CBSE > Class 11 > Chemistry | CBSE Board | Homework Help

Number of mole of methane =3.2/16=0.2 Number of mole of carbon dioxide =4.4/44=0.1 Total number of moles =0.2+0.1=0.3 Temperature =273+27=300k Acc. To ideal gas equation Pv=nrt P(9)=(0.3)(0.0821)(300) P=(0.3)(0.0821)(300)/9 =0.821atmosphere P=0.821atp

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Explain the types of molecular speed

Posted by Singh Rajput 6 years, 10 months ago

CBSE > Class 11 > Chemistry

1 answers

Mithun Kumar 6 years, 10 months ago

There are basically three different types of molecular speed that is: root mean speed, average speed,most probable speed.

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Explain the types of hybridisation

Posted by Singh Rajput 6 years, 10 months ago

CBSE > Class 11 > Chemistry

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Sanidhya Jadaun? 6 years, 10 months ago

Bhai Ncert page no.116 to 118

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How to find ∆G

Posted by Muskan Sekho 6 years, 10 months ago

CBSE > Class 11 > Chemistry

1 answers

Singh Rajput 6 years, 10 months ago

Delta G= _2.303 RT log K

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Easy definition only of gibbs energy

Posted by Muskan Sekho 6 years, 10 months ago

CBSE > Class 11 > Chemistry

3 answers

Sugam Sharma 6 years, 10 months ago

Final way to check that reaction is spontaneous or not

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Muskan Sekho 6 years, 10 months ago

Full definition

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Naveen Kumar Sharma 6 years, 10 months ago

Change in energy

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CH2=cH2+NaNH2 gives

Posted by Kantilal Patel Kantilal Patel 6 years, 10 months ago

CBSE > Class 11 > Chemistry

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Explain f-centre

Posted by Kartik Gupta 6 years, 10 months ago

CBSE > Class 11 > Chemistry

2 answers

Yogita Ingle 6 years, 10 months ago

A compound may have excess metal ion. When negative ion is absent from its lattice side and compound have excess metal ion and leaving a hole which occupied by electron to maintain electrical neutrality , the ionic sites are called F center .Colour in these crystals are impart by unpaired electrons.
These types of defects are found in crystals which have electric neutrality and Schoottky defects .The hole occupied by electron is called F–center. This F center is responsible for most of the interstitial properties of compound .
For example We observe this effect when Crystals of NaCl heated in an atmosphere of sodium vapour.

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Yogita Ingle 6 years, 10 months ago

An F-Center or Farbe (German for colour) center is a type of crystallographic defect in which an anionic vacancy in a crystal is filled by one or more electrons, depending on the charge of the missing ion in the crystal or mainly due to the reason that when a compound is heated to a high temperature (mainly metallic oxides) the ions get excited and get displaced from their respective positions in their crystal structure but while doing so these ions leave behind some electrons in the vacated spaces. This leads to the phenomenon of colouring of compounds. This is used to identify many compounds, especially zinc oxide (yellow). Electrons in such a vacancy tend to absorb light in the visible spectrum such that a material that is usually transparent becomes colored. Thus the origin of the name, F-center, which originates from the German Farbzentrum. The translation of this term also provides the synonym color center, which can also refer to such defects. F-centers are often paramagnetic and can then be studied by electron paramagnetic resonance techniques. The greater the number of F-centers, the more intense is the color of the compound. A way of producing F centers is to heat a crystal in the presence of an atmosphere of the metal that constitutes the material, e.g.: NaCl heated in a metallic Na atmosphere.

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Explain schottky defect

Posted by Kartik Gupta 6 years, 10 months ago

CBSE > Class 11 > Chemistry

1 answers

Yogita Ingle 6 years, 10 months ago

Schottky Defect: It is basically a vacancy defect in ionic solids. In order to maintain electrical neutrality, the number of missing cations and anions are equal. Like simple vacancy defect, Schottky defect also decreases the density of the substance. Number of such defects in ionic solids is quite significant.
For example, in NaCl there are approximately 106 Schottky pairs per cm3 at room temperature. In 1 cm³there are about 1022 ions. Thus, there is one Schottky defect per 1016 ions. Schottky defect is shown by ionic substances in which the cation and anion are of almost similar sizes. For example, NaCl, KCl, CsCl and AgBr. It may be noted that AgBr shows both, Frenkel as well as Schottky defects.<

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Inert pair effect what ❓?

Posted by Garama Garam Indian 6 years, 10 months ago

CBSE > Class 11 > Chemistry

2 answers

Prakhar J 6 years, 10 months ago

The reluctance of s electron pair in take part in chemical bonding

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Yogita Ingle 6 years, 10 months ago

In the elements of 4th, 5th and 6th period of the p-block the electrons present in the intervening d and f-orbitals do not shield the r-electrons of the valence shell effectively.
As a result, {ns}² -electrons remain more tightly held by the nucleus and hence, do not participate in bonding. This is called inert pair effect.

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Write relationship between Kp and Kc

Posted by Shakshi Rana 6 years, 10 months ago

CBSE > Class 11 > Chemistry

1 answers

Avantika Tayal 6 years, 10 months ago

Kp=kc ×RT

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How does surface tension of a liquid changes with temperature

Posted by Shakshi Rana 6 years, 10 months ago

CBSE > Class 11 > Chemistry

1 answers

Yogita Ingle 6 years, 10 months ago

Surface tension and viscosity both are due to intermolecular forces. As the temperature increases the kinetic energy of molecule increases this leads to the decrease in intermolecular forces and therefore decrease in surface tension and viscosity. So we can say that temperature inversely affect the surface tension and viscosity.

