CBSE > Class 12 > Chemistry | CBSE Board | Homework Help

The most commonly used version of Henry's law is: "The partial pressure of a gas in vapour phase (p) is proportional to the mole fraction of the gas (χ) in a solution."

p ∝ χ

p =K_H χ

Where K_H = Henry's law constant.

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ANSWER

In which condition ∆G=0 and E°cell=0 ??

Posted by Hariom Singh 6 years, 7 months ago

CBSE > Class 12 > Chemistry

2 answers

Ashish Kumar 6 years, 7 months ago

At ideal solution conditions

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Sujeet Vishwakarma 6 years, 7 months ago

At equilibrium ∆G=0 And E°cell =0

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ANSWER

Why dilute sulphuric acid is unable to react with unreactive metals?

Posted by Vicky Singh 6 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 6 years, 7 months ago

Metals as per their activity series react with acids to produce salt and hydrogen. Un-reactive metals like Cu, Ag, Au are below hydrogen in reactivity series so cannot displace hydrogen as they are less reactive. Acids contain hydrogen which is the cation of the compound so to react the metals should be able to displace hydrogen but they are not able to do so due to their unreactive property.

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ANSWER

By the way,, I WANT TO ASK THAT KON KON UNACADEMY JEE KE USERS HAI...

Posted by Aman Kumar 6 years, 7 months ago

CBSE > Class 12 > Chemistry

4 answers

Muskan .. 6 years, 7 months ago

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Aman Kumar 6 years, 7 months ago

?nice

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???? S.M. Sachin ???? 6 years, 7 months ago

Bro we are from Alakh sir PW

2Thank You

Anuj Maurya 6 years, 7 months ago

I am....

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ANSWER

Why pcl5 is more stable than pcl3 ?

Posted by Siya Jain 6 years, 7 months ago

CBSE > Class 12 > Chemistry

2 answers

Sajid Ali 6 years, 7 months ago

Due to the presence of a lone pair

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Emblem Newtonian 6 years, 7 months ago

PCl5 has bonds of different lengths - specifically axial bonds which are longer than equatorial bonds. It decomposes into PCl3 and Cl2 on heating. ... My opinion wise, PCl3 is more stable as its P is holding 3 Cl atoms.

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ANSWER

Could someone please suggest me good ideas for investigatory project?

Posted by Navdeep Gill 6 years, 7 months ago

CBSE > Class 12 > Chemistry

3 answers

Prikshit Jangra 6 years, 7 months ago

Bro there is an entire list of topics given in the cbse syllabus. Just pick one of them and google it. You'll get a whole lot of already prepared PDFs on the topic. Just to make your job easy. Best of luck

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Aman Kumar 6 years, 7 months ago

By the way...i have ask about this investigatory that...kya ess project se viva bhi pucha jayega...air ye total project +viva hai kitne marks ka

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Ďãřşháñăã Yadav ? ? ? 6 years, 7 months ago

mine is determination of content of cold drinks. u can get various projects on Google.

3Thank You

ANSWER

Zero order

Posted by Prachi Singh 6 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Sia ? 6 years, 7 months ago

In some reactions, the rate is apparently independent of the reactant concentration. The rates of these zero-order reactions do not vary with increasing nor decreasing reactants concentrations. This means that the rate of the reaction is equal to the rate constant, k, of that reaction.

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ANSWER

Which chemistry refrence book is better for class 12.??

Posted by Vinay Ranjan 6 years, 7 months ago

CBSE > Class 12 > Chemistry

2 answers

Deepak Jindal 6 years, 7 months ago

NCERT

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Ďãřşháñăã Yadav ? ? ? 6 years, 7 months ago

every one have different opinion according to their understanding level . some suggest pradeep nd some suggest modern but meri maan dono same hai koi bhe le le. baaki ncert toh kerni he hai... baad mein sample paper uskey liye Arihant best hai .... u like na le le na bus.

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ANSWER

P centerd

Posted by Prianjal Panwar 6 years, 7 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Natural blood has not been synthesized so war.why?

Posted by Rohit Singh 6 years, 7 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Extent of physisorption of gas increases with ____________ (a)increase in temperature (b)decrease in temperature (c)decrease in surface area of adsorbent (d)decrease in strength of van der waals force

Posted by Innocent Roaster 6 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Badrika Badnaik 6 years, 7 months ago

(b)

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ANSWER

What is the arrhenius equation

Posted by Himanshu Arya 6 years, 7 months ago

CBSE > Class 12 > Chemistry

2 answers

Himanshu Arya 6 years, 7 months ago

Thankyou

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Yogita Ingle 6 years, 7 months ago

Arrhenius equation

The formula used to calculate the energy of activation and justify the effect of temperature on rate of reaction is called Arrhenius Equation.
It is given by the formula,

K = A e^-Ea/RT

Where,

k = Rate constant

A= Frequency factor

e = mathematical quantity

E_a= activation energy

R = gas constant

T = kelvin temperature

ln K = ln A – Ea/(2.303RT)

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ANSWER

What is the adsorption and adsorbent

Posted by Himanshu Arya 6 years, 7 months ago

CBSE > Class 12 > Chemistry

3 answers

Badrika Badnaik 6 years, 7 months ago

adsorbent means the substance on which another substance get accumulated or get adsorbed

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Badrika Badnaik 6 years, 7 months ago

the phenomenon of accumulation of one substance on the surface of another substance is called adsorption

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Yogita Ingle 6 years, 7 months ago

The dirt staying on the surface of the skin as a layer is termed as adsorbtion.

