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

If you have specific charts for named reactn and chapterwise reactn and distinguishing test ..... Then you can do it in 2-3 hours.... I have it but it unable to send it it will to you bcz of non-avaibility of options... U can do it bcz i had done whole chemistry in one day only. ......in this year's pre boards.

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Sneha Panwar 3 years, 11 months ago

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Prince Kumar 3 years, 11 months ago

You can revise Organic Chemistry in 1 Day if you have 72 Hours in Single Day.

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Tendency to show -2 oxidation State decreases from oxygen to terrarium why

Posted by Yash Maheshwari 3 years, 11 months ago

CBSE > Class 12 > Chemistry

2 answers

Ankit Baghel 3 years, 11 months ago

Yess ...! Metallic character increase down the groupp.... So, tendency to lose electron increases .. Means +ve oxidation state is more stable down the group.

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Atifa And Alveera Parveen 3 years, 11 months ago

Due to down the group matellic character increse.

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Calculate the volume of Co2 at 300K and 80KPa which could be obtained by heating 5g of calcium trioxocarbonate at s.t.p

Posted by Elizabeth Afful 3 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

How to determine basic strength in organic chemistry

Posted by Legend Killer 3 years, 11 months ago

CBSE > Class 12 > Chemistry

2 answers

Abhi Rana 3 years, 11 months ago

To determine basic strengths remove (OH)- ion from compound and check how much stable your carbocation is formed the more it is stable more basic strengths if OH group is not available in compound than remove( H+) more the stable carboanion is form more is acidic and lesser is basic strength

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Jagdish Suthar 3 years, 11 months ago

When the effect like aromaticity resonance mesomeric hyperconjugation inductive are high then acidic strength increase then less acidic we call basic

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Basic nature of amines

Posted by Raja Yadav 3 years, 11 months ago

CBSE > Class 12 > Chemistry

3 answers

Raja Yadav 3 years, 11 months ago

Two page answer is not a short question answer and this is the long question answer

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Aditya Gupta 3 years, 11 months ago

Amines contains a lone pair of electrons on its nitrogen atom which is easily available for protonation. This is the cause of basic nature. Any other group which increases the electron density on nitrogen increases the basicity.

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Gaurav Seth 3 years, 11 months ago

ANSWER
Amines contains a lone pair of electrons on its nitrogen atom which is easily available for protonation. This is the cause of basic nature. Any other group which increases the electron density on nitrogen increases the basicity.

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ANSWER

Draw a structure of noble gas compound which is isostuctural

Posted by Rakesh Kumar 3 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 3 years, 11 months ago

XeO₃ is isostructural with BrO₃- . (pyramidal structure)

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An ideal solution is made by mixing two volatile components A and B. If the vapour pressure of solution is 150 mm Hg then the mole fraction of A in vapour phase is

Posted by Deepak Sengar 3 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

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An element x atomic mass 40 gram per mole have apps structure has unit cell its length of 400 picometre calculate the density of X and the number of unit cells in 4 gram of x

Posted by Ayush Jain 3 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Difference between propanoyl chloride and propanoic acid

Posted by Ritesh Paswan 3 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 3 years, 11 months ago

Propanoyl chloride and propanoic acid can be differentiated by the chemical reactions given as below:

Propanoyl chloride reacts with few drops of water, to give hydrochloric acid and original carboxylic acid. On dipping blue litmus paper into it, it turns into red color.

On adding NaHCO3 , solution to each of them, propanoyl chloride will not react whereas propanoic acid will give brisk èfferevescence due to the evolution of CO2 .Read more on Sarthaks.com - https://www.sarthaks.com/919462/chemical-tests-distinguish-between-following-compounds-propanoyl-chloride-propanoic

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give reason for an predict all the possible alkene that would be formed by the dehydrogenation of 2 chloro 2 methylpentane with alcoholic koh

Posted by Tanmay Singh 3 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Rosenmund rxn

Posted by Nikita Mittal 3 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Jeetu Thomas 3 years, 11 months ago

The reaction in which acidchlorid when treated with palladium in presence of Baso4 get hydrogenarated from aldyhide (This reaction is controlled)

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ANSWER

When a coordination compound NiCl2. 6H2O is mixed with AgNO3, 2 moles of AgCl are precipitated per mole of the compound. Write (i) Structural formula of the compound (ii) IUPAC name of the compound

Posted by Mr. King 3 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Gaurav Seth 3 years, 11 months ago

When the co-ordination compound is reacted with AgNO3 it liberates 2 moles of AgCl, which indicates 2 Cl- ions are outside the co-ordination sphere satisfying primary valence(+2).
- Remaining 6 H2O ligands will be inside the co-ordination sphere satisfying secondary valence (+6)
- Therefore, structural formula of the compound must be [Ni(H2O)6]Cl2.

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ANSWER

An element crystallized in f.c.c lattice with edge length of 400 pm the density of the wlement is 7gm how many atoms are present in 280g of the element

Posted by Olina Shanglai 3 years, 11 months ago

CBSE > Class 12 > Chemistry

2 answers

Gaurav Seth 3 years, 11 months ago

Q u e s t i o n : An element crystallizes in a fcc lattice with cell edge of 400 pm. The density of the element is 7 g cm^-3. How many atoms are Present in 280 g of the element ?

