RNA is a ribonucleic acid that helps in the synthesis of proteins in our body. This nucleic acid is responsible for the production of new cells in the human body. It is usually obtained from the DNA molecule. RNA resembles the same as that of DNA, the only difference being that it has a single strand unlike the DNA which has two strands and it consists of an only single ribose sugar molecule in it. Hence is the name Ribonucleic acid. RNA is also referred to as an enzyme as it helps in the process of chemical reactions in the body.

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What does 'qualitative ideas' means? This is mentioned in our revised syllabus

Posted by Shreyansh Yadav 5 years, 5 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

What is invert sugar

Posted by Anushka Shrivastava 5 years, 5 months ago

CBSE > Class 12 > Chemistry

2 answers

Divyansh Chauhan 5 years, 5 months ago

Sucrose {{C12H22O11}} is called as invert sugar which is a disaccharide . On hydrolysis it forms 1:1 mixture of Glucose( α- glucose) and Fructose( β - fructose)...

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Maneesh Kumar 5 years, 5 months ago

Invert sugar is a mixture of equal parts of glucose and fructose resulting from hydrolysis of sugar.

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What is hybridization, structure and magnetic property of (1)= (COCl3(nh3)3) (2)=(fe(h2o)6)^3+ (3)=(co(en)3)^3+ (4)=(cr(nh3)4cl2)cl

Posted by Preeti Yadav 5 years, 5 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Which book is better - S.chand or Dinesh in chemistry

Posted by Sumit Kumar 5 years, 5 months ago

CBSE > Class 12 > Chemistry

2 answers

Devil ? 5 years, 5 months ago

Yeah

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Anushka Shrivastava 5 years, 5 months ago

I think Abc is good

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ANSWER

What is frenkel 'defect?

Posted by Sumit Kumar 5 years, 5 months ago

CBSE > Class 12 > Chemistry

2 answers

Yogita Ingle 5 years, 5 months ago

Frenkel defect:- If an ion is missing, from its lattice site and is occupies the interstitial site, electrical neutrality as well as Stoichiometry of the compound are maintained this type of defect is called frenkel defect.

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Ankit Kumar 5 years, 5 months ago

Cation or anion occupies interstitial side in lattice No change in density Ionic character decrease Covalent character increase Low coordination no. Ex.- AgBr , AgI , AgCl

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Structure of tetra methylene

Posted by Ashish Gupta 5 years, 5 months ago

CBSE > Class 12 > Chemistry

1 answers

Gaurav Seth 5 years, 5 months ago

tetramethylethylene

Molecular FormulaC₆H₁₂
Average mass84.160 Da
Monoisotopic mass84.093903 Da

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ANSWER

Sorry, yogita mam.

Posted by Ashutosh Bind 5 years, 5 months ago

CBSE > Class 12 > Chemistry

1 answers

Yash Agarwal 5 years, 4 months ago

It's ok baccha

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ANSWER

State Henry's law nd mention some important application.

Posted by Nisha Yadav 5 years, 5 months ago

CBSE > Class 12 > Chemistry

1 answers

Gaurav Seth 5 years, 5 months ago

Henry’s law states that the solubility of a gas in a liquid is directly proportional to pressure of the gas; temperature constant.

Mathematically, P = K_H x

where
x=mole fraction of gas in solution
P is partial pressure of gas,
K_H is Henry's constant.

Applications:

(1) Henry's law finds various applications in industry and enables us to explain and understand some biological phenomena. The some of important applications are : CO₂ solubility in soft drinks, beverages, soda water etc. is increased by applying high pressure and bottles are sealed under high pressure.

(2) For deep divers, oxygen diluted with less soluble He gas is used as breathing gas and it minimises the painful effects due to higher solubility of N₂ gas in blood.

(3) In lungs, where oxygen is present in air with high partial pressure, haemoglobin combines with O₂ to form oxyhaemoglobin. In tissues where partial pressure of O₂ is low, oxyhaemoglobin releases the oxygen for utilisation in cellular activities.

