CBSE > Class 11 > Chemistry | CBSE Board | Homework Help

Because silicon nipples ate firmer and more durable then other nipples types since it is firmer they provide a good solid latch on your baby mouth and coupled with a wide base and they can mimic as a mother's breasts

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1. From where does ozone come in the photochemical smog? 2.On the basic of chemical reaction involved, explain how do chloroflurocarbons caves thinning of ozone layer in stratosphere. 3.what would be the harmful effects of improper management of industrial and diverted solid waste in a city? 4.Acid is known to contain some acid. Name these acids and where from they come in rain. 5.Ozone is a toxic gas and a strong oxidising agent even the its presence in the stratosphere is very important explain what would happen if ozone from region is completely removed. 6.Ozone is a gas heavier than air. Why does ozone layer not settle down near the earth. 7.Green house effect leads to global warming. Which substance are responsible for green house effect.

Posted by Amena Khatri 7 years, 11 months ago

CBSE > Class 11 > Chemistry

0 answers

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What U all are studying for chemistry? Did U all have question bank for chemistry . Or else learning only model of this year . can any say......... .

Posted by Mohammed Sameer 7 years, 11 months ago

CBSE > Class 11 > Chemistry

4 answers

Manjushree Hiremat 7 years, 11 months ago

Search properly no Atleast for last year model paper u will get

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Mohammed Sameer 7 years, 11 months ago

Did U have that last 5 year model .. but no model papers with me If have plz give me that model paper becoz it is not in Google also

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Manjushree Hiremat 7 years, 11 months ago

Take model question paper of last 5 years your lecturer must said u some important questions or topics according to me reactions of redox reaction lesson , laws of thermodynamics , ph and poh problems alkane alkenes alkane.....

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Mohammed Sameer 7 years, 11 months ago

Plz answer to this

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What is the importance of measuring BOD of water body?

Posted by Amena Khatri 7 years, 11 months ago

CBSE > Class 11 > Chemistry

0 answers

ANSWER

Inductive effects

Posted by Jai Prakash 7 years, 11 months ago

CBSE > Class 11 > Chemistry

1 answers

Ditya Roy Roy 7 years, 11 months ago

The displacement of sigma electron along a saturated C-chain. Whenever,an electron withdrawing group or electron donating group is present at the end of C-chain is called inductive effect. They are of two types - 1___ +I effect 2___ - I effect

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How many hyperconjugating structures are there in propene?

Posted by Diptarup Chakraborty 7 years, 11 months ago

CBSE > Class 11 > Chemistry

0 answers

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What is borazine? Why it is known as inorganic benzene?

Posted by Prashant Sangwan 7 years, 11 months ago

CBSE > Class 11 > Chemistry

2 answers

Vedant Modi 7 years, 11 months ago

It is the compound formed in the reaction Of boric acid with excess of ammonia . It is known as inorganic benzene due to its structure.

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Navpreet Kaur 7 years, 11 months ago

When diborane react with ammonia then it give borazene. It is also called inorganic benzene because its physical properties resemble with benzene and it is also iso-electronic with benzene

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Tommorow is My preboard plz Tell Important topics

Posted by Atul Sharma 7 years, 11 months ago

CBSE > Class 11 > Chemistry

1 answers

Manjushree Hiremat 7 years, 11 months ago

The reactions from redox reaction lesson problems from thermodynamics bohrs model lichatliers principle from equilibrium I know only these I hope it helps u

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Define Wurtz Reaction

Posted by Atul Sharma 7 years, 11 months ago

CBSE > Class 11 > Chemistry

1 answers

Prashant Sangwan 7 years, 11 months ago

An alkyl halide on reaction with sodium in the presence of dry ether to produce a symmetrical alkane having double the number of carbon atoms present in haloalkane.

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Cr2O2- + so2 - cr3+ so2 (acidic medium) half reaction method

Posted by Divyansh Verma 7 years, 11 months ago

CBSE > Class 11 > Chemistry

0 answers

ANSWER

What is crystal lattice of metal

Posted by Shreya Pahwa 7 years, 11 months ago

CBSE > Class 11 > Chemistry

0 answers

ANSWER

Atomic no. Of Silicon

Posted by Rohit Sharma 7 years, 11 months ago

CBSE > Class 11 > Chemistry

1 answers

Komalpreet Kaur 7 years, 11 months ago

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At 400 k temperature 200ml N2 has pressure 1.5 bar. Find the volume, weight in grams and number of molecules of N2 gas at STP .

Posted by Dhruvil Rana 7 years, 11 months ago

CBSE > Class 11 > Chemistry

1 answers

Hard Prajapati 4 years, 11 months ago

at 400k temperature 200ml n2 has pressure 1.5 bar f8nd v9lume of n2 gas at stp

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Elements that have vacant orbital afer bond formation?

