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नवीनतम संदेश

2022-11-26 19:04:33 Most important orders for JEE MAINS and NEET

01. Melting point=
Li > Na > K > Rb > Cs

02. Colour of the flame=
Li-Red, Na-Golden, K-Violet, Rb-Red, Cs-Blue, Ca-Brick red, Sr-Blood red, Ba-Apple green

03. Stability of hydrides =
LiH > NaH > KH > RbH> CsH

04. Basic nature of hydroxides=
LIOH < NaOH < KOH < RbOH < CsOH

05. Hydration energy=
Li> Na > K> Rb > Cs

06. Reducing character=
Li > Cs > Rb > K > Na

07. Stability of +3 oxidation state=
B> Al > Ga > In > T1

08. Stability of +1 oxidation state= Ga < In < TI

09. Basic nature of the oxides and hydroxides=
B< Al< Ga < In < TI

10. Relative strength of Lewis acid= BF3 < BCl3 < BBr3 < BI3

11. Ionisation energy=
B> Al In
12. Reactivity=
C
13. Metallic character=
C< Si < Ge < Sn < Pb

14. Acidic character of the oxides=
Co2 > SiO2 > Ge02 > SnO2 > PbO2

15. Reducing nature of hydrides=
CH4 < SiH4 < GeH4 < SnH4 < PbH4

16. Thermal stability of tetrahalides=
CCl4> SiCl4> GeCl4> SnCl4 > PbCl4

17. Oxidising character of M+4 species=
GeCl4 < SnCl4 < PbCl4

18. Ease of hydrolysis of tetrahalides=
SiCl4 < GeCl4 < SnCl4 < PbCI4

19. Acidic strength of trioxides=
N203 > P2O3 > As2O3

20. Acidic strength of pentoxides=
N2O2 > P2O2> As202 > Sb2O2 > Bi‌202

21. Acidic strength of oxides of nitrogen=
N2O < NO
22. Basic nature/ bond angle/ thermal stability and dipole moment of hydrides=
NH3 > PH3 > AsH3 > SbH3 > BiH3

23. Stability of trihalides of nitrogen=
NF3 > NCl3 > NBr3

24.Lewis base strength=
NF3
25. Ease of hydrolysis of trichlorides=
NCl3 > PCI3 > AsCl3 > SbCl3 > BiCl3

