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Question & Answer Forum

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Rajan Raman answered 4 year(s) , 1 month(s) ago

Compare the stabilities of O2 , O2-,O22- .

Ans: The stabilities of these can be best explained using Molecular orbital theory.
 
(i)                            Formation Oxygen molecule:
Electronic configuration of oxygen atom-1s...

Asked by Abhiram

Oct 29

  • 3 Answers
  • 3 Likes
  • 65497 Views
Agam answered 8 month(s) , 18 day(s) ago

Compare the characteristics of Thallophyta, bryophyta and Pteridophyta.

  Thallophyta Bryophyta Pteridophyta Plant body is thallus. It is not differentiated into root, stem and leaves. Plant body does not have true roots, stems and leaves but shows root like and leaf-like stru...

Asked by Surya rao

Jan 31

  • 10 Answers
  • 16 Likes
  • 64929 Views
Syeda answered 1 year(s) , 5 month(s) ago

More stable among O2+ and O2-

Answer.

O2+ is more stable than O2-.Because According to molecular orbital theory O2+ has 15 electrons &it has one electron

...

Asked by Prasad

May 19

  • 2 Answers
  • 10 Likes
  • 58919 Views
Syeda answered 1 year(s) , 5 month(s) ago

Find the dimensions of constant a and b occurig in van der Waal's equation . [p+a/vsq.][v-b]=RT

(P + a/V 2) (V - b) = RT
P is pressure, V is volume and T is temperature.
[P] = [F/A]  = [MLT −2/L 2] = [ML −1T −2]
[V] = [L...

Asked by Neemit

Jul 12

  • 2 Answers
  • 11 Likes
  • 55217 Views
Syeda answered 1 year(s) , 5 month(s) ago

What are endarch and exarch conditions?

Answer.


They primary xylem tissue in plants is categorized into protoxylem and metaxylem. Protoxylem is the first part of the xylem to mature first and possess small cells. The developme...

Asked by Sagar

Nov 24

  • 2 Answers
  • 2 Likes
  • 42322 Views
Syeda answered 1 year(s) , 5 month(s) ago

Sin 10 Sin 30 Sin 50 sin 70 = 1/16

  Use co-function properties: 
sin10*sin30*sin50*sin70 
= (1/2)sin10*sin50*sin70 
= (1/4)sin20*sin50*sin70/cos10 
= (1/8)sin40*cos40/cos10 
= (1/16)sin80/cos10 
= 1/16

Asked by Rohit

Jul 15

  • 5 Answers
  • 6 Likes
  • 41951 Views
Syeda answered 1 year(s) , 5 month(s) ago

Differences between aliphatic and aromatic compounds

Answer.

Property Aliphatic compounds Aromatic compounds Structure In aliphatic compounds the Carbon compounds are linked to each other...

Asked by Prasad

May 17

  • 2 Answers
  • 2 Likes
  • 40469 Views
Syeda answered 1 year(s) , 5 month(s) ago

What is placentation? What are the different types of placenta seen in plants?

Sol:

Placentation refers to the arrangement of ovules within the ovary. Ovules are attached to ovarian walls through special structures called as placenta. Placentation can be marginal, axile, parietal, bas

...

Asked by Sagar

Dec 8

  • 2 Answers
  • 5 Likes
  • 40145 Views
Sai answered 1 year(s) , 9 month(s) ago

Prove S=ut+1/2at2 using graphical method

Asked by David

Jul 16

  • 1 Answer
  • 6 Likes
  • 38712 Views
Syeda answered 1 year(s) , 5 month(s) ago

RELATIONSHIP BETWEEN ∆H &∆U

Relation between ∆H &∆U:
 
Solids and liquids do not show significant change in the volume when heated. Thus if change in volume, ∆V is insignificant
∆H=∆U+P∆V
∆...

