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

The maximum (or reversible) work that can be done by a thermodynamic system at constant temperature and pressure is known as Gibbs energy. The reversible work in thermodynamics means a special method in which work is carried out such that the system is in perfect equilibrium with all its surroundings.

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Which metals shows negative oxidation state?

Posted by Sarika Singh 4 years ago

CBSE > Class 12 > Chemistry

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State le chatelier's principle

Posted by Tannu Jaiswal 4 years ago

CBSE > Class 12 > Chemistry

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Yogita Ingle 4 years ago

Le Chatelier’s principles, also known as the equilibrium law, are used to predict the effect of some changes on a system in chemical equilibrium (such as the change in temperature or pressure). The principle is named after the French chemist Henry Louis Le Chatelier.

Le Chatelier said that equilibrium adjusts the forward and backward reactions in such a way to accept the changes affecting the equilibrium conditions.

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An organic compound ‘X’ having molecular formula C5H10O yields phenylhydrazone and gives negative response to the iodoform test and Tollen’s test.It produces n-pentane on reduction. Identify X and write the reaction involved

Posted by Yashvardhan Tiwari 4 years ago

CBSE > Class 12 > Chemistry

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Lovely Sharma 3 years, 11 months ago

3- Pentanone

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How to get good pasing marks in chemistry

Posted by Ashwani Pratap Singh Lodhi 4 years ago

CBSE > Class 12 > Chemistry

2 answers

Palak Agrahari 4 years ago

Just by writing and writing and yes ncert is most important

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Kl? ?? 4 years ago

Do complete NCERT theory and back exercise and intxt questions u get good marks near about 80-90

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Why cu does not show more than 2 oxidation state

Posted by Anuj Chahar 4 years ago

CBSE > Class 12 > Chemistry

2 answers

Jassi Midha 3 years, 11 months ago

Because in s block of Cu present one electron and in p block 11 electrons are present. If it loses two electron it become stable. Because of stability it doesn't release it doesn't show oxidation State more than 2

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Yogita Ingle 4 years ago

In an aqueous medium, Cu²⁺ is more stable than Cu⁺. This is because although energy is required to remove one electron from Cu⁺ to Cu²⁺, high hydration energy of Cu2+ compensates for it. Therefore, Cu⁺ ion in an aqueous solution is unstable.

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Faraday's laws of electrolysis can we come in board in 2020 to 2021 board paper ?

Posted by Jai Karnani 4 years ago

CBSE > Class 12 > Chemistry

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Lovely Sharma 3 years, 11 months ago

Elementary ideas are reduced but numericals may come

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Devil ? 3 years, 11 months ago

Nopes

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Anuj Chahar 4 years ago

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What is SHE ?

Posted by Vidya Vipul 4 years ago

CBSE > Class 12 > Chemistry

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Gourav Sharma 4 years ago

She is not she bro , she is he , actually she is not he or she but we consider she as he

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Yogita Ingle 4 years ago

A Standard Hydrogen Electrode (SHE) is an electrode that scientists use for reference on all half-cell potential reactions. The value of the standard electrode potential is zero, which forms the basis one needs to calculate cell potentials using different electrodes or different concentrations. SHE is composed of a 1.0 M H+(aq) solution containing a square piece of platinized platinum (connected to a platinum wire where electrons can be exchanged) inside a tube.

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Preparation of alcohol

Posted by Kritika Mehta 4 years ago

CBSE > Class 12 > Chemistry

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Yogita Ingle 4 years ago

General Methods of Preparation of Alcohols 1. Hydrolysis of Halides

Alkyl halides when boiled with an aqueous solution of an alkali hydroxide give alcohol through nucleophilic substitution mechanism.

R-X + KOH → R-OH + KX

This general procedure produces primary and secondary alcohols. Glycerol can be synthesized from propylene by a series of reactions including the hydrolysis of a halide as one step in the process.

2. Hydration of Alkanes

Direct hydration takes place by adding water in the presence of a catalyst.

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Gabriel pthalimide synthesis?

Posted by ☺️Vanshika Baliyan?? 4 years ago

CBSE > Class 12 > Chemistry

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Yogita Ingle 4 years ago

Gabriel phthalimide synthesis is used for preparing only primary amines. Phthalimide is first treated with KOH and then with an alkyl halide to form N-alkyl phthalimide. N-alkyl phthalimide on hydrolysis gives primary amine.

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Molecular mass of C6h12o6

Posted by Muskan Yadav 4 years ago

CBSE > Class 12 > Chemistry

3 answers

Palak Agrahari 4 years ago

12*6+1*12+16*6=72+12+96=180gm/mol

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Aayan Patel 4 years ago

180.18g/mol

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Sneha Bhardwaj 4 years ago

120g/mol

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Fluorine doesn't exhibit any positive Oxidation State. why?

