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ANSWER

What is the meaning of isotope

Posted by Hiral Gupta 6 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 6 years, 4 months ago

Elements having same atomic number but different atomic masses are known as Isotopes.

Example:

Carbon-12, Carbon-13, Carbon-14 are thee isotopes of carbon atom. Here 12, 13 and 14 are the atomic masses of isotopes of carbon respectively. Since, atomic number is the unique property of an atom, thus the atomic number of carbon is 6 even in the case of three types of carbon (isotopes)

¹²₆Carbon, ¹³₆Carbon, ¹⁴₆Carbon,

Hydrogen-1, Deuterium–2, Tritium-3 are three isotopes of hydrogen.

ANSWER

F block important questions

Posted by Mohit Sahu 6 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Sukriti Kalia 6 years, 4 months ago

Most important one is lanthanoid n actinoid contraction If you'll cover the ncert questions of this chapter then it'll be enough

ANSWER

What is Gattermann's Rex?

Posted by Gargee K 6 years, 4 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Project of chemistry

Posted by Shubham Verma 6 years, 4 months ago

CBSE > Class 12 > Chemistry

2 answers

Chetna Bhatt 6 years, 4 months ago

Or slideshare.com is a website in which you can find many handwritten or printed projects...just check it maybe it will help you

Chetna Bhatt 6 years, 4 months ago

Green chemistry

ANSWER

Hno3

Posted by Mayank Malve 6 years, 4 months ago

CBSE > Class 12 > Chemistry

2 answers

Deeya Singh 6 years, 4 months ago

It is a strong oxidising agent

Chetna Bhatt 6 years, 4 months ago

HNO3 is also known as nitric acid.. it is highly corrosive in nature..

ANSWER

What is the mean by bi-functional and tri- functional monomeric units

Posted by Aditya Kumar 6 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Chetna Bhatt 6 years, 4 months ago

Bi functional means having 2 functional grp in one monomer and tri functional means having 3 functional grp in one monomer

ANSWER

How do we do IUPAC names

Posted by Karuki Harden 6 years, 4 months ago

CBSE > Class 12 > Chemistry

3 answers

H Mohammad Arshad 6 years, 4 months ago

Study 11th organic chemistry

Sukriti Kalia 6 years, 4 months ago

Just follow some rules during the naming of compounds according to IUPAC system

Chetna Bhatt 6 years, 4 months ago

In organic chemistry or inorganic chem??? Can you please tell this...

ANSWER

How is DDT prepared????

Posted by Rukhsana Mannan 6 years, 4 months ago

CBSE > Class 12 > Chemistry

3 answers

Chetna Bhatt 6 years, 4 months ago

I have read this in my coaching module...

Rukhsana Mannan 6 years, 4 months ago

Is this answer given in textbook??

Chetna Bhatt 6 years, 4 months ago

DDT is prepared by reaction between chloro benzene and trichloro acetaldehyde in the presence of H2SO4

4Thank You

ANSWER

Williamsyntasis reactions

Posted by Neeraj Yadav 6 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 6 years, 4 months ago

Sodium or potassium alkoxides and phenoxides on treatment with alkyl halides form ethers. This is Williamson's synthesis reaction.

4Thank You

ANSWER

Other name of caprolactum???

Posted by Chetna Bhatt 6 years, 4 months ago

CBSE > Class 12 > Chemistry

3 answers

Vikas Kumar 6 years, 4 months ago

Exercise 2 ,intex question 2.8

Chetna Bhatt 6 years, 4 months ago

Ohh okk thank you?

Yogita Ingle 6 years, 4 months ago

Caprolactam (CPL) is an organic compound with the formula (CH₂)₅C(O)NH. This colourless solid is a lactam (a cyclic amide) of caproic acid.

