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

For chemistry i can give gurantee.. but not for physics or maths... when u try to solve last year papers u try to find out there will be many questions from various guides and logical thinking...they twist and ask the known questions also diffrently..

1Thank You

Jay Gautam 6 years, 5 months ago

Yes NCERT plus 10years practice papers are more than enough

1Thank You

ANSWER

Blister copper

Posted by Deependra Singh Patel 6 years, 5 months ago

CBSE > Class 12 > Chemistry

1 answers

Sia ? 6 years, 5 months ago

The solidified copper obtained after extraction has blistered appearance due to evolution of SO₂and so it is called blister copper.

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ANSWER

Vant half factor

Posted by Sujandangi Dangi 6 years, 5 months ago

CBSE > Class 12 > Chemistry

2 answers

Ansh Preet 6 years, 5 months ago

It is the ratio of normal molar mass of the solute to the observed molar mass of the solute... It is denoted by i

1Thank You

Shivam Chaurasia 6 years, 5 months ago

Obseved value divided experimental value ratios.

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ANSWER

write iupac name of the following compound

Posted by Kamlakar Holkar 6 years, 5 months ago

CBSE > Class 12 > Chemistry

2 answers

? Natasha Yadav? 6 years, 5 months ago

Strange! Without giving compound asking for iupac name

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Ansh Preet 6 years, 5 months ago

Which compound

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ANSWER

What happens when phenol is oxide byNa2Cr2O7/H2SO4

Posted by Sunil Gayke 6 years, 5 months ago

CBSE > Class 12 > Chemistry

1 answers

Riya Singh 6 years, 5 months ago

It will form para benzo quinone

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ANSWER

What is coupling reagent

Posted by Ajendra Singh 6 years, 5 months ago

CBSE > Class 12 > Chemistry

1 answers

Ďãřşháñăã Yadav ? ? ? 6 years, 5 months ago

Arenediazonum salts react with highly reactive aromatic compounds such as aniline, phenols to form brightly colored azo compound, Ar--N=N---Ar. This medium at 273-278 k in which the molecule at its para position is coupled with diazonium salt to form p-aminoazobenzene.

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ANSWER

The electrical resistance of a column of 0.05M NaOH solution of 1dcm and length 50cm is 5.55 multiplied by 10 to the power 3. Calculate it's resistivity, conductivity and Molar conductivity

Posted by Anita Gusain 6 years, 5 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Why F2 always exhibit an oxidation state of -1

Posted by Rakshit Singh 6 years, 5 months ago

CBSE > Class 12 > Chemistry

3 answers

Sandeep Tyagi Sandeep Tyagi 6 years, 5 months ago

Because it is more electronegative

0Thank You

Gursharn Kaur 6 years, 5 months ago

According to me this is wrong F2 will have an Oxidation state of 0 as it is in its elementary state

0Thank You

Lalit Godara 6 years, 5 months ago

Becouse it is most electro negative atom that's why f2 always show -1 oxidation State

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ANSWER

WhT is activation energy

Posted by Aashir Arham ⚽?⚽ 6 years, 5 months ago

CBSE > Class 12 > Chemistry

9 answers

Aashir Arham ⚽?⚽ 6 years, 5 months ago

I live in Pune right now...........but my hometown is Kanpur

0Thank You

Aastha Saxena 6 years, 5 months ago

In mathematical form, the activation energy = threshold energy - normal energy of reacting species

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꧁≪Mämƭå ℭℏ۝ᑌĎℎàℜÿ? 6 years, 5 months ago

Anjaan ...usne pehle mujhe puccha tha...

2Thank You

꧁≪Mämƭå ℭℏ۝ᑌĎℎàℜÿ? 6 years, 5 months ago

Nothing pehle aapne puccha tha mujhe....

2Thank You

Anjaan Ladka 6 years, 5 months ago

What do u have to do with that? M. Choudhary

1Thank You

Shri Varshan 6 years, 5 months ago

The minimum energy required for the reactant molecules to cross the energy barriers so they re coverted to products

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Ďãřşháñăã Yadav ? ? ? 6 years, 5 months ago

it is the extra energy contained by the reactant molecules that results into effective collisions b/w them to form the product. it is denoted by Ea.

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Anjaan Ladka 6 years, 5 months ago

The energy required to convert reactants into products is known as activation energy.

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꧁≪Mämƭå ℭℏ۝ᑌĎℎàℜÿ? 6 years, 5 months ago

From where do you belong??

1Thank You

ANSWER

The activation energy of a reaction is 94.14 KJ/mole and rate constamtvat 298k is 18×10^-5 sec calculate frequency factor

Posted by Laxmi Narayan Barupal 6 years, 5 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

why it is difficult to prepare pure amines by ammonolysis of alkyl halides.?

Posted by Řøhăň Řąjpůť ✌️✊ 6 years, 5 months ago

CBSE > Class 12 > Chemistry

25 answers

Řøhăň Řąjpůť ✌️✊ 6 years, 5 months ago

nhi mai nhi janta... but Jo bhe hai intelligent hai...