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What is more stable MoO_(3) or MoO_(2) and why?

Posted by Aryan Giri 5 years, 5 months ago

CBSE > Class 12 > Chemistry

1 answers

Lucky Singh 5 years, 5 months ago

The geometric and electronic structures of MoO3 and MoO2 have been calculated using the generalized gradient approximation to density functional theory. The calculated cross-section weighted densities of states are compared with high-resolution X-ray photoemission spectra. There is very good agreement between the calculated structures and those determined previously by X-ray diffraction and between the computed densities of states and the present photoemission measurements. MoO2 is shown to be a metallic material, as is found experimentally, but the Fermi level sits in a distinct trough in the density of states. Satellite peaks found in core photoemission spectra of MoO2 are shown to derive from final state screening effects in this narrow band metallic material

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Cu electronic configuration is 1s2 2s2 2p6 3s2 3p6 4s1 3d10 When we convert it cu2+ then why electron go from 4s1 and 3d9.....why electron go from 4s1 Electron will always go from 3d10 to 3d8.direct from D orbital but why from 4s1

Posted by Abhishek Maurya 5 years, 5 months ago

CBSE > Class 12 > Chemistry

2 answers

Lucky Singh 5 years, 5 months ago

Electronic configuration of Cu is 1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d9 ([Ar] 4s2, 3d9), whereas for Cu2+ is [Ar], 3d9. I found some periodic tables and electronic configuration notes, there is [Ar] 4s1, 3d10 for Cu. Isn't electron should be fill first 4s (2 e) and then 3d9? and for the ionize state of Cu (Cu2+) electron shouldn't be escape from the 4s state? Also I'm looking for the reason of electronic configuration [Ar] 4s1, 3d10.

2Thank You

Maneesh Kumar 5 years, 5 months ago

It is so because as we know that 4s electrons are filled first as they have lower energy than 3d. Electronic configuration of Cu should be [Ar]4s2,3d9 but it is observed that actual electronic configuration of Cu is [Ar]4s1,3d10. As 4s orbital has only one electron so it is no longer low energy orbital. It has energy higher than 3d and it lose electron first because electron will be removed first from the orbital which is farther from nucleus.

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ANSWER

At 40 degree celcius,the vapour pressure in torr of methyl alcohol ethyl alcohol solution is represented by P=119Xm +135 Where Xm is the mole fraction of methyl alcohol Find p°m and p°e .

Posted by Faizan Hussain 5 years, 5 months ago

CBSE > Class 12 > Chemistry

1 answers

Gaurav Seth 5 years, 5 months ago

The methanol and ethanol torr is P = 119x + 135

Where x is the mole fraction of methyl alcohol, then the value of limit x tends to 1/x

P0−P/P0= X will be the mole fraction of solute.

If X=1, then vapor pressure of methanol P=P0

P=119(1)+135

⇒135+119=255torr

If X=0, then vapor pressure of methanol P=P0

P=119(0)+135

⇒P=135

Therefore the vapor pressure of pure ethanol is 135 torr.

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ANSWER

Why rate of reaction does not remain constant throughout?

Posted by Gitu Kaji 5 years, 5 months ago

CBSE > Class 12 > Chemistry

1 answers

Gaurav Seth 5 years, 5 months ago

The rate of a reaction does not remain uniform throughout the reaction because it depends on concentration which changes with passage of time.

Rate of a reaction is a measure of rate of change of amount of reactant or product with time. Thus with time amount of reactant decreases and amount of product increases always. Thus rate of reaction can never be constant.

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Classify solid in different categories based on the nature of intermolecular forces

Posted by Rishabh Singh 5 years, 5 months ago

CBSE > Class 12 > Chemistry

1 answers

Gaurav Seth 5 years, 5 months ago

Question : Classify the following solids in different categories based on the