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

cell shrink... becoz hypertonic means less water more solute. which means if u placed these two cells in hypertonic solution water moves through higher concentration to lower concentration as a result cell shrink.

2Thank You

Aman Kumar 6 years, 8 months ago

Cell will swell up......kya answer yahi hai?.....maine try kiya hai....from my 9th class concept?....soo if I m wrong then surely correct me

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ANSWER

Why phosphine is weaker then ammonia. BiH3 is the strongest reducing agent among all hydrides. Phosphate has a lower boiling point then NH3 why. Though N exihibits plus 5 oxidation state why does it form pentahalide. Why N2 is less reactive at room temparature.

Posted by Rozlin Kabir 6 years, 8 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

A cell with N/50 kcl solution showed a resistance of 550 ohms at 25°c the specific conductivty of N/50 kcl at 25°c is 0.002768 per ohm per cm the cell filled with N/10 znso4 solution at 25°c shows a resistance of 72.18 ohms find the. CEll constant and molar cinductivity of znso4 solution

Posted by T D 6 years, 8 months ago

CBSE > Class 12 > Chemistry

2 answers

Ďãřşháñăã Yadav ? ? ? ✊ 6 years, 8 months ago

it get mess but hope u understand.. ? ✌️

1Thank You

Ďãřşháñăã Yadav ? ? ? ✊ 6 years, 8 months ago

here is your ➡️Given ➡️550 ohm. Specific conductivity = 0.002768 ohm⁻¹ cm⁻¹_____ Cell constant =specific conductivity × resistance = 0.002768 × 550 = 1.5224 .___Conductance for Znso4 =1/R =1/72.18 = 0.014 _____ Specific conductance = cell constant × resistance = 1.5224 × 0.014 = 0.021 . ________________________ Molar Conductance Λ = κ × 1000 / M. ____ ∵Molarity = Normality × n factor = (1/10) × 2 Molarity = 0.2 M___________ Λ = 0.021 × 1000 / 0.2 = 21/0.2 = 105.

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ANSWER

Project file on chemical kinetics

Posted by Jaspinder Singh Dhariwal 6 years, 8 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

In which of the following compounds nitrogen exhibits highest oxidation state. Options:1ammonia 2.N2H4 3.NH2OH 4.N3H

Posted by Prince Kumar 6 years, 8 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Is azeotropic mixtures in syllabus for 2020

Posted by Ankush Saini 6 years, 8 months ago

CBSE > Class 12 > Chemistry

2 answers

Priya Dharshini ? 6 years, 8 months ago

Yes it there...

1Thank You

Harsh Pahuja 6 years, 8 months ago

Yes

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ANSWER

What is polarisation?

Posted by Mohit Rathore 6 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Ananya Singh 6 years, 8 months ago

Polar means ki element me positive and negative dono charges ho.....non polar me koi charge present nhi hota???

4Thank You

ANSWER

0.1 mol of sugar was dissolved in 1 kg of water. The freezing point of solution was found to be 272.814k. what conclusion would you u draw about the molecular state of sugar? Kf for water is 1.86 k kg/mol

Posted by Ankika Halder 6 years, 8 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

What solid state full unit deleted

Posted by Amit Dhull 6 years, 8 months ago

CBSE > Class 12 > Chemistry

4 answers

Lily ☺ 6 years, 8 months ago

Yes of course it is deleted.

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Aman Kumar 6 years, 8 months ago

Yah....it is deleted

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Ďãřşháñăã Yadav ? ? ? ✊ 6 years, 8 months ago

yup it's deleted only for cbse not for neet and jee.

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Manika Gupta 6 years, 8 months ago

Yes solid state is deleted

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ANSWER

Which book is best to score 100 marks in chenistry

Posted by Sahib Singh 6 years, 8 months ago

CBSE > Class 12 > Chemistry

3 answers

Me Souhardee❤️ 6 years, 8 months ago

No book can make u able to score ? in chemistry aap khud ki ability pehchano and yes practise is mandatory aur rha swal book ka Sorry cheap line but quite useful sb padho phir sahi chuno??? Hope u get my point and yes lecture ni h yeh yrr plzzz

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Priya Dharshini ? 6 years, 8 months ago

First Ncert,arihant or examidea

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Manika Gupta 6 years, 8 months ago

NCERT is more than enough but along with ncert do support material....