1Thank You

꧁≪Mämƭå ℭℏ۝ᑌĎℎàℜÿ? 6 years, 5 months ago

Jante ho kya issy,?

2Thank You

꧁≪Mämƭå ℭℏ۝ᑌĎℎàℜÿ? 6 years, 5 months ago

Kon hai yeh naya chehra....??

2Thank You

? Natasha Yadav? 6 years, 5 months ago

Same to you.

1Thank You

Řøhăň Řąjpůť ✌️✊ 6 years, 5 months ago

ya... kitni smjhdar ho... vese mai first time kisi strange girl se aese baat ker ra hoon... sry if u feel annoying .... bye see u later. till than gn, gm, gud afternoon, gud evening.

0Thank You

? Natasha Yadav? 6 years, 5 months ago

I am never serious in life, but advice others to be serious. I will try to follow the rules, but i know you will not allow me to do that.

1Thank You

Řøhăň Řąjpůť ✌️✊ 6 years, 5 months ago

vese mai majak ker ra Tha tumse. don't take it serious.

0Thank You

Řøhăň Řąjpůť ✌️✊ 6 years, 5 months ago

arrey rule toh banate he hai TODNE ke liye. ? ? chill

0Thank You

? Natasha Yadav? 6 years, 5 months ago

Why i will do like that. I am thinking for your benefit. I hope you will not reply back and i think unusual talks and chats are against policies of this app

1Thank You

Řøhăň Řąjpůť ✌️✊ 6 years, 5 months ago

abb chalo tum bhaga rahi ho toh chala jata hoon. ? ?

0Thank You

Řøhăň Řąjpůť ✌️✊ 6 years, 5 months ago

let me tell u.. my exam are on 1.

0Thank You

? Natasha Yadav? 6 years, 5 months ago

I think you have exam tomorrow , so please don't waste your time, And then if you are wasting it , it means you want to relieve from tension.

1Thank You

Řøhăň Řąjpůť ✌️✊ 6 years, 5 months ago

joke ki remand laga di apne. ? koi ni

1Thank You

? Natasha Yadav? 6 years, 5 months ago

Why will i give charge. It is free of cost right. Nice joke.

1Thank You

? Natasha Yadav? 6 years, 5 months ago

Thanks again.

1Thank You

Řøhăň Řąjpůť ✌️✊ 6 years, 5 months ago

ohh.... fir abb se charge lagega mere questions read Kerne ka.. ? ? ? just kidding

0Thank You

? Natasha Yadav? 6 years, 5 months ago

I also had same doubt,

1Thank You

Řøhăň Řąjpůť ✌️✊ 6 years, 5 months ago

how my question help u? ?

0Thank You

Řøhăň Řąjpůť ✌️✊ 6 years, 5 months ago

sry Mai kuch smjha nhi

0Thank You

? Natasha Yadav? 6 years, 5 months ago

Because of your question my concept got cleared , thank you.

1Thank You

Řøhăň Řąjpůť ✌️✊ 6 years, 5 months ago

shukriya

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Ďãřşháñăã Yadav ? ? ? 6 years, 5 months ago

it is difficult to prepare pure amines by ammonolysis of alkyl halides becoz it is Nucleophillic substitution rxn nd ammonia behaves as a Nucleophile to form 1°amine. now this 1°amine behaves as a Nu^- and reacts with alkyl halide to give 2° amine which on further rxn yields 3° amine nd quaternary ammonium salt

1Thank You

Vishakha Dixit 6 years, 5 months ago

Welcome?

0Thank You

Řøhăň Řąjpůť ✌️✊ 6 years, 5 months ago

thnx

1Thank You

Vishakha Dixit 6 years, 5 months ago

Ammonolysis of alkyl halides leads to the formation of mixture of primary,secondary and tertiary amines along with the quaternary salts.

2Thank You

ANSWER

Calculate the molarity of pure water density of water 1g/ml

Posted by Sevti Mahave 6 years, 5 months ago

CBSE > Class 12 > Chemistry

2 answers

Sevti Mahave 6 years, 5 months ago

No it's wrong answer

0Thank You

Anjaan Ladka 6 years, 5 months ago

0.05 mol per liter

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ANSWER

Why kcn is used sometimes while their is a substitute like AgCn etc can be used for cyanide purpose?

Posted by Tawar Bana 6 years, 5 months ago

CBSE > Class 12 > Chemistry

1 answers

Vishakha Dixit 6 years, 5 months ago

As cyanide is the example of ambi dentate nucleophile i.e.,having two donating atoms but only one can donate at a time Therefore KCN is for donating atom C (Carbon) of CN where AgCN is for donating atom N(Nitrogen) of CN

1Thank You

ANSWER

Electrolysis of aqueous copper chloride using copper electrodes

Posted by Niti Singh 6 years, 5 months ago

CBSE > Class 12 > Chemistry

1 answers

Sevti Mahave 6 years, 5 months ago

Which subject you have taken neeti

0Thank You

ANSWER

Write the hybridization and shape of [Fe (CN)6]3_ (atomic numberof Fe= 26

Posted by Aastha Priya 6 years, 5 months ago

CBSE > Class 12 > Chemistry

1 answers

Sakshi Saruta 6 years, 5 months ago

Hii I think d2sp3

0Thank You

ANSWER

How can i prepare organic chemistry ???

