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ANSWER

Define parts per million (PPM )

Posted by Naveen Kumar 6 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Gaurav Seth 6 years, 8 months ago

Parts per million can be defined as the ratio of number of parts of the component to the total number of parts of all components of the solution multiplied by 106.
It is denoted by ppm.
It is used to express concentration of a solution where solute is present in trace For instance, concentration of pollutants in water or atmosphere is expressed in terms of g mL–1 or ppm.
Mathematically,

For example, let 0.0005g of NaCl be dissolved in 100mL of water then parts per million =

4Thank You

ANSWER

Identify oxidant and reductant in following zn+2hcl=zncl2+h2

Posted by Parikshit Jawanjal 6 years, 9 months ago

CBSE > Class 12 > Chemistry

1 answers

Naveen Kumar 6 years, 8 months ago

Cl redictant

ANSWER

Side book me pradeep ki book kaisi hoti h

Posted by Vanya Singh 6 years, 9 months ago

CBSE > Class 12 > Chemistry

2 answers

Hritik Kumar 6 years, 8 months ago

Best

Aditya Gupta 6 years, 9 months ago

I don't think it would be good

ANSWER

Chemistry ke liye NCERT book sufficient he ya any other book???plzz answer

Posted by Mrutyunjay Khatua 6 years, 9 months ago

CBSE > Class 12 > Chemistry

4 answers

Hritik Kumar 6 years, 8 months ago

Ncert is enough and suggest the 10 year's paper then you will got 95+

Aditya Gupta 6 years, 9 months ago

Ncert is more than enough , I havenever been able to remember the whole p , d and f block simultaneously!!!!

Ram Ditta 6 years, 9 months ago

If u read ncert only....u will get very good marks?

Satyam Siwam 6 years, 9 months ago

Ncert is enough

ANSWER

Phycs vallh told that solid state have been remove

Posted by Vanya Singh 6 years, 9 months ago

CBSE > Class 12 > Chemistry

2 answers

Astha Dewangan 6 years, 9 months ago

Yes solid state remove from the syllabus of class 12th

3Thank You

Ayush Verma 6 years, 9 months ago

Yes

ANSWER

It is true that solid state have been remove according to new syllabus

Posted by Vanya Singh 6 years, 9 months ago

CBSE > Class 12 > Chemistry

4 answers

Hritik Kumar 6 years, 9 months ago

Yes

Ayush Verma 6 years, 9 months ago

And another small change has been done in p block elements chapter.

Astha Dewangan 6 years, 9 months ago

Yes

3Thank You

Ayush Verma 6 years, 9 months ago

ANSWER

Applications of Henry's law

Posted by Harry Dhillon 6 years, 9 months ago

CBSE > Class 12 > Chemistry

2 answers

Priyanshu Saini 6 years, 9 months ago

It also helps to reduce preesure of oxygen gas in gas cylinder of divers.

Astha Dewangan 6 years, 9 months ago

1)cold drink shield at high pressure 2)aquatic animals more comfortable in cold water rather than hot water. 3)anoxia at high altitude pressure is low

ANSWER

Kya jarrori h ki ncert book se hi padhna

Posted by Vanya Singh 6 years, 9 months ago

CBSE > Class 12 > Chemistry

4 answers

Hritik Kumar 6 years, 9 months ago

Yes

Ďãřşháñăã Yadav ? ? ? 6 years, 9 months ago

NCERT is boss dude..?.. approx 80% of the exam based on NCERT concept... as said by experienced teachers... ?

Ayush Verma 6 years, 9 months ago

But prepare ncert questions

Ayush Verma 6 years, 9 months ago

ANSWER

New syllabus ka site kya h Bata do koi

Posted by Akash Choudhary Dav Gandhinagar 6 years, 9 months ago

CBSE > Class 12 > Chemistry

1 answers

Ayush Verma 6 years, 9 months ago

Www.cbseacademic.nic.in

ANSWER

At what PPM Concentration water is said to be hard water?

Posted by Punita Tomar 6 years, 9 months ago

CBSE > Class 12 > Chemistry

1 answers

Punita Tomar 6 years, 9 months ago

Answer please?

ANSWER

The density of solution containing 13%by mass of sulphuric acid is 1.09g/ml. Calculate the molarity and normality

Posted by Neha Ojha 6 years, 9 months ago

CBSE > Class 12 > Chemistry

1 answers

Priyanka Narang 6 years, 9 months ago

Molarity= given mass/molar mass × 1000/vol of sol in litres so the formula can also be written as-----d×%×10/molar mass so u can apply this formula and can find molarity.. That is--1.09×10×13/98 and u can collect ur answer

3Thank You

ANSWER

What is amphoteric

Posted by Shiv Shiv 6 years, 9 months ago

CBSE > Class 12 > Chemistry

2 answers

Hritik Kumar 6 years, 9 months ago

Those oxide which shows the charteristics of basics as well as acids is called amphoteric oxide

Yakshi Baliyan 6 years, 9 months ago

jo acid aur base dono ke saath react krkey compound bana sakey

5Thank You

ANSWER

Can u pls tell me help book other than pradeep for boards. ????

Posted by Ananya Bhardwaj 6 years, 9 months ago

CBSE > Class 12 > Chemistry

6 answers

Priyanshu Saini 6 years, 9 months ago

ALL IN ONE OR SHIVDAS FOR PHYSICS OR SL. ARORA

Mansi Sharma 6 years, 9 months ago

Pradeeps for chemistry , sl arora for physics and xam idea also for solving què and for maths RD ...enough he !!!