26. Lewis acid strength of trihalides of P, As, and Sb=
PCl3 > ASCl3 > SbCl3

27. Lewis acid strength among phosphorus trihalides
PF3 > PCl3 > PBr3 > PI3

28. Melting and boiling point of hydrides=
H2O > H2Te > H2Se >H2S

29. Volatility of hydrides=
H2O < H2Te < H2Se < H2S

30. Reducing nature of hydrides=
H2S < H2Se < H2Te

31. Covalent character of hydrides=
H2O < H2S < H2Se < H2Te

32. The acidic character of oxides (elements in the same oxidation state)=
SO2 > SeO2 > TeO2 > PoO2
SO3 > SeO3 > TeO3

33. Acidic character of oxide of a particular element (e.g. S)=
SO < SO2 < SO3
SO2 > TeO2 > SeO2 > PoO2

34. Bond energy of halogens=
Cl2 > Br2 > F2 > I2

35. Solubility of halogen in water =
F2 > Cl2 > Br2 > I2

36. Oxidising power=
F2 > Cl2 > Br2 > I2

37. Enthalpy of hydration of X ion=
F- > Cl- > Br- >I-

38. Reactivity of halogens:=
F> Cl> Br > I

39. Ionic character of M-X bond in halides
= M-F > M-Cl > MBr > M-I

40. Reducing character of X ion:=
I- > Br- > Cl- > F-

41. Acidic strength of halogen acids=
HI > HBr > HCI > HF

42. Reducing property of hydrogen halides
= HF < HCL < HBr < HI

43. Oxidising power of oxides of chlorine
= Cl2O > ClO2 > Cl206 > Cl2O7

44. Decreasing ionic size=
02- > F- > Na+ > Mg2+

45. Increasing acidic property=
Na2O3 < MgO < ZnO< P205

46. Increasing bond length=
N2 <02 < F2 < CL2

47. Increasing size=
Ca2+ < Cl- < S2-

48. Increasing acid strength=
HClO < HClO2 < HClO3 < HClO4

49. Increasing oxidation number of iodine=
HI< I2
50. Increasing thermal stability=
HOCl < HOClO < HOClO2 < HOClO3

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33 views16:04

ओपन / कमेंट

2022-11-20 18:32:51

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36 views15:32

ओपन / कमेंट

2022-11-20 06:52:11

According to Le chatelier's principle, adding heat to a solid and liquid in equilibrium will cause the..

Anonymous Quiz

50%

Temperature to increase

18%

Temperature to decrease

29%

Amount of solid to decrease

Amount of liquid to decrease

105 voters27 views03:52

ओपन / कमेंट

2022-11-18 15:47:50

41 views12:47

ओपन / कमेंट

2022-11-17 18:33:22 ⟨⟨ THERMODYNAMICS : BASIC TERMINOLOGY ⟩⟩

✰ System -

Part of the universe under investigation.

✰ Open System -

A system which can exchange both energy and matter with its surroundings.

✰ Closed System -

A system which permits passage of energy but not mass, across its boundary.

✰ Isolated system -

A system which can neither exchange energy nor matter with its surrounding.

✰ Surroundings -

Part of the universe other than system, which can interact with it.

✰ Boundary -

Anything which separates system from surrounding.

✰ State variables -

The variables which are required to be defined in order to define state of any system i.e. pressure, volume, mass, temperature, surface area, etc.

✰ State Functions -

Property of system which depend only on the state of the system and not on the path. Example: Pressure, volume, temperature, internal energy, enthalpy, entropy etc.

✰ Intensive properties -

Properties of a system which do not depend on mass of the system i.e. temperature, pressure, density, concentration,

✰ Extensive properties -

Properties of a system which depend on mass of the system i.e. volume, energy, enthalpy, entropy etc.

✰ Process -

Path along which state of a system changes.

✰ Isothermal process -

Process which takes place at constant temperature

✰ Isobaric process -

Process which takes place at constant pressure

✰ Isochoric process -

Process which takes place at constant volume.

✰ Adiabatic process -

Process during which transfer of heat cannot take place between system and surrounding.

✰ Cyclic process -

Process in which system comes back to its initial state after undergoing series of changes.

✰ Reversible process -

Process during which the system always departs infinitesimally from the state of equilibrium i.e. its direction can be reversed at any moment.

✰ Irriversible Process -

This type of process is fast and gets completed in a single step. This process cannot be reversed. All the natural processes are of this type.

51 views15:33

ओपन / कमेंट

2022-11-16 17:19:33 Trick to Remember Some bi-carboxylic acid

1.Oxalic acid- 0 carbon- Oh
2.Maleic acid- 1 carbon- My
3.Succinic acid- 2 carbon- Sun
4.Glutamic acid-3 carbon- Go
5.Adipic acid- 4 carbon- And
6.Palmitic acid- 5 carbon- play

Number of carbons refers number of -CH2 group between two COOH group.

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76 views14:19

ओपन / कमेंट

2022-11-16 08:00:40

Nitrogen can expand its covalence beyond 4

Anonymous Quiz

61%

True

39%

False

289 voters87 views05:00

ओपन / कमेंट

2022-11-15 09:27:41

A gas is liquefied...

Anonymous Quiz

31%

Above critical temperature and below critical pressure

37%

Below critical temperature and pressure

26%

Above critical temperature and pressure

None of these

351 voters112 views06:27

ओपन / कमेंट

2022-11-14 08:48:25

The correct order of ease of hydrolysis is..

Anonymous Quiz

54%

CCL4

29%

CCL4>Alcl3>Sicl4>PCl5

14%

CCL4

None of the above

28 voters5 views05:48

ओपन / कमेंट

2022-11-13 07:13:55 🇷 🇪 🇲 🇮 🇳 🇩 🇪 🇷

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37 views04:13

ओपन / कमेंट