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  • 1 answers

Meemansha Srivastava 2 years, 5 months ago

As we go down the group the size of the atoms should increase. This trend is seen till 4d series. In 5d series the electrons fill in the penultimate shell i.e in the d subshell. The sheilding effect by the electrons in the d subshell is less than the attractive force between the electrons in the last subshell and the increasing nuclear charge. Thus the size of the atom reduces (This phenomenon is called as lanthanoid contraction). The expected increase in size of the 5d series is compensated by lanthanoid contraction and hence 4d and 5d series have almost the same size resulting them to have similar physical and chemical properties.
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Kashu Verma 2 years, 5 months ago

Plz tell your question correctly 😃.
  • 2 answers

Anjan Karthi 2 years, 5 months ago

Molar mass of Ca(OH)2 = 40 + (1 + 16) × 2 = 40 + 34 = 74 g.// Therefore, Molarity = W/MV. V = W/M × Molarity = 29.6/2 × 74 = 0.2 L = 200 mL.//

Shubham Baba 2 years, 5 months ago

Which of the following is not correctly matched with its IUPAC name
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Anshul Pratap Singh 1 year, 10 months ago

See ncert book 📚
  • 1 answers

Kashu Verma 2 years, 5 months ago

Solubility of H2S gas =0.195m 0.195 mole in 1kg of solvent= 1000g 1000/8=55.55moles Therefore, xH2S = 0.195/0.195+55.55=0.0035 Pressure at STP=0.987bar Applying Henry's law, PH2S=KH×XH2S KH=PH2S/XH2S= 0.987/0.0035=282bar...
  • 1 answers

Preeti Dabral 2 years, 3 months ago

{tex}\mathrm{H}_2 \mathrm{O} \rightarrow 2 \mathrm{H}^{+}+\frac{1}{2} \mathrm{O}_2+2 \mathrm{e}^{-}{/tex}

Oxidation of one mole of water will require 2×96500=1.93×105C.

  • 1 answers

Kanhaiya Saraswat 2 years, 5 months ago

Which show large negative deviation are of Maximum boiling Azeotrope
  • 4 answers

Akshatha E K 2 years, 5 months ago

Ethanal

Shalu Shrivastav 2 years, 5 months ago

Ethanal

Sachin Gupta 2 years, 6 months ago

Ethanal

Vishal Kaushik 2 years, 6 months ago

Methyl
  • 3 answers

Priyanshu Patel 2 years, 4 months ago

2 acetaldehyde

Ankush Dahiya 2 years, 5 months ago

Ethanal

Aniket . 2 years, 5 months ago

2 methal
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Anjan Karthi 2 years, 6 months ago

(C2H5)2NH greater than (C2H5)3N greater than C2H5NH2.
  • 2 answers

Deeksha Yadav 2 years, 6 months ago

n is order of reaction

Deeksha Yadav 2 years, 6 months ago

R=kA ki power n K =R/A ki power n
  • 1 answers

Chinu Rana 2 years, 5 months ago

Galvanic cell
  • 1 answers

Preeti Dabral 2 years, 3 months ago

The relative stability of the +2 oxidation state increases on moving from top to bottom. This is because on moving from top to bottom, it becomes more and more difficult to remove the third electron from the d-orbital.

  • 3 answers

Naman Sharma 2 years, 5 months ago

EAN = atomic number - oxidation state × 2 coordination number

Mili Singh 2 years, 6 months ago

Effective Atomic Number

Anmol Tomar 2 years, 6 months ago

Jshshf
  • 1 answers

Preeti Dabral 2 years, 3 months ago

The boiling point of the solution is 273.41 k

 

GIVEN

Weight of urea = 6 grams

weight of Glucose = 9 grams.

Weight of water = 300 grams

 

TO FIND

The boiling point of the solution.

