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  • 2 answers
Right gaurav ­čĹŹ­čĹŹ It is helpfull to arrange everything in chart­čĹ»­čĹ»

Gaurav Seth 6 hours ago

Truly speaking p block is a vast chapter , full of reactions and different compounds. But if we arrange the things in a proper way , it's the easiest chapter ever. What I did was group the things together . I took large white sheets and arranged all the electronic configurations, chemical properties, physical properties, oxoacids , allotropes of Group 15 to 18 groupwise. On another sheets I noted down the chemical properties and reactions of different elements of each group like- Sulphur dioxide, Phosphine etc… This arrangement made the chapter easier for me .

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M. K 6 hours ago

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Aakash Kumar 3 hours ago

Hc verma

Rock ├ŚHimanshu 21┬áhours ago

Ncert and modern or ms chauhan
For jee MTG is the best one
Modern abc+ book is best
  • 2 answers

Jashan . 1 day ago

Yogita can you explain?

Yogita Ingle 1 day ago

The coordination number of Fe in [Fe(EDTA)] is 6.

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Bhavya Sachdeva 1 day ago

It is because water has greater number of unpaired electrons than cyanide group and higher is the number of unpaired electron greater is the magnetic moment.
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Yogita Ingle 1 day, 23 hours ago

(i) Tetra phosphorus decoxide (P4O10) Molecular
(ii) Ammonium phosphate (NH4)3PO4 Ionic
(iii) SiC Network (covalent)
(iv) I2               Molecular
(v) P4              Molecular
(vi) Plastic. Amorphous
(vii) Graphite Network (covalent)
(viii) Brass Metallic
(ix) Rb                        Metallic
(x) LiBr           Ionic
(xi) Si                          Network (covalent)
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Rishab Jain 1 day, 21 hours ago

Absorbents are those which is absorbed ex. Water is absorbed by cotton clotj but there is vry imp. Difference between adsorb and absorb , adsorb means on its surface not in surface ­čĄč

Umar Raza 2 days ago

Absorbents : Absorbents are those substance which is absorb.
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Yogita Ingle 2 days, 5 hours ago

Fluorine is more electronegative than chlorine, therefore, it can attract a shared pair of electron more easily and strongly than chlorine.

Thus, it can easily accept the pair of electrons and undergoes reduction. Thus it is a strong oxidizing agent than chlorine.

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Sahil Ateeque Khan 2 days, 3 hours ago

The ionic solid conduct electricity in molten state because in molten state the ions are free to move i.e, they are dissociat in cation +ve and anion -ve. Hence, they conduct electricity in molten state.

Adil Abbas 2 days, 5 hours ago

"The ionic solid conduct electricity in molten state as in molten state the ions are in motion and free to move as compare to solid hence they conduct electricity in molten state"

Gaurav Seth 2 days, 7 hours ago

In ionic compounds, electricity is conducted by ions. In solid state, ions are held together by strong electrostatic forces and are not free to move about within the solid. Hence, in molten state or in solution form, the ions are free to move and can conduct electricity. 

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Prateeth N 2 days, 19 hours ago

Because pentanol contain more carbon atoms than compared to ethanol
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Umar Raza 2 days ago


Anoop Kasaudhan 2 days ago


Prateeth N 2 days, 9 hours ago


Manisha Yadav 2 days, 9 hours ago

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Gaurav Seth 3 days, 1 hour ago

  • On a large scale, ammonia is manufactured by Haber’s process.


  • The optimum conditions for the production of ammonia are a pressure of 200 × 10Pa (about 200 atm), a temperature of ~ 700 K and the use of a catalyst such as iron oxide with small amounts of K2O and Al2O3 to increase the rate of attainment of equilibrium.
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Gaurav Seth 3 days, 3 hours ago


The reaction is

Here k = 2.5 × 10-4 M s-1

The order of the reaction is zero i.e.,

Rate = [Reactant]o

Rate = 2.5 × 10-4 × 1 = 2.5 10-4 mol L-1 S-1

The rate of formation of N2 = 2.5 10-4 mol L-1 S-1

Therefore, rate of formation of H2 = 7.5 × 10-4 mol L-1 S-1

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Gaurav Seth 3 days, 4 hours ago

Volume of H2SO4 (V1) = 30 ml)

Diluted volume of H2SO4 (V2) = 500 ml

Number of moles present in 1000 mL of 0.5 M H2SO4 = 0.5 mol

Initial molarity M1= 0.5 M 

We have to find M(molarity of 500 ml solution)

M2V2 = M1V1

M2  × 500  = 0.5 × 30

M2 = 15/ 500 = 0.03 M

  • 5 answers
Yes gaurav ­čĹ»­čĹ»

Gaurav Bagga 2 days, 22 hours ago

No because all the deleted chapters or topics were quite scoring

Neelmani Pradhan 3 days, 3 hours ago

All CBSE students except me

Sakshi Yadav 3 days, 23 hours ago

I am happy with the syllabus reduce

Nisha Kumari 3 days, 23 hours ago

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Yaar ­čśŹ 3┬ádays, 23┬áhours ago

Hlww this is deleted from cbse new syllabus

Yogita Ingle 4 days ago

  • In 1880 van’t Hoff introduced a factor i and was named as the van’t Hoff factor.
  • The van’t Hoff factor account for the degree of dissociation or association.
  • The van’t Hoff factor can be defined as the ratio of Normal molar mass to the abnormal molar mass. Mathematically,

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Manisha Yadav 2 days, 19 hours ago


Md Fardeen 2 days, 21 hours ago

@Shraddha kansal tm kaha se ho?

Shraddha Kansal 3 days, 21 hours ago

Your welcome

Md Fardeen 4 days ago

Shraddha kansal thanks Thodi wrong Type ho gya tha

Shraddha Kansal 4 days, 1 hour ago

I think u want to ask (ch3)3-c-cl And if you want to ask this formula than its name is 2-chloro 2-methyl propane Your formula is wrong
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Are you asking heterogens or heterogenous
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Yaar ­čśŹ 6┬ádays, 1┬áhour ago

Available in this app ..
  • 2 answers

Yogita Ingle 6 days, 5 hours ago

  • The chlorofluorocarbon compounds of methane and ethane are jointly called freons.
  • They are very stable, non-corrosive, non-toxic, and unreactive liquefiable gases.
  • Freon 12 (CCl2F2) is most commonly used Freons in industrial sector.
  • Freons are manufactured from tetra chloromethane using Swarts reaction.
  • Freons are extensively used in aerosol propellants, refrigerants and air conditioners.

Ayush Mishra 6 days, 6 hours ago

Freons are chlorine and flourine compound used in refrigerator and in A.C. as cooling gas
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Yogita Ingle 6 days, 5 hours ago

Fluorine forms only one oxoacid, HOF due to small atomic size and high electronegativity. Fluorine cannot act as central atom in higher oxoacids.

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Yogita Ingle 6 days, 21 hours ago

Adsorption is always exothermic. This statement can be explained in two ways.

(i) Adsorption leads to a decrease in the residual forces on the surface of the adsorbent. This causes a decrease in the surface energy of the adsorbent. Therefore, adsorption is always exothermic.
(ii) ΔH of adsorption is always negative. When a gas is adsorbed on a solid surface, its movement is restricted leading to a decrease in the entropy of the gas i.e., ΔS is negative. Now for a process to be spontaneous, ΔG should be negative.


Since ΔS is negative, ΔH has to be negative to make ΔG negative. Hence, adsorption is always exothermic.

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