8 months ago

Raoult's Law is defined as the vapor pressure of a solution of a non volatile solute is equal to the mole fraction of pure solvent and multiplied by the vapor pressure of the pure solvent at same temperature.

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What is lattice point.

Posted by Aman Gupta 6 years, 8 months ago

CBSE > Class 12 > Chemistry

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Sushant Raj 6 years, 8 months ago

Each point in Crystal lattice is called lattice point.

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Yogita Ingle 6 years, 8 months ago

Each point in the crystal lattice represents a constituent particle which may be atom, molecule, ion.
Each points in the lattice is called lattice point or lattice site.
The points are joined by lines just to represent the geometry of the lattice.

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Tripti Rawat 6 years, 8 months ago

A Lattice point is the position in the unit cell or in a crystal where the probability of finding an atom or an ion is the highest.

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Density of 3M Nacl solution is 1.25gpercc .The molality of solution is

Posted by Anshu Kumari 6 years, 8 months ago

CBSE > Class 12 > Chemistry

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Shatayu Ganvir 6 years, 8 months ago

Use formula m=M×1000/d×100-M.GMW of solute

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Find the emf (a) Ni/Ni2+(0.160M)//Ag+(0.002M)//Ag

Posted by Rajandra 123 Kumbhkar 456 6 years, 8 months ago

CBSE > Class 12 > Chemistry

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Rajandra 123 Kumbhkar 456 6 years, 8 months ago

I want the solution of this question formula I know

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Pragati Gola 6 years, 8 months ago

Eo=E(Ni/Ni2+)-E(Ag+/Ag)

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What are the units of bakelite?

Posted by Shiv Shiv 6 years, 8 months ago

CBSE > Class 12 > Chemistry

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Yogita Ingle 6 years, 8 months ago

Bakelite- the monomeric unit present is formaldehyde (HCHO) & phenol (C₆H₅OH).Bakelite is used for making glue for binding laminated wooden planks & in varnishes,combs, fountain pens, electrical switches.

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Jewisha R Marak 6 years, 8 months ago

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Write the monomeric repeating unit of 1.) Neoprene. 2.) PVC

Posted by Shiv Shiv 6 years, 8 months ago

CBSE > Class 12 > Chemistry

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Yogita Ingle 6 years, 8 months ago

Polyvinyl chloride (PVC) –the monomeric unit present is vinyl chloride (CH₂ =CH –Cl) PVC is used in the manufacture of rain coats,curtain cloths, hand bags, toys, artificial flooring,gramophone records & as a good insulating material in wires & other electrical goods.
Teflon (PTFE)- The monomeric unit present is tetrafluoroethene (n F₂C = CF₂). Teflon is used as a material resistant to heat & chemical attack.It is also used for making gaskets, pump packings, valves, oil seals,non lubricated bearings.

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How to calculate ionisation enthalpy....?

Posted by Swetha Sri 6 years, 8 months ago

CBSE > Class 12 > Chemistry

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Yogita Ingle 6 years, 8 months ago

Ionization Enthalpy of elements is the amount of energy that an isolated gaseous atom requires to lose an electron in its ground state. Losing of electrons results in the formation of cations.

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Shivangi Vats 6 years, 8 months ago

I think anuraag is ryt

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Swetha Sri 6 years, 8 months ago

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Swetha Sri 6 years, 8 months ago

Then what will be for hydrogen

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Swetha Sri 6 years, 8 months ago

Ohhh??

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Anuraag Atri 6 years, 8 months ago

(atomic number-1)2

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How does werners coordination theory account for the non ionic nature of the complex Co Cl3 (Nh3)3

Posted by Mr. Virendra Kumar Verma 6 years, 8 months ago

CBSE > Class 12 > Chemistry

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Give one example of non aqueous liquid solution .

Posted by Sandeep Kumar 6 years, 8 months ago

CBSE > Class 12 > Chemistry

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Prashant Singh 6 years, 8 months ago

iodine in alcohol

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Name solvent of brass, bronze ,air and steel .

Posted by Sandeep Kumar 6 years, 8 months ago

CBSE > Class 12 > Chemistry

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Prashant Singh 6 years, 8 months ago

solvent of brass,bronze and steel is solid and solvent air ka gas

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How to find bond order of a molecule without using the structure??

Posted by Jayaasrii?? Jayaasrii 6 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Swetha Sri 6 years, 8 months ago

Nb-Na\2

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Calculate the mole fration of ethylene glycol (C2H6O2) in a solution containing 20 percent of (C2H6O2) by mass???