A n s w e r :

Volume of the unit cell a³ = (400 pm)³

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Yogita Ingle 3 years, 11 months ago

Step I. Calculation of mass of an atom of the elements
Let the mass of an atom of the element = m gram
Mass of the unit cell = 4×m=(4m)
Edge length (a)= 400 pm = 400pm ×10⁻¹⁰
Volume of the unit cell =(400×10⁻¹⁰cm)³=64×10⁻²⁴cm³
Density of unit cell = 7 g cm⁻³
Density of unit cell =Mass of unit cellvolume of unit cell=Mass of unit cellvolume of unit cell
(7 g cm⁻³)=(4m)g/ (64×10⁻²⁴cm³)
m=(7gcm−3)×(64×10−24cm3)/ 4=112×10⁻²⁴g
Step II. Calculation of the number of atoms in 280 g of the element.
No. of atoms=Mass of the elementMass of one atom of the elementNo. of atoms=Mass of the elementMass of one atom of the element
=(280g)/(112×10⁻²⁴g)=2.5×10²⁴atoms

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ANSWER

Why is nh3is more basic then ph3

Posted by Niharika Singh 3 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Gaurav Seth 3 years, 11 months ago

Due to smaller atomic size the density of lone pair electrons on N in NH3 is larger than that of P in PH3. So, NH3 is a stronger Lewis base than that of PH3.

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ANSWER

p and as can form dpi-dpi bond also with transition metals when their compounds like p(c2h5)3 and as(c6h5)3 act as ligands. why?

Posted by Shery Shukla 3 years, 11 months ago

CBSE > Class 12 > Chemistry

2 answers

Jassi Midha 3 years, 11 months ago

P and As act as ligads because they can form dπ-dπ bond ' d block elements are known as transition metals' with variable oxidation state so with having various oxidation state the act as ligand.

2Thank You

Vishal Tiwari 3 years, 11 months ago

Nahi malum

2Thank You

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Predict the stereochemistry of the product formed if an optically active alkyl halide undergo substitution reaction by SN1 reaction

Posted by Anchal Sharma 3 years, 11 months ago

CBSE > Class 12 > Chemistry

2 answers

Jassi Midha 3 years, 11 months ago

For diagram see page no. 293 of ncert chemistry part II. the incoming nucleophile interact with alkyl halide causing the C-Cl bond to break while forming a new C-OH bond. Process take simultaneously in a single step. The configuration of carbon atom attack of nucleophile is much the same way an umbrella is turned inside out when caught in a strong wind while the leaving group is pushed away - called inversion of configuration.

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Drishty Kamboj 3 years, 11 months ago

Can i ask if the ques is from syllabus?

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ANSWER

What in Cl2 or Cl- is elctrophile or nucleophile

Posted by Drishty Kamboj 3 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Khushi Gupta 3 years, 11 months ago

Cl- is an neuclophile while cl2 is just stable with its octet...it shows no such character as electrophile or neuclophile

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ANSWER

(C⁶H⁵)²NCH³, Write IUPAC name of this compound?

Posted by Mohammad Azam 3 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Volumetric Analysis(Permanganometry)and sol preparation -Demonstration

Posted by Sini Sebastian 3 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Why agbr shows both frenkel & Schottky defect

Posted by Vishal Khandelwal 3 years, 11 months ago

CBSE > Class 12 > Chemistry

2 answers

Student Of The Year 3 years, 11 months ago

Due to precipitation of both ion. Since Ag+ ion is small in size they leave own lattice site and occupied interstitial site, so it show both defect. Or, the size of cation and anion are intermediate.

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Yogita Ingle 3 years, 11 months ago

The radius ratio for AgBr is intermediate. Thus, it shows both frenkel and schottky defects.

The major defect in AgBr is the Frenkel defect. It has a rock salt structure i.e. CCP lattice of Br with atoms of Ag occupying all octahedral holes. Ag moves from octahedral to tetrahedral sites causing only cations to precipitate.

Schottky defect arise due to missing of ions from their lattice point and frenkel arise when the missing ions occupy interstitial sites.

in AgBr, Ag⁺ ion is small in size and when removed from lattice point they can occupy interstitial site and therefore show both frenkel and schottky defect. SCHOTTKY Defect in AgBr is exhibited due to precipitation of both Cations and Anions.

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ANSWER

What do you understand by specific reaction rate? Derive it's unit for reaction of order n

Posted by Hritik Aryan 3 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

What do you understand by electrode potential and how does of concentration into existence

Posted by Hritik Aryan 3 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Radhika Kaushal 3 years, 11 months ago

The electrical potential difference developed between metal and its ions is electrode potential.

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ANSWER

Derive si unit of molar conductivity

Posted by Hritik Aryan 3 years, 11 months ago

CBSE > Class 12 > Chemistry

3 answers

Harsh Mishra 3 years, 11 months ago

This is what I always say to these teachers, but u know they're just copy machines. They don't care they just report..

