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The latest Messages 7
2021-05-31 13:44:48
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2021-05-31 13:01:17
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2021-05-31 11:30:15
PHYSICS FORMULAS
Magnetic effect of Electric Current
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2021-05-31 11:30:14
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2021-05-31 08:53:50
PHYSICS FLASHCARDS
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3.2K views05:53
2021-05-30 11:07:49
Increasings or Decreasing Order
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 > Bi̟202
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
»»--☆
1.2K views08:07
2021-05-30 11:07:26
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2021-05-30 08:46:27
Postulates of kinetic theory of gases
A gas consists of large number of tiny particles called molecules.
Volume occupied by gas molecules, is negligible as compared to the total volume of gas.
There is continuous rapid random motion of gas molecules. The molecules collide with each other and against walls of container.
The molecules are perfectly elastic bodies and there is no loss of kinetic energy during collisions.
There are no attractive forces between the molecules of gas.
The pressure exerted by a gas is due to bombardment of gas molecules against the walls of the container.
The different molecules possess different velocities and hence different energies. The average K.E. is directly proportional to absolute temperature.
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2021-05-30 08:45:10
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2021-05-30 08:15:19
Transportation in Plants
The plants have low energy needs, as they use relatively slow transport systems.
Plant transport systems move energy from leaves and raw materials from roots to all their parts.
The xylem (tissue) moves water and minerals obtained from the soil to all other parts of the plants.
The phloem (tissue) transports products of photosynthesis from the leaves (where they are synthesized) to other parts of the plant.
Movement of Water in Plants
Water moves into the root from the soil and then steady it moves into the root xylem, creating a column of water, which is progressively pushed upwards.
Evaporation of water molecules from the cells of a leaf (see the image given above) creates a suction process, which pulls water from the xylem cells of roots; this process keeps going on.
The loss of water in the form of vapor from the leaves (i.e. aerial parts) of the plant is known as transpiration.
Transpiration, likewise, helps in the absorption and upward movement of water and minerals dissolved in it from roots to the leaves.
Transpiration also helps in the temperature regulation (in plants).
The transport of soluble products of photosynthesis is known as translocation, which occurs in the part of the vascular tissue known as phloem.
Along with photosynthesis products, the phloem also transports amino acids and other substances, which are ultimately delivered to roots, fruits, seeds, and to growing organs.
1.1K views05:15