Posted by Sumit Meena 7 years, 11 months ago

CBSE > Class 11 > Chemistry

0 answers

ANSWER

why NH3 has more dipole movement than NF3

Posted by Prabhugouda Kalakeri 7 years, 11 months ago

CBSE > Class 11 > Chemistry

2 answers

Himanshu Sharma 7 years, 11 months ago

Because morebond angle

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Ruchi Gupta 7 years, 11 months ago

<hr />

Between H and F, F is more electronegative than H.So in NH3 electrons are pulled towards N whereas in NF3 the electrons are pulled towards F. In NH3 the pull of electrons is in the direction of resultant dipole which makes it have more dipole moment than NF3

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A human adult breadthes in approx 0.50dm3 of air at 1 bar with each breadth . if an air tank holds 100dm3 of air at 200 bar ,how many breadths the tank will supply ?assume that the temperature is 37degree Celsius

Posted by Khushi Pratap 7 years, 11 months ago

CBSE > Class 11 > Chemistry

1 answers

Vedant Modi 7 years, 11 months ago

200

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Why in hydrogen spectrum different lines are obtained although it contains only one electron?

Posted by Divroop Singh Hundal 7 years, 11 months ago

CBSE > Class 11 > Chemistry

2 answers

Ashita Laxami 7 years, 11 months ago

It is because this spectrum is not made by only 1 hydrogen. It is made by many hydrogen atoms in which each election got excited to different levels thus we get many lines in hydrogen spectrum

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Prabhugouda Kalakeri 7 years, 11 months ago

number of electrons are not responsible for that

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Name any two radioactive s-block elements

Posted by Komalpreet Kaur 7 years, 11 months ago

CBSE > Class 11 > Chemistry

1 answers

Manjushree Hiremat 7 years, 11 months ago

Francium and radium

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What happen when we heated boric acid

Posted by Prashant Sangwan 7 years, 11 months ago

CBSE > Class 11 > Chemistry

1 answers

Manjushree Hiremat 7 years, 11 months ago

Boric acid is soluble in boiling water when we heat it above 170 degree C it further dehydrates and form metaboric acid Metaboric acid which is sparingly soluble in water it is heated upto or above 300 degree C It further dehydrates

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Limitations of wurtzz reaction

Posted by Abhishek Gupta 7 years, 11 months ago

CBSE > Class 11 > Chemistry

2 answers

Ashita Laxami 7 years, 11 months ago

@Odd no of alkanes can't be made from this reaction @Methane can't be made by this reaction

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Prashant Sangwan 7 years, 11 months ago

Unsymmetrical alkane cannot be produced by this method

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Define law of multiple proportion

Posted by Vishal Singh 7 years, 11 months ago

CBSE > Class 11 > Chemistry

1 answers

Vanshika Sharma 7 years, 11 months ago

When two elements combine with each other to form two or more than two compounds,the masses of one of the elements which combine with a fixed mass of the other.bear a simple whole number ratio to one another.

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Why gallium is less atomic radius then that of aluminum

Posted by Vaishali Khandelwal 7 years, 11 months ago

CBSE > Class 11 > Chemistry

1 answers

Vaishali Khandelwal 7 years, 11 months ago

It has 10-d configuration which have poor shielding effect. Hence ts effective nuclear charge is high which contracts the size.

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Suggest me best book for organic chemistry

Posted by Kriti Jaiswal 7 years, 11 months ago

CBSE > Class 11 > Chemistry

2 answers

Àñshul Shärmã 7 years, 11 months ago

Ncert

2Thank You

Omkar Darekar 7 years, 11 months ago

For JEE- P.Bahadur, GRB Books, Prakash Publications

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ANSWER

So is electropositivw

Posted by Kaushal Chauhan 7 years, 11 months ago

CBSE > Class 11 > Chemistry

0 answers

ANSWER

What is difference between calcination and roasting?

Posted by Sagar Meel 4 years, 6 months ago

CBSE > Class 11 > Chemistry

1 answers

Sia ? 4 years, 6 months ago

Calcination	Roasting
Calcination is a process in which ore is heated in the absence of air or air might be supplied in limited quantity	Roasting involves heating of ore lower than its melting point in the presence of air or oxygen.
Calcination involves thermal decomposition of carbonate ores.	Roasting is carried out mostly for sulfide minerals.
During calcination, moisture is driven out from an ore.	Roasting does not involve dehydrating an ore.
Carbon dioxide is given out during calcination	During roasting large amount of toxic, metallic and acidic compounds are released.

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