3Thank You

ANSWER

Chapter wise mark allotment

Posted by Anto Xavier 6 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Chetna Bhatt 6 years, 4 months ago

Chapter 1+2+3+4=23 marks Chapter 5+6+7=19 marks Chapter 8+9+10+11+12+13+14=28 marks Maybe it will help you....

ANSWER

Uses of Argon

Posted by Ankit Gupta 6 years, 4 months ago

CBSE > Class 12 > Chemistry

2 answers

Ritika Yadav 6 years, 4 months ago

Used to provide inert atmosphere for extraction of metal and for welding filled in rectifiers . and radiovalves and fluorescent tube filled in electric bulb to avoid the combustion of fillaments

Yogita Ingle 6 years, 4 months ago

Argon is often used when an inert atmosphere is needed. It is used in this way for the production of titanium and other reactive elements. It is also used by welders to protect the weld area and in incandescent light bulbs to stop oxygen from corroding the filament.
Argon is used in fluorescent tubes and low-energy light bulbs. A low-energy light bulb often contains argon gas and mercury. When it is switched on an electric discharge passes through the gas, generating UV light. The coating on the inside surface of the bulb is activated by the UV light and it glows brightly.
Double-glazed windows use argon to fill the space between the panes. The tyres of luxury cars can contain argon to protect the rubber and reduce road noise.

ANSWER

Uses of krypton.

Posted by Ankit Gupta 6 years, 4 months ago

CBSE > Class 12 > Chemistry

2 answers

Yogita Ingle 6 years, 4 months ago

Krypton is used commercially as a filling gas for energy-saving fluorescent lights. It is also used in some flash lamps used for high-speed photography.
Unlike the lighter gases in its group, it is reactive enough to form some chemical compounds. For example, krypton will react with fluorine to form krypton fluoride. Krypton fluoride is used in some lasers.
Radioactive krypton was used during the Cold War to estimate Soviet nuclear production. The gas is a product of all nuclear reactors, so the Russian share was found by subtracting the amount that came from Western reactors from the total in the air.
From 1960 to 1983 the isotope krypton-86 was used to define the standard measure of length. One metre was defined as exactly 1,650,763.73 wavelengths of a line in the atomic spectrum of the isotope.

Chetna Bhatt 6 years, 4 months ago

It is used for trapping heat... Also used in filling the fluorescent tubes lights....

ANSWER

Convert propanone to propane

Posted by Harsh Upadhyay 6 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Chetna Bhatt 6 years, 4 months ago

Add NH2-NH2 + KOH + glycol as catalyst then propanone will convert into propane

ANSWER

Isopropyl. Alcohol react with pcl5

Posted by Zubair Khan 6 years, 4 months ago

CBSE > Class 12 > Chemistry

2 answers

Leo Arockiasamy 6 years, 4 months ago

ROH+PCL5givesRCl+POCL3+HCl

Chetna Bhatt 6 years, 4 months ago

Can you clear that what you are actually asking???

ANSWER

Which biomolecules act catalyst

Posted by Hitanshu Panwar Hitansu Panwar 6 years, 4 months ago

CBSE > Class 12 > Chemistry

5 answers

Deeya Singh 6 years, 4 months ago

Enzymes!

Ron Vineetahuja 6 years, 4 months ago

Enzymes

Ritika Yadav 6 years, 4 months ago

Enzymes

Chetna Bhatt 6 years, 4 months ago

PROTEIN

Anita Dahiya 6 years, 4 months ago

Proteins act as enzymes

ANSWER

Is 1-phenypropanone is also known as propiophenone

Posted by Shalini Joshi 6 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Chetna Bhatt 6 years, 4 months ago

Yes.. both are same Propiophenone or 1-phenyl propanone is aryl ketone

ANSWER

Which biomolecules act as catalysts?

Posted by Rajnesh Yadav 6 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Sejal Uniyal 6 years, 4 months ago

Enzymes are the biomolecules which act as catalysts.