Akash Choudhary Dav Gandhinagar 6 years, 9 months ago

Ncert padho Side book kavi nhi banane ka time milega

Ayush Verma 6 years, 9 months ago

Abc modern publication

Satyam Siwam 6 years, 9 months ago

Rajeev bansal's SBPD

Ashish Kumar 6 years, 9 months ago

Comprehensive

ANSWER

Why there is only a single compartment in lead storage battery unlike other electrochemical cells having 2 cells

Posted by Nidhi Jha 6 years, 9 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Can u tell me which chemistry book better for board exam

Posted by Vanya Singh 6 years, 9 months ago

CBSE > Class 12 > Chemistry

2 answers

Sayeda Iram Ateeq 6 years, 9 months ago

Only NCERT is sufficient for CBSE board!!!

Adarsh Deep Gupta 6 years, 9 months ago

NCERT and Pradeep also

ANSWER

Is solid state is in class 12th or not?!

Posted by Isha Vishwakarma 6 years, 9 months ago

CBSE > Class 12 > Chemistry

1 answers

Ayush Verma 6 years, 9 months ago

Not

4Thank You

ANSWER

If the solubility of H2S in water at STP is 0.195 m, calculate Henry's law constant.

Posted by Mohammad Jawad 6 years, 9 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Define the term amorphous .give a few examples

Posted by Narendra Nimbalkar 6 years, 9 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 6 years, 9 months ago

Term ‘amorphous’ means no form i.e irregular shape.Solids which consists of particles of irregular shape are called amorphous solids.The constituent particles in such solids has only short range order.Glass,rubber and plastics are some examples of amorphous solids.

ANSWER

Is solid state chapter 1has been deleted frnds

Posted by Ayushmaan Yaduvanshi 6 years, 9 months ago

CBSE > Class 12 > Chemistry

1 answers

Ayush Verma 6 years, 9 months ago

Yes

4Thank You

ANSWER

Haloalkanes though polar in nature they are immiscrible with water

Posted by Mukesh Kumar 6 years, 9 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

The solid state chapter can be remove for 2019-2020

Posted by Priyanshu Sharma 6 years, 9 months ago

CBSE > Class 12 > Chemistry

1 answers

Prashant Singh 6 years, 9 months ago

yes this news is right

ANSWER

CH2=CH-CH2-OH -------> CH2=CH-CH(OH)-CH3

Posted by Ishita Chatterjee 6 years, 9 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Which chemistry book is best for board exam 2019-20

Posted by Rahul Yadav 6 years, 9 months ago

CBSE > Class 12 > Chemistry

4 answers

Sayeda Iram Ateeq 6 years, 9 months ago

Only and only NCERT!!!!

Tushar Kumar 6 years, 9 months ago

NCERT books are best, exactly same questions will come in board exam

Ashiq Mansoori 6 years, 9 months ago

Ncert especially inorganic chemistry

Niranjan Rathore 6 years, 9 months ago

NCERT

ANSWER

Please give me class 12 chemistry syallbus 2019-20 with mark scheme (quick)

Posted by Rahul Yadav 6 years, 9 months ago

CBSE > Class 12 > Chemistry

1 answers

Amit Arora 6 years, 9 months ago

http://www.cbseacademic.nic.in/curriculum.html

ANSWER

what is the interstitials and F centres

Posted by Himanshu Arya 6 years, 9 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

What is the schottky defect ,frenkel defect

Posted by Himanshu Arya 6 years, 9 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

new syllabus for chemistry 2019-20

Posted by Ritesh Ranjan 6 years, 9 months ago

CBSE > Class 12 > Chemistry

1 answers

Ayush Verma 6 years, 9 months ago

U will get it after 5-6 days

ANSWER

Define boiling point of a liquid.

Posted by Shakshi Rana 6 years, 9 months ago

CBSE > Class 12 > Chemistry

3 answers

Tushar Kumar 6 years, 9 months ago

It is the temperature at which liquid starts boiling

Himanshu Arya 6 years, 9 months ago

The boiling point of a substance is the temperature at which the vapor pressure of a liquid equals the pressur surrounding the liquid and the liquid chang into vapor

Yogita Ingle 6 years, 9 months ago

The boiling point is the temperature at which the vapor pressure of a liquid equals the external pressure surrounding the liquid. Therefore, the boiling point of a liquid depends on atmospheric pressure. The boiling point becomes lower as the external pressure is reduced.

ANSWER

Why is ether not miscible in water

Posted by Shakshi Rana 6 years, 9 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 6 years, 9 months ago

It's a bit complicated in case of ethers. Ethers have lone pair of electrons on their oxygen, which allows them to establish hydrogen bonding with water molecules. Therefore, as long as these lone pairs are sufficiently exposed, ethers are water soluble. This exposure is maximum in case of cyclic ethers, and minimal in case of aliphatic (non-cyclic ethers). Therefore, cyclic ethers tend to be water soluble; whereas, aliphatic ethers are either not soluble at all or have minimal solubility (Aliphatic ethers with up to 3-4 carbons are water soluble to some extent). So, really, the solubility of ethers in water depends on the kind of the ether that we're talking about
But Mostly They are solube as they have lone pair