Now consider applying soap solution to the shirt containing dirt. The soap solution is absorbed by the fabric and does not stay on the fabric as a layer. This is called absorption.

Adsorption

Adsorption is the phenomenon of attracting and retaining molecules of a substance on the surface of a solid (or liquid) resulting as a higher concentration of molecules only on the surface.

Adsorbent- the surface on which adsorption takes place
Adsorbate- the substance which is adsorbed

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ANSWER

Numerical

Posted by Jyoti Rani 6 years, 7 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

1- O-ClC6H4CH2CH.Br.CH3 2- HC---C-CH2-Br 3- (p-ClC6H4)2CHCCl3 Iupac name

Posted by Monty Chaturvedi 6 years, 7 months ago

CBSE > Class 12 > Chemistry

2 answers

Vivek Kumar 6 years, 7 months ago

Question galat hai

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Lovejeet Singh 6 years, 7 months ago

?????

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ANSWER

CH3CH=C(CH3).CH2Br Iupac name

Posted by Monty Chaturvedi 6 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Vivek Kumar 6 years, 7 months ago

1-bromo-2-methyl but-2-ene. And bromo ka b capital letter me hoga

1Thank You

ANSWER

Define emf.

Posted by Stym Shukla 6 years, 7 months ago

CBSE > Class 12 > Chemistry

2 answers

Yogita Ingle 6 years, 7 months ago

Emf(electromotive force) of the cell drives the current carriers to move in a specific direction.
This Emf causes positive and negative charges to flow in a specific direction. As a result current is generated.
Emf is a misnomer.
This means from the name it suggests it is a force but actually it is not.It is the potential difference between the two electrodes.
It is known as force because it acts as initial force to start the flow of charge.
Emf is defined as maximum work done per unit charge to take charge from one point to another.
It can be also defined as maximum potential difference between (+ive) and (-ive) electrodes of the cell in an open circuit.
Emf provides an energy which does the work to move the charge from one point to another.
As there is potential difference between the two electrodes the charges will flow.

1Thank You

Ďãřşháñăã Yadav ? ? ? 6 years, 7 months ago

EMF stands for electro motive force it is the difference b/w the electrode potentials of the two electrodes of the cell.

2Thank You

ANSWER

Calculate the emf of the cell for the following cell Mg/Mg++(0.1M)//Cu++/Cu E°cu++/cu=0.34v E°mg++/mg=-2.37v

Posted by Neha Kumari 6 years, 7 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

What is Nernst equation

Posted by Alok Yadav 6 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Ashwanisalgotra 89 6 years, 7 months ago

E cell=E°cell - 2.303RT/nF log[M (solid)]/[M™]

1Thank You

ANSWER

Nurst equation

Posted by Alok Yadav 6 years, 7 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Allotropy of nitrogen and bismuth

Posted by Bishal Biswas 6 years, 7 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Where is the answer of intext questions of class 12, chemistry, electrochemistry???

Posted by Yasir Ansari 6 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Aman Kumar 6 years, 7 months ago

Go to the chemistry option => select the chapter => click on the ncert solution, exmplar, extra qn.ect........ There u can get those questions if it is there...

0Thank You

ANSWER

Two liquid A and B have P°A and P°B in the ratio 1:3 and the ratio of number of moles of A and B in liquid phase are 1:3 then find mole fraction of 'A' in vapour phase in equilibrium with the solution.

Posted by Ďãřşháñăã Yadav ? ? ? 6 years, 7 months ago

CBSE > Class 12 > Chemistry

3 answers

Ďãřşháñăã Yadav ? ? ? 6 years, 7 months ago

tanQ.... I don't need image of this as it is clear. ✌️

1Thank You

Aman Kumar 6 years, 7 months ago

Just check the arrangements ....u may have confusion ....but u know..thia app is lack of image facility.......

1Thank You

Aman Kumar 6 years, 7 months ago

According to question, p°a/ p°b= 1/3...........(1) ,,,, n1/n2= 1/3......(2) from eq(2)....x1= n1/n1+n2= 1/1+3=1/4.........here we know, x1+x2 =1.....=> x2=1-x1......(3)..... Ptotal= p°1x1+p°2x2...........= P°1(3-2x1)........(4)..........y1= p1/ptotal = p°1x1/ p°1(3-2x1)....= x1/3-2x1...= 1/4/ 3-2(1/4) ...= 1/10

1Thank You

ANSWER

Why molar conductivity increses on dilution?

Posted by Ankita Pant 6 years, 7 months ago

CBSE > Class 12 > Chemistry

6 answers

Aman Kumar 6 years, 7 months ago

Nice one?

0Thank You

Ďãřşháñăã Yadav ? ? ? 6 years, 7 months ago

ohh this the correct way of answering thanks.

1Thank You

Sudarshan Sharma 6 years, 7 months ago

Actually molar conductivity =K*volume here Volume is a more dominating factor then kapa. Kapa decreases with increase in volume ( as no of ions per unit volume becomes less) but volume dominates and it increases more than decrease of kapa so overall molar conductivity increases.

2Thank You

Ďãřşháñăã Yadav ? ? ? 6 years, 7 months ago

on increasing the dilution conductivity of solution decreases it is so becoz on increasing the dilution the no. of ion responsible for current decreases.

0Thank You

Ankita Pant 6 years, 7 months ago

So what about normal conductivity

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Ďãřşháñăã Yadav ? ? ? 6 years, 7 months ago

As the dilution increases the distance b/w the ions increases as a result Interionic interactions b/w the ion decreases. Hence the conductivity increases on the dilution

1Thank You

ANSWER

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