ANSWER

Name reactions and tests will come from ncert 100% all are saying.. but there are few reactions and test not given in ncert but asked in board exam... so what to do if it comes lile that...

Posted by Priya Dharshini ? 6 years, 4 months ago

CBSE > Class 12 > Chemistry

17 answers

Priya Dharshini ? 6 years, 3 months ago

Thanks a lot.. it litrelly means a lot to me..???? litrelly u came this down to msg me.. my god.. thanks a lot.....no words to say.. thanks a lot..

Aman Kumar 6 years, 3 months ago

Hey priya, bahot muskil se etna down aaya hu scroll karte karte ?.. Happy birthday yaar????...ek baar maths section mai bhi jake dekh lena?

꧁≪Mämƭå ℭℏ۝ᑌĎℎàℜÿ? 6 years, 4 months ago

You are great..u understand feelings of everyone ..thanks?

Aman Kumar 6 years, 4 months ago

????...no need to say sorry ☺️...I understand....waise bhi confirm karna jaruri hai.... otherwise, yaha pata hi nhi chalta ki kon hai....?

꧁≪Mämƭå ℭℏ۝ᑌĎℎàℜÿ? 6 years, 4 months ago

Sorry bro..par confirm kar rahi thi

Aman Kumar 6 years, 4 months ago

???.. Don't mind behna, but sunn ke bahot ajib lag rha h ki tum sayad mujhe janti ho?? .......becz kuch months pehle ki hi baat h...but koi nhi....apni frnd darshana se puch lena ki....kya tum log aman naam ke kisiko jante ho??

Aman Kumar 6 years, 4 months ago

Mazak/ bezatti karne ka acha tarika hai meri choti behna??......mai wahi Aman hu jo apko samjhate raheta tha.....?.......

꧁≪Mämƭå ℭℏ۝ᑌĎℎàℜÿ? 6 years, 4 months ago

Aman..maybe i know u??

Aman Kumar 6 years, 4 months ago

Correct....?.....BTW, its not needed to tell uh as u all know that but then also......just work on the concept section.....after that ..no matter which type of question is coming in exam....u will be able to do that...☺️

3Thank You

Priya Dharshini ? 6 years, 4 months ago

OHh ya.. i take back my thank you..??? it was help full.. now there is no way to guess how the questions can be asked we need to do many more extra also.. which is out of syllabus..

Aman Kumar 6 years, 4 months ago

But I think , u all have forgotten....what I use to say..." DOSTI MAI NO SORRY , NO THANK YOU" ?....

Aman Kumar 6 years, 4 months ago

If its really helps uh, then wlc?

Priya Dharshini ? 6 years, 4 months ago

THanks for answers..??

Priya Dharshini ? 6 years, 4 months ago

LIke the libermann reaction is not there at all in text book. Even though it is given in xamidea or arihant.. but still chemistry teachers say do each and everyline of ncert u can get full marks.. this is truly false yaar.. if suppose i dont want to give competitive exams.. and i am giving board they cant ask such questions... these are not concept based also..

Aman Kumar 6 years, 4 months ago

Eske aalawa....mujhe nhi pata becz ....board ne question prepare karne time mujhse suggestions nhi liye.....?????...ager aisa hota toh...sabke 95% above aate???

∂Αяѕнαиαα ყα∂Αѵ ??? 6 years, 4 months ago

If it's not given in ncert then it's not from cbse examination point of view but still if we are preparing for neet and jee then every detailed rxn Is important so to cope up those rxn I will suggest that u should follow refresher. becoz in refresher every chapter is given in detailed manner so I guess refresher cover all the content of the syllabus for both competitive as well as cbse.

4Thank You

Aman Kumar 6 years, 4 months ago

Listen , priya....80% - 90% will come from ncert? but the remaining 10% percent is not necessary that it come from ncert.... Board used to give such questions which may not be in ncert , just to see how much you have the understand the concept.....just to see that...some questions come from somewhere else..........I think so?