Posted by Shweat Panday 6 years, 8 months ago

CBSE > Class 12 > Chemistry

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Rajandra 123 Kumbhkar 456 6 years, 8 months ago

Given Mass of C2H6O2 =20g Mass of water = 80g We know that :- Molar mass of ethylene glycone =12*2+1*6+16*2 =62 Moles of ethylene glycone = mass of solute / molar mass of solute = 20/62 =0.32 Moles of water = mass of solvent / molar mass of solvent =80/18 =4.44 Mole fraction of solute = moles of solute / moles of solute + moles of solvent =0.32/0.32+4.44 =0.32/4.76 =0.06 Mole fraction of solvent =1- mole fraction of solute =1-0.06 =0.94

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What is galvanic cell and working

Posted by Himanshu Arya 6 years, 8 months ago

CBSE > Class 12 > Chemistry

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Himanshu Arya 6 years, 7 months ago

Thankyou Yogita

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Yogita Ingle 6 years, 8 months ago

The Galvanic Cells is a device that transforms chemical energy into electric energy. It is the common application of electro chemistry which is also called battery. It was invented by Luigi Galvani and Alessandro Volta which has capability of producing a voltage. It has two conductive electrodes, called the anode and the cathode. The anode is an electrode where oxidation occurs. The cathode is an electrode where reduction takes place.
The Galvanic Cells is a device that transforms chemical energy into electric energy. It is the common application of electro chemistry which is also called battery. It was invented by Luigi Galvani and Alessandro Volta which has capability of producing a voltage.

In this cell there is a container in which a solution of concentrated Copper Sulphate (CuSO₄) is kept inside it and a copper rod is inserted inside the solution of CuSO₄ which act like cathode. Inside this container a porous containeris kept in which concentrated Sulphuric Acid (H₂SO₄) is filled in which a zinc rod is inserted in it which acts like anode. Thus when a wire is connected through copper rod and zinc rod an electric current starts to flow.

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What is the process of crystallisation?

Posted by Akarsh Gupta 6 years, 8 months ago

CBSE > Class 12 > Chemistry

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Tripti Rawat 6 years, 8 months ago

Crystallization is the process by which a solid forms, where the atoms or molecules are highly organized into a structure known as a crystal. Some of the ways by which crystals form are precipitating from a solution, freezing, or more rarely deposition directly from a gas.

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Ayush Verma 6 years, 8 months ago

The reverse process of dissolution is called crystalllisation

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67.2litre of hydrogen in use in 5minute what is the average current passed through the cell

Posted by Rahul Jaykar 6 years, 8 months ago

CBSE > Class 12 > Chemistry

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Is limestone when dissolved in water which deviations it show

Posted by Dragon Boll Master 6 years, 8 months ago

CBSE > Class 12 > Chemistry

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difference between electrode and electrolyte

Posted by Rajandra 123 Kumbhkar 456 6 years, 8 months ago

CBSE > Class 12 > Chemistry

2 answers

Yogita Ingle 6 years, 8 months ago

If you put strips of two different metals into an appropriate electrolyte solution you are likely to find that a potential difference appears between the two strips. This system is a galvanic cell also known as battery.
The potential difference produced by an EMF associated with the chemical reactions between both the metals and the electrolyte.
The interface between each piece of metal and the electrolyte solution forms an electrode.
Electrodes are always used in pairs.
Electrolyte is the solution in which the electricity is passed through the electrodes

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Tripti Rawat 6 years, 8 months ago

An electrolytic cell has three component parts: an electrolyte and two electrodes (a cathode and an anode). The electrolyte is usually a solution of water or other solvents in which ions are dissolved. Molten salts such as sodium chloride are also electrolytes.

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Find out no. Of cation vaccancy .If 1 molar SrCl2 is introduced into the NaCl solid

Posted by Armaan D 6 years, 8 months ago

CBSE > Class 12 > Chemistry

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What is electochemical series?? What are its charectristics ?

Posted by Manish Yadav 6 years, 8 months ago

CBSE > Class 12 > Chemistry

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Yogita Ingle 6 years, 8 months ago

When the electrodes (metals and non-metals) in contact with their ions are arranged on the basis of the values of their standard reduction potentials or standard oxidation potentials, the resulting series is called the electrochemical or electromotive or activity series of the elements.
Characteristics of Electrochemical Series

The substances which are stronger reducing agents than hydrogen are placed above hydrogen in the series and have negative values of standard reduction potentials.
All those substances which have positive values of reduction potentials and placed below hydrogen in the series are weaker reducing agents than hydrogen.
The substances which are stronger oxidising agents than H+ion are placed below hydrogen in the series.
The metals on the top (having high negative values of standard reduction potentials) have the tendency to lose electrons readily. These are active metals.
The activity of metals decreases from top to bottom.
The non-metals on the bottom (having high positive values of standard reduction potentials)
have the tendency to accept electrons readily. These are active non-metals.
The activity of non-metals increases from top to bottom.

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Priya Ravi 6 years, 8 months ago

It's play very im.role...as it helps to find out the EMF of the solution..in both i.e.oxidation potential term as well as resuction potential term..

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Priya Ravi 6 years, 8 months ago

Electrochemical are the series of reduction potential ..of metals.or nonmetal ..when electrochemical reaction take place

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Why aqous solution of ethanol not seprated by Distilation

Posted by Nv Nager 6 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Aman Kumar 6 years, 8 months ago

Ethanol and water mix together to form azeotropes which can not be separated by simple distillation. This is because azeotropes act as single compound and boil at the same temperature.....

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If r=K[A]^2 [B ] for a reaction by what factor is the initial rate multiplied if the [A ] is multiplied by 1.5 and the [B ] is tripled

Posted by Ankit Singroha 6 years, 8 months ago

CBSE > Class 12 > Chemistry