2Thank You

Hritik Aryan 3 years, 11 months ago

Yogita Yaar google s copy nhi krna tha

3Thank You

Yogita Ingle 3 years, 11 months ago

The following expression is used to mathematically represent molar conductivity.

Λ_m = K / C

Where K is the specific conductivity and c is the concentration in mole per litre.

In general, the molar conductivity of an electrolytic solution is the conductance of the volume of the solution containing a unit mole of electrolyte that is placed between two electrodes of unit area cross-section or at a distance of one-centimeter apart.

The unit of molar conductivity is S⋅m²⋅mol^-1.

3Thank You

ANSWER

Surface chemistry mein kya Catalysis pura delete ho gya h..? And Ex se kn kn se ques delete hnge jara btana... Plz

Posted by Sonali Baral 3 years, 11 months ago

CBSE > Class 12 > Chemistry

3 answers

Jassi Midha 3 years, 11 months ago

Deleted question of chapter 5 are: 7, 13,16,17,18,19,20,21,22,24. Because emulsion and enzymes are also deleted from syllabus

2Thank You

Drishty Kamboj 3 years, 11 months ago

Yeah whole of catalyst topic has been deleted and questions which are based on this topic too...

3Thank You

Tanya ?? 3 years, 11 months ago

Hanji catalysis pura delete ho gya h pr mujhe exercise k questions ka nhi pta konse konse dlt honge...

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ANSWER

How much HCL in grams is required to prepare 250 mL of M/10 solution?

Posted by Aakriti Rustagi 3 years, 11 months ago

CBSE > Class 12 > Chemistry

2 answers

Drishty Kamboj 3 years, 11 months ago

Ac to ques M/10 means 0.1M sol now for 0.1moles per 1 l of sol,we have to calculate no. Of moles for 250 ml of sol ie 0.1/4 Let it be x(0.1/4 =x) This x is the no. Of moles of hcl in 250 ml of sol We have to calculate the mass of this x Mass of 1 mol of hcl =36.5 Mass of x=36.5*x

1Thank You

Yogita Ingle 3 years, 11 months ago

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ANSWER

A solution containing 1.234g of calcium nitrate in 10 g of water boils at 100.995'c at 760mm. Calculate the vant hard factor for the salt at this concentration

Posted by Hritik Aryan 3 years, 11 months ago

CBSE > Class 12 > Chemistry

2 answers

Drishty Kamboj 3 years, 11 months ago

Vant hoff factor has been deleted this year....i guess

3Thank You

Sonali Baral 3 years, 11 months ago

"i" is the van't hoff factor, then ΔTb=iKb×m (100.975−100)=i×0.52×164×101.23×1000 i=123×0.520.975×164=2.5 Now if x is the degree is dissociation, then Ca(NO3)2⇋ Ca2++ 2NO3− 1 0 0: Initially 1−x x 2x: At eqbm. ∴i=11−x+x+2x=11+2x=2.5⇒x=0.75 ∴ Percentage dissociation =75%

3Thank You

ANSWER

Calculate equivalent mass of Na2CO3

Posted by Aakriti Rustagi 3 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 3 years, 11 months ago

The reaction involved is,
Na₂CO₃ + HCl → NaCl + NaHCO₃
Equivalent mass of Na₂CO₃= 106/1 = 106.

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ANSWER

In ch 10 of organic its written that bond length of C-X increases as we move downward in. Group then according to this the boiling point should decrease as the size of X increase... But at other point its written that boiling point has the order RI>RBr>RCl>RF... CAN anyone justify this

Posted by Drishty Kamboj 3 years, 11 months ago

CBSE > Class 12 > Chemistry

2 answers

Drishty Kamboj 3 years, 11 months ago

Now can anyone answer why is Iodine a better leaving group if it has higher boiling point

0Thank You

K S 3 years, 11 months ago

As the size and mass of halogen atom increases,there is an increase in the magnitude of van der waal's forces due to which the boiling point increases down the group.

2Thank You

ANSWER

Under what conditions, Ecell =0 and ΔG = 0?

Posted by Vicky Wani 3 years, 11 months ago

CBSE > Class 12 > Chemistry

2 answers

Tanya ?? 3 years, 11 months ago

At equilibrium.

1Thank You

Yogita Ingle 3 years, 11 months ago

At equilibrium

E_Cell=0

Therefore according to the formula, Δ_rG = −nFE_Cell
Δ_rG=0

1Thank You

ANSWER

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Aniline (ph−NH2) can be prepared from benzene using conc.H2SO4/conc.HNO3 followed by Sn/HCl as shown in the above image.

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a n s w e r

Aniline (ph−NH2​) can be prepared from benzene using conc.H2​SO4​/conc.HNO3​ followed by Sn/HCl as shown in the above image.

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Aniline (ph−NH2) can be prepared from benzene using conc.H2SO4/conc.HNO3 followed by Sn/HCl as shown in the above image.