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ANSWER

How shall I determine the major and minor products in the preparation of haloalkane from alkanes?

Posted by Aishwarya Nath 6 years, 8 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

What is hydrolysis

Posted by Rocky Das 6 years, 8 months ago

CBSE > Class 12 > Chemistry

2 answers

Anshu Priya 6 years, 8 months ago

There is a difference in hydration and hydrolysis means breaking of a substance in its ions in water while hydration means addition of water molecules. Hope that it will help you.

1Thank You

Pragati Gola 6 years, 8 months ago

Adding H2O

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ANSWER

17.4% w/v K2SO4 solution at 27 degree celsius is isotonic with 58.5% w/v NaCl solution at 27 degree celsius. If NaCl is 100% ionised what is the percent ionisation of K2SO4?

Posted by Tarun Choudhury 6 years, 8 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Calculate the SHP of ni²+/ni electrode if the cell potential of the cell ni/ni²+ (0.01M)||cu²+/cu is 0.59 given E°cu²+/cu=0.34v

Posted by Deepti Ekka 6 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogesh Yadav 6 years, 8 months ago

It's too simple

1Thank You

ANSWER

Is ncert book enough to score 95% in class 12th

Posted by Abhi Shek 6 years, 8 months ago

CBSE > Class 12 > Chemistry

2 answers

Ananya Singh 6 years, 8 months ago

according to present syllabus of cbse i think ncert is the best

2Thank You

Priya Dharshini ? 6 years, 8 months ago

No i think so.... max 90 u can score using ncert textbooks. Infact those questions would also be twisted... it is better to do more from other guides to know more and score more. In 10th if i would have done only ncert i wouldnt have scored 90 above...

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ANSWER

Calculate the Osmotic pressure of the solution containing 17.1 gram of Cane sugar in 500 gram of water at the 300 Kelvin density of the solution is 1.034 gram

Posted by Manish Kumar 6 years, 8 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

What is matrix ?? General priciples of extraction of metals jee topic...

Posted by Priya Dharshini ? 6 years, 8 months ago

CBSE > Class 12 > Chemistry

7 answers

Priya Dharshini ? 6 years, 8 months ago

Thanks mridula... nice name..

1Thank You

Priya Dharshini ? 6 years, 8 months ago

Thanks kumar...

1Thank You

Priya Dharshini 6 years, 8 months ago

Yes matrix is like other name of gangue....

1Thank You

Kumar Vishal Behera 6 years, 8 months ago

Hey Matrix of chemistry is impurities found in metal ore.

1Thank You

Yogesh Yadav 6 years, 8 months ago

Hello my dear frnds

1Thank You

Priya Dharshini ? 6 years, 8 months ago

I need for chemistry matrix... it is something related to gangue...

1Thank You

⚡?Chinmay?⚡ ⚡?Rathore?⚡ 6 years, 8 months ago

Matrix is an arrangement of number in a particular order?

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ANSWER

Two liquids A and B on mixing form an ideal solution. Their vapour pressures in the pure state are 200 and 100 mm respectively .What will be the mole fraction of B in the vapour phase in equilibrium with an equimolar solution of the two ?

Posted by Prakriti Rao 6 years, 8 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

IMPORTANT PREVIOUS YEAR BOARD QUESTION :Is it easier to catch fish in summer or in winter. Explain by giving reasons.

Posted by Harsh Pahuja 6 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Priya Dharshini ? 6 years, 8 months ago

In summer. Because in winter as the temperature decreases dissolved oxygen is more in water. But in summer as temperature increases dissolved amount of oxygen decreases so fishes come on top to make them survive so it is easy to catch fish in summer. Ya this is board value based question from chapter solution. I solved it yesterday only. Good question...?

