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Although zirconium belongs to 4d transition series and hafnium to 5d transition series even them they show similar physical and chemical properties because

Posted by Ahuja Yadav 2 years, 5 months ago

CBSE > Class 12 > Chemistry

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.

ANSWER

Which of the following is not currectly matched with its IUPAC name

Posted by Shubham Baba 2 years, 5 months ago

CBSE > Class 12 > Chemistry

1 answers

Kashu Verma 2 years, 5 months ago

Plz tell your question correctly 😃.

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23. In an experiment if 29.6 g Ca(OH)2 in dissolve in water its prepare its aqueous solution of concentration 2M then determine the The volume of the solution?

Posted by Annu Kri 2 years, 5 months ago

CBSE > Class 12 > Chemistry

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

ANSWER

Chapter 11 excercise

Posted by Parth Vaishya 03 2 years, 5 months ago

CBSE > Class 12 > Chemistry

1 answers

Anshul Pratap Singh 1 year, 10 months ago

See ncert book 📚

ANSWER

Intext 2.6

Posted by Jai Vignesh 2 years, 5 months ago

CBSE > Class 12 > Chemistry

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...

ANSWER

How much electricity is required in coulomb for the oxidation of 1 mole of H2O to O2

Posted by Madhwan Pratap 2 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Preeti Dabral 2 years, 3 months ago

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

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

ANSWER

Maximum boiling azeotrope

Posted by Farman Malik 2 years, 5 months ago

CBSE > Class 12 > Chemistry

1 answers

Kanhaiya Saraswat 2 years, 5 months ago

Which show large negative deviation are of Maximum boiling Azeotrope

ANSWER

2CH3CHO Iupac name

Posted by Garima Sharma 2 years, 5 months ago

CBSE > Class 12 > Chemistry

4 answers

Akshatha E K 2 years, 4 months ago

Ethanal

Shalu Shrivastav 2 years, 5 months ago

Ethanal

Sachin Gupta 2 years, 5 months ago

Ethanal

Vishal Kaushik 2 years, 5 months ago

Methyl

ANSWER

2CH3CHO name

Posted by Garima Sharma 2 years, 5 months ago

CBSE > Class 12 > Chemistry

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

ANSWER

(i) In decreasing order of basic strength in aqueous solution : C_{2}*H_{5}*N*H_{2} ,(C 2 H 5 ) 2 NH, (C_{2}*H_{5}) 3 N

Posted by Falak Vaishya 2 years, 5 months ago

CBSE > Class 12 > Chemistry

1 answers

Anjan Karthi 2 years, 5 months ago

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

ANSWER

Difference between rate law and rate constant

Posted by R.Sasi Kumar 2 years, 6 months ago

CBSE > Class 12 > Chemistry

2 answers

Deeksha Yadav 2 years, 5 months ago

n is order of reaction

Deeksha Yadav 2 years, 5 months ago

R=kA ki power n K =R/A ki power n

ANSWER

Give a best topic for investigatory file..?

Posted by Kashish Rathore 2 years, 6 months ago

CBSE > Class 12 > Chemistry

1 answers

Chinu Rana 2 years, 5 months ago

Galvanic cell

ANSWER

Stabilisation of +2 oxidation state

Posted by Avaneesh Rao 2 years, 3 months ago

CBSE > Class 12 > Chemistry

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.

ANSWER

Kisi abhikriya Ki Ardh aayu sandrata ki Ghan Hoti Hai To abhikriya Ki Kothi bataiye

Posted by Rajesh Patel Rajesh 2 years, 6 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

What is the formula of E.A.N

Posted by Ashish Yadav 2 years, 6 months ago

CBSE > Class 12 > Chemistry

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

3Thank You

Anmol Tomar 2 years, 6 months ago

Jshshf

3Thank You

ANSWER

6gm of urea and 9gm of glucose are dissolved in in 300 gm of water find the boiling point of solution

Posted by Mukti Bhatti 2 years, 3 months ago

CBSE > Class 12 > Chemistry

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,

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

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

ANSWER

Explain postulates of valency bond theory of complex compounds and explain the following molecules coordination compound by valenc bond theory on the hybridization 1 and second inner and outer orbital and paramagnetism low spin and high spin

Posted by Akansha Rathod 2 years, 6 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

व्हाट आर कोलिगेटिव प्रॉपर्टी डिफाइन ऑस्मोटिक प्रेशर एंड इट्स रिलेशन

Posted by Neeraj Yadav 2 years, 6 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

General characteristics of Transical with reason?

Posted by Anoubam Varun 2 years, 6 months ago

CBSE > Class 12 > Chemistry

1 answers

Neeraj Yadav 2 years, 6 months ago

What kr the chiral compound?give example

ANSWER

Posted by Manas Vichare 2 years, 6 months ago

CBSE > Class 12 > Chemistry

1 answers

Kashu Verma 2 years, 5 months ago

What?????

ANSWER

Two elements A and B form a cubic crystal.atoms A are present on the corners as well as on the face centre while atoms B are present on the edge centers as well as on body centre if all the atoms along one of the axes passing through face centre are removed what is the simplest formula of the compound

Posted by Moirangthem Jenifer Devi 2 years, 6 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Sir, I need assertion reason question.

Posted by S R Jayakarthi 2 years, 6 months ago

CBSE > Class 12 > Chemistry

1 answers

Kaif Khan 2 years, 6 months ago

Give me your whatsapp no I can give u

ANSWER

What is the colour of potassium cromate

Posted by Kaif Khan 2 years, 6 months ago

CBSE > Class 12 > Chemistry

2 answers

Kaif Khan 2 years, 6 months ago

Thanks but I know

Megha . 2 years, 6 months ago

Yellow

ANSWER

Give an example of the pseudo - first reaction

Posted by Aditya Yadav 2 years, 6 months ago

CBSE > Class 12 > Chemistry

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

ANSWER

Write the IUPAC name of Na2[Ni(EDTA)]

Posted by Nikhil Dubey 2 years, 6 months ago

CBSE > Class 12 > Chemistry

1 answers

Wagisha Singh 2 years, 6 months ago

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

ANSWER

Convert nitrobenzene to benzoic acid

Posted by Pearl . 2 years, 6 months ago

CBSE > Class 12 > Chemistry

1 answers

Kaif Khan 2 years, 6 months ago

It is not theoratical concept it need to solved out

ANSWER

Suggest a metal that can be used for Cathodic protection of iron against rusting.

Posted by Riya Modak 2 years, 6 months ago

CBSE > Class 12 > Chemistry

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.

ANSWER

Meaning of chemical kinetics

Posted by Kajal Sahu 2 years, 6 months ago

CBSE > Class 12 > Chemistry

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.

ANSWER

Explain osmosis and osmotic pressure

Posted by Eni Gidwani 2 years, 6 months ago

CBSE > Class 12 > Chemistry

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.)