 

SoOLUTION

We can simply solve the given problem as follows-

 

To calculate the boiling point of the solution, we will apply the following formula -

 

∆Tₒ = Kb× b × i (eq 1)

 

Where,

∆Tₒ = boiling point elevation

Kb = ebullioscopic constant of the solvent ( kb = o.515 kg/mol)

b = molality of the solute

i = van't Hoff factor of solute ( since urea and glucose are non-ionic compounds, so, i= 1)

 

We know that,

 

Boiling point elevation is defined as :

 

ΔTₒ = T₁ - T ........(eq2)

 

where,

T₁ = boiling point of the solution

T = boiling point of the solvent (T = 273.15 k of water)

 

Now,

{tex}\begin{aligned} & \text { number of moles of urea }=\frac{\text { given weight of urea }}{\text { molar mass of urea }} \\ & = \\ & \frac{6}{60}=0.1 \text { moles } \\ & \text { number of moles of glucose }=\frac{\text { given weight of glucose }}{\text { molar mass of glucose }} \\ & =\frac{9}{180}=0.05 \text { moles } \\ & \text { Total moles of solute }=0.1+0.05=0.15 \text { moles } \\ & \text { molality of solute }(b)=\frac{\text { moles of solute }}{\text { mass of solvent in } \mathrm{kg}} \\ & b=\frac{0.15 \times 1000}{300} \\ & b=0.5 \mathrm{M} \end{aligned}{/tex}

putting the values in ( eq 1) we have

ΔTₒ = 0.512 × 0.5 × 1

ΔTₒ = 0.26 k

Now, putting the value of ΔTₒ in (eq 2)

ΔTₒ = T₁ - T

0.26 = T₁ - 273.15

T₁ = 273.15 + 0.26

T₁ = 273.41 k


Hence, The boiling point of the solution is 273.41 k

  • 1 answers

Neeraj Yadav 2 years, 6 months ago

What kr the chiral compound?give example
I
  • 1 answers

Kashu Verma 2 years, 5 months ago

What?????
  • 1 answers

Kaif Khan 2 years, 6 months ago

Give me your whatsapp no I can give u
  • 2 answers

Kaif Khan 2 years, 6 months ago

Thanks but I know

Megha . 2 years, 6 months ago

Yellow
  • 3 answers

Rahul Ravi 2 years, 5 months ago

C12H22O11 + H2O → C6H12O6 + C6H12O6

Megha . 2 years, 6 months ago

Hydrolysis of ester

Kaif Khan 2 years, 6 months ago

Hydrolysis of easter
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Wagisha Singh 2 years, 6 months ago

Disodium ethylenediamminetetraacetatonickel(II) is the IUPAC name of Na 2 [ Ni ( EDTA ) ] .
  • 1 answers

Kaif Khan 2 years, 6 months ago

It is not theoratical concept it need to solved out
  • 1 answers

Pearl . 2 years, 6 months ago

Riya.. A metal which is more electropositive than iron such as Al , Zn , Mg can be used in cathodic protection of iron against rusting.
  • 3 answers

The Thakur Shahab 2 years, 6 months ago

It is the branch of physics which help about rate of reaction factor which affect rate of reaction

Kaif Khan 2 years, 6 months ago

it is the branch of physical chemistry which deal with 1) rate of reaction (2) factor which affect rate of reaction( 3) mechanism of reaction

Pearl . 2 years, 6 months ago

Chemical kinetics, also known as reaction kinetics, is the branch of physical chemistry that is concerned with understanding the rates of chemical reactions. It is to be contrasted with chemical thermodynamics, which deals with the direction in which a reaction occurs but in itself tells nothing about its rate.
  • 2 answers

The Thakur Shahab 2 years, 6 months ago

The process in which solvent move towards solution particle through semi permiable membrane is called osmosis The external hydronic pressure exert to solution side which just stop the osmosis is called osmotic pressure

Sachin Sharma 2 years, 6 months ago

The movement of solute molecules from higher concentration to lower called osmosis The pressure that has to applied to stop movement of molecules . Yet when it is too greater than Reverse osmosis occurs (R.O.)

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