Asked by Sagar

Oct 5

  • 2 Answers
  • 5 Likes
  • 35693 Views
Syeda answered 1 year(s) , 5 month(s) ago

If the density of methanol is 0.793 kg/L, what is its volume needed for making 2.5 L of its 0.25M solution?

in 1 litre, mole = 0.25
in 2.5 litre, mole = 0.625

mass of 1 mole CH3OH = 32g
mass of 0.625 mole = 20g

volume = mass/density = 20/0.793 = 25.2ml

Asked by Tushara

Apr 18

  • 4 Answers
  • 2 Likes
  • 32599 Views
Syeda answered 1 year(s) , 5 month(s) ago

Calculate the total number of electrons present in one mole of methane

Answer.

The number of electrons present in 1 molecule of methane is
CH4 =  1(6) + 4(1) = 10 electrons.
1 molecule of methane has 10 electrons.
1 mole of methane

...

Asked by Adithyan

May 4

  • 2 Answers
  • 2 Likes
  • 31247 Views
Syeda answered 1 year(s) , 5 month(s) ago

Explain the structure of diborane?

Answer.

Diborane is an electron deficient molecule. The two boron atoms and the four terminal hydrogen atoms of the molecule are all in the same plane. These four terminal B -H bonds are reg

...

Asked by A t

Jan 25

  • 2 Answers
  • 2 Likes
  • 30986 Views
Syeda answered 1 year(s) , 5 month(s) ago

If the sum of n terms of an a.p is 3n2 + 5n and its mth term is 164, find the value of m?

Answer.

S = 3n2 + 5n
S1 = a1 = 3+5 = 8
S2 = a1 + a2 =6+10 =16                    ⇒a2 = 8
S

...

Asked by Umakant

Feb 21

  • 3 Answers
  • 4 Likes
  • 29575 Views
Swathi answered 3 year(s) , 6 month(s) ago

50.0 kg of N2 (g) and 10.0 kg of H2 (g) are mixed to produce NH3 (g). Calulate the NH3 (g) formed. Identify the limiting reagent in the production of NH3 in this situation.

Let us write the balanced equation

N2 + 3H2 → 2NH3

Now calculate the number of moles

Number of moles of N2 = 50 kg of N2 = 50 X

...

Asked by Priya

May 14

  • 1 Answer
  • 5 Likes
  • 28482 Views
Syeda answered 1 year(s) , 5 month(s) ago

Difference between non-chordates and chordates

Answer.

CHORDATES NONCHORDATES NOTOCHORD/VERTIBRAL COLOUMN PRESENT ABSENT POST ANAL TAIL PRESENT ABSENT CENTRAL NERVOUS SYSTEM DORSAL,HOLLOW,SINGLE VENTRAL,SOLID,DOUBLE

Asked by Surya rao

Jan 31

  • 4 Answers
  • 4 Likes
  • 28329 Views
Syeda answered 1 year(s) , 5 month(s) ago

It is easier to pull a lawn roller than to push it. Explain using the resolution of forces.

It is easier to pull a lawn roller than to push it. Explain using the resolution of forces. 
Answer:  The force applied to move a body depends upon effective force app...

Asked by Tuba

Jun 13

  • 3 Answers
  • 3 Likes
  • 27564 Views
Syeda answered 1 year(s) , 5 month(s) ago

Largest and Famous Herbarium of world and India ?

Largest and Famous herbirum of:
World - D'histoire Naturelle {Paris, France}
India - The Indian Botanical Garden

Asked by Rajat

Jul 21

  • 4 Answers
  • 2 Likes
  • 27151 Views
Swathi answered 4 year(s) , 7 month(s) ago

Calculate the wavelength of first and limiting lines in Balmer series

For 1 st line in Balmer series n1 =2,n2=3
1/λ 1= 109678[ 1/n 1 2 -1/n 2 2  ]
=109...

Asked by Tushara

May 1

  • 1 Answer
  • 1 Like
  • 22979 Views
Syeda answered 1 year(s) , 5 month(s) ago

Find out the number of waves made by a Bohr electron in one complete revolution in its 4th orbit

No.of waves = circumference of electron orbit / wave length                           =2πr /λ
                          λ=h /mv
               No.of waves =2π/h *(mvr)
   ...

Asked by Tushara

May 1

  • 2 Answers
  • 1 Like
  • 22592 Views
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