Posted by Âññü Šîñg*H??? 6 years, 5 months ago

CBSE > Class 12 > Chemistry

2 answers

꧁≪Mämƭå ℭℏ۝ᑌĎℎàℜÿ? 6 years, 5 months ago

Nice answer ??? Sakshi

2Thank You

S.....Sharma☺??? .. 6 years, 5 months ago

Hey i am also not so perfect but my experience is ay that organic chemistry mange practice more aapko jab aapke teacher chapter karte h to aapko ghar jaate hi usea revise kare or usko regular phade agar aap kjch din gap loge to aap sab bhul jaaoge

2Thank You

ANSWER

Is it possible to have a reaction with uniform rate?

Posted by Anjaan Ladka 6 years, 5 months ago

CBSE > Class 12 > Chemistry

1 answers

Aashir Arham ⚽?⚽ 6 years, 5 months ago

Yeah

0Thank You

ANSWER

In physical chemistry ..i want to solve numerical on each topic.. From where can i get them....??

Posted by ꧁≪Mämƭå ℭℏ۝ᑌĎℎàℜÿ? 6 years, 5 months ago

CBSE > Class 12 > Chemistry

8 answers

Aashir Arham ⚽?⚽ 6 years, 5 months ago

If you will get the plz read it

1Thank You

꧁≪Mämƭå ℭℏ۝ᑌĎℎàℜÿ? 6 years, 5 months ago

Nope

0Thank You

Aashir Arham ⚽?⚽ 6 years, 5 months ago

Do you ever read that book

1Thank You

꧁≪Mämƭå ℭℏ۝ᑌĎℎàℜÿ? 6 years, 5 months ago

Is it really good

0Thank You

Aashir Arham ⚽?⚽ 6 years, 5 months ago

It is the name of book

1Thank You

Aashir Arham ⚽?⚽ 6 years, 5 months ago

Comprehensive chemistry

1Thank You

Amol Gùpta 6 years, 5 months ago

Behen ncert is best nothing can replace it so do practice with that

2Thank You

Ďãřşháñăã Yadav ? ? ? 6 years, 5 months ago

from ncert ncert have level yaar.. but if u want more numerical u can go through refresher like pradeep nd modern.

2Thank You

ANSWER

Plz tell me the answer of question 5.4 (intext question ) in chapter 5

Posted by Shivank Bhardwaj 6 years, 5 months ago

CBSE > Class 12 > Chemistry

1 answers

Anjaan Ladka 6 years, 5 months ago

CO works as catalytic poison. It hinders the catalytic activity. So it is necessary to remove it.

1Thank You

ANSWER

Why prepration of phenol INDUSTRIALY prefered by cumene although dows process is also a good method to prepare phenol?

Posted by Vishakha Dixit 6 years, 5 months ago

CBSE > Class 12 > Chemistry

2 answers

Vishakha Dixit 6 years, 5 months ago

Thanks S....

0Thank You

S.....Sharma☺??? .. 6 years, 5 months ago

Because cumene give the product in large no. and good yield si it is best for make in large extent

1Thank You

ANSWER

Draw the bond line structure of 1-chloro-3-methyl-butane

Posted by Shivam Rao 6 years, 5 months ago

CBSE > Class 12 > Chemistry

4 answers

S.... ????☺ 6 years, 5 months ago

Ch2(cl)-ch2-ch(ch3)-ch3

0Thank You

Anjaan Ladka 6 years, 5 months ago

This may help

0Thank You

Anjaan Ladka 6 years, 5 months ago

ClC--C--C'CH3--C

0Thank You

Anjaan Ladka 6 years, 5 months ago

Bro I cant draw here

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ANSWER

Draw the bond line structure of 2-bromo-butane

Posted by Shivam Rao 6 years, 5 months ago

CBSE > Class 12 > Chemistry

3 answers

S.... ????☺ 6 years, 5 months ago

Ch3-ch(Br)-ch2-ch3

0Thank You

Aman Singh 6 years, 5 months ago

C-brc-c-c

0Thank You

Aman Singh 6 years, 5 months ago

C/br c\c/c

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ANSWER

How do you explain the absence of aldehyde group in the pentaacetate of D-glucose? Plzzz answer if anyone knows the answer of this question....

Posted by Tanvi Toor 6 years, 5 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Why glass are called supercooled liquids

Posted by Umesh Yadav 6 years, 5 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 6 years, 5 months ago

Glass is a amorphous solid so all amorphous solid have a tendency to flow, though very slowly. Hence, glass is considered as a super cooled liquid. That is why the glass windows and doors become slightly thicker at the bottom than at the top with the time.

1Thank You

ANSWER

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