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Why is potassium lighter than sodium?¿?¿

Posted by Prakhar J 6 years, 10 months ago

CBSE > Class 11 > Chemistry

2 answers

Harshita Verma 6 years, 10 months ago

Basically, in the case of sodium and potassium the increase in shell size outweighs the pull of the core on the outer shell electron and so potassium is less dense than sodium. When we more from Na to K, effect of increase in volume is more pronounced as compared to effect of increase in atomic mass.

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Shreya Dixit 6 years, 10 months ago

Because K has less density than Na

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What is the difference between baking soda and baking powder

Posted by Prakhar J 4 years, 6 months ago

CBSE > Class 11 > Chemistry

1 answers

Sia ? 4 years, 6 months ago

Baking soda contains one ingredient, sodium bicarbonate. However, Baking powder contains sodium bicarbonate, monocalcium phosphate and either sodium acid pyrophosphate or sodium aluminum sulfate.

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In 5 ch states of matter their are some questions which i can't find , these are jet aeroplane , hot air balloon , pressure of dry gas anyone who find these questions tell me with their answers.

Posted by Muskan Sekho 6 years, 10 months ago

CBSE > Class 11 > Chemistry

1 answers

Muskan Sekho 6 years, 10 months ago

Plzz any one knows

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Diagonal relationship in periodic table

Posted by [email protected] [email protected] 6 years, 10 months ago

CBSE > Class 11 > Chemistry

2 answers

[email protected] [email protected] 6 years, 10 months ago

It applies to all the periods or only second period ??

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Sanidhya Jadaun? 6 years, 10 months ago

The diagonal relationship is due to the similarity in ionic sizes and / or charge/radius ratio of the elements.eg.lithium shows similarity to magnesium and berilliyum to aluminium in many of their properties.

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Find the wave number of the radiation of energy if n=1 jumps to n=2

Posted by Makyr Rynth'S 6 years, 10 months ago

CBSE > Class 11 > Chemistry

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What would be the effect on kc? If more pcl5 is added

Posted by Rahul Singh 6 years, 10 months ago

CBSE > Class 11 > Chemistry

0 answers

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What to do in practical exam

Posted by Jayapragash M 6 years, 10 months ago

CBSE > Class 11 > Chemistry

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Give an example of reaction of preparation of alkyne

Posted by Nousin Ahamed 6 years, 10 months ago

CBSE > Class 11 > Chemistry

1 answers

Sugam Sharma 6 years, 10 months ago

Polymerisation

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As carbon dioxide (CO2) is non pplar molecular but still it is dissolved in water(H2O) which is a polar molecular. (As we had learned that like be like means polar molecule is dissolved by only polar molecules and non polar bu non polar molecules.

Posted by Advait Gaur 6 years, 10 months ago

CBSE > Class 11 > Chemistry

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Drawbacks of bohr model of atom?

Posted by Muskan Sekho 6 years, 10 months ago

CBSE > Class 11 > Chemistry

2 answers

Sheeja Menon 6 years, 10 months ago

First of all it could be applied only in single electron system . Secondly, it could not explain the formation of molecules . Thirdly, it could not explain the finer details of spectra, ie, splitting of spectral lines in the presence of an external electric or magnetic field.

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Sugam Sharma 6 years, 10 months ago

Very important drawback:- - Bohr model of an atom was based on particle nature of electron but we know that electron is wave Theoretically it was said by de-broglies and practically proved by Davison and Germer

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Easy definition of Dalton's law of partial pressure and its significance?

Posted by Muskan Sekho 6 years, 10 months ago

CBSE > Class 11 > Chemistry

1 answers

Advait Gaur 6 years, 10 months ago

It is simply a postulate given by dalton in which when two non inert pair of gases interact the new compound formed acquire an net external pressure slightly more than its own pressures. So Dalton simpler this concern by introducing partial law of pressures In which the net pressure is equalize to the partial pressure of individual gases(only gas). P = p1+p2+p3+.........+ pn This is significant for understanding thermodynamics later..... In brief order Hopefully this will help's you. ?

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I want to know what is atomic spectra?

Posted by [email protected] [email protected] 6 years, 10 months ago

CBSE > Class 11 > Chemistry

1 answers

Sheeja Menon 6 years, 10 months ago

All atoms and molecules exhibit a characteristic spectra.. The spectra of atoms can be recorded in two ways.. 1. Absorption spectra and 2. Emission spectra......... Absorption spectra gives an idea of the electromagnetic radiations which are absorbed by the atom. These absorbed wavelength come as dark line in electromagnetic spectrum.. The spectrum of radiation emmited by the substance that as absorbed energy Is called emission spectrum

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why is potassium lighter than sodium??

Posted by Prakhar J 6 years, 10 months ago

CBSE > Class 11 > Chemistry

0 answers

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Define state function

Posted by Yash Raj 6 years, 10 months ago

CBSE > Class 11 > Chemistry

1 answers

Sanidhya Jadaun? 6 years, 10 months ago

These are the thermodynamic function which depend only on the state of the system and not on how it reached .eg.like Internal energy,Enthalpy are state function

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What is reaction mechanism?

Posted by Sahil Gupta 6 years, 10 months ago

CBSE > Class 11 > Chemistry