Posted by Sunandini Singh 4 years ago

CBSE > Class 12 > Chemistry

3 answers

Aayan Patel 4 years ago

Fluorine is the most electronegative element in the periodic table. For showing positive oxidation state, it should be bonded to the more electronegative element than fluorine. ... Hence, fluorine always shows a negative oxidation state and can not show positive oxidation state.

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Sneha Bhardwaj 4 years ago

Because it is most electronegative element

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Yogita Ingle 4 years ago

Fluorine does not exhibit any positive oxidation state as it is the most electro-negative element and does not have d orbitals in its valance shell.

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Rxn of ethoxy 2- methylbutane with excess of HI ... ANSWER IT FAST

Posted by Devil ? 4 years ago

CBSE > Class 12 > Chemistry

5 answers

Gourav Sharma 4 years ago

5 answer ho gaye werna m hi bta de ta

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Gourav Sharma 4 years ago

Pta chla jaye ga

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Gourav Sharma 4 years ago

Thoda sa socho

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Gourav Sharma 4 years ago

Answer easy h

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Gourav Sharma 4 years ago

Dekho

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Is from organic the questions are asked from ncert back exercise and intext questions ?? Or some other type questions are asked ?

Posted by Devil ? 4 years ago

CBSE > Class 12 > Chemistry

3 answers

Devil ? 4 years ago

Añy dõubt ?

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Gourav Sharma 4 years ago

Seriously

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Sneha Bhardwaj 4 years ago

For solving organic firstly NCERT should be on tips

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Chapter 10 intext question 10.5 (vi) How this reaction take place ?? Tell mechanism /rule used ?

Posted by Komal Bansal 4 years ago

CBSE > Class 12 > Chemistry

3 answers

Jassi Midha 3 years, 11 months ago

Br attached to the aromatic ring . The reaction is take place as free radical halogenation (pg-289). You have to just focus on major product.

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Sneha Bhardwaj 4 years ago

Hope you get it

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Sneha Bhardwaj 4 years ago

In KCN,K is positively charged while CN is negatively charged therefore they form ionic bonds in this case both Cand N can donate electrons but the C-C is more stable to attain stability C donates its electron and form cyanide ion but in case of AgCN ,AgCN form covalent bond Here C is in bonding with Ag so it is not free to donates its electron.but N is free so it can donate its electron pair forming isocyanide.

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Chapter 10 intext question 10.5 (ii) How this reaction take place? Please tell ???

Posted by Komal Bansal 4 years ago

CBSE > Class 12 > Chemistry

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Hell volhard zelinsky reaction?

Posted by ☺️Vanshika Baliyan?? 4 years ago

CBSE > Class 12 > Chemistry

2 answers

Noddy Dev 4 years ago

Yes right answer at the top

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Jass . 4 years ago

When carboxylic acid (having alpha-hydrogen) reacts with Red P , X2 (X=F,Cl,Br,I) and water, then there is formation of alpha halogenated carboxylic acid. For eg. Ch3Cooh + Red P + Cl2 + H2O = ch2(cl)cooh

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Biomolecule

Posted by Reena Jangra Jangra 4 years ago

CBSE > Class 12 > Chemistry

2 answers

Devil ? 3 years, 11 months ago

Very easy for bio students

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Gourav Sharma 4 years ago

Ha ye chapter h chemistry me both chota sa chapter h aur khafi portion b reduce hua

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Using crystal field theory write electonic configuration (interms of t2g and eg)& calculate the magnetic moment. (i) [CoF6]3- (ii) [Fe(CN) 6]4-

Posted by Varada Menon 4 years ago

CBSE > Class 12 > Chemistry

1 answers

Aayan Patel 4 years ago

Magnetic moment μ=n(n+2) where, n= Number of unpaired electrons i) Number of unpaired electrons in [CoF6]3−=4 Magnetic moment =n(n+2)=4(4+2)=24=4.9 BM

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Name the zeolite present in the petroleum industry

Posted by Thachi Thachi 4 years ago

CBSE > Class 12 > Chemistry

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One method of preparation of colloid

Posted by Thachi Thachi 4 years ago

CBSE > Class 12 > Chemistry

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Yogita Ingle 4 years ago

Chemical Methods of Preparation of Colloids

Hydrophilic or Lyophobic colloidal solutions can be prepared by various chemical techniques such as:

Double Decomposition Technique: When hydrogen sulphide is passed through a solution of arsenious oxide in distilled water, we get a colloidal solution of arsenious chloride.

As₂O₃ + 3H₂S → As₂S₃ + 3H₂O

Oxidation Technique: A colloidal solution of Sulphur is made to pass through an aqueous solution of sulphur dioxide. It can also be obtained by passing the gas through a solution of an oxidization agent such as bromine water as well as nitric acid.

SO₂ + 2H₂S → 2H₂O + 3S

H₂S + [O] → H₂O + S

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Yrr conversion kaise sikhe mujhe bilkul nahi aa raha please help in me in that

Posted by Diksha Singh 4 years ago

CBSE > Class 12 > Chemistry