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ANSWER

Can u say what concepts are deleted in chapter :p-block elements

Posted by R Meera Raghunaathan 6 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Harsh Pahuja 6 years, 8 months ago

In class 12th from chapter P-block nitrogen family has been deleted.

1Thank You

ANSWER

Value of STP?

Posted by Saurav Gupta 6 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

#¥Uvi Rana Rajput 6 years, 8 months ago

STP is defined as temperature of 273.15k and an absolute pressure of exactly 10^5 pa.

1Thank You

ANSWER

Name the type of electrochemical cell which doesn't contain salt bridge..?

Posted by Ragini Maurya 6 years, 8 months ago

CBSE > Class 12 > Chemistry

2 answers

Harsh Pahuja 6 years, 8 months ago

Hydrogen electrode cell

1Thank You

Manika Gupta 6 years, 8 months ago

I think there is no electrochemical cell bcz salt bridge acts as a circuit completer

1Thank You

ANSWER

Electric fluix

Posted by Divu Pandey 6 years, 8 months ago

CBSE > Class 12 > Chemistry

3 answers

Yogita Ingle 6 years, 8 months ago

Electric flux is the measure of flow of the electric field through a given area. Electric flux is proportional to the number of electric field lines going through a normally perpendicular surface.

0Thank You

Ragini Maurya 6 years, 8 months ago

The total no..of electric field lines Passes through any surface..normally..or perpendicularly then that Number of lines are called electric flux..It is Scalar quantity...

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H Mohammad Arshad 6 years, 8 months ago

Physics ch 1

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ANSWER

What is volatile and non volatile solute

Posted by Aaditya Rathore??? 6 years, 8 months ago

CBSE > Class 12 > Chemistry

3 answers

Aaditya Rathore??? 6 years, 8 months ago

Thanks yogita

0Thank You

Yogita Ingle 6 years, 8 months ago

A non-volatile solute does produce vapour at the boiling point of the solution. They have lower vapour pressure and higher boiling point.

Example: Sugar.

A volatile solute produces vapour at the boiling point of the solution. At the same temperature, they have higher vapour pressure than non-volatile solutes.

Examples: Alcohol, ether, mercury, and gasoline.

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Kumar Vishal Behera 6 years, 8 months ago

Volatile solute is the solute which evaporates faster.

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ANSWER

How can we know the higher freezing point among any two or more than two compounds??

Posted by Akarsh Gupta 6 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Akash Choudhary Dav Gandhinagar 6 years, 8 months ago

By association or dissociation

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ANSWER

How can we change Molality value of a solution into molarity value?? Answer fast...

Posted by Priya Dharshini ? 6 years, 8 months ago

CBSE > Class 12 > Chemistry

7 answers

Priya Dharshini ? 6 years, 8 months ago

Molality=Molarity×1000/(1000×density)-(molarity× molarmass)

1Thank You

Aman Kumar 6 years, 8 months ago

Other, method will may be little difficult.....I don't know well.........Hope that helps?

1Thank You

Aman Kumar 6 years, 8 months ago

Molarity= wt.of solute × 1000/molecular wt. × vol.of solution(ml)....... => Molarity= wt.of solute × 1000/mol.wt. × wt.of slovent(g)..... [Since, volume of sloution=wt. Of solute + wt.of solvent..... => Wt.of solvent= vol.of solution - wt.of solute.........Here , values of these quantities will be provided in the question]...... => From above we conclude that, .Molarity= molality....

2Thank You

Kumar Vishal Behera 6 years, 8 months ago

Please answer it if u know.

1Thank You

Priya Dharshini ? 6 years, 8 months ago

This is a theory question in which u have to derive a formula for molality using molarity.....it is 2014 board question.

1Thank You

Ankita Kumari 6 years, 8 months ago

Yha possible h

1Thank You

Ayushi Ayushi 6 years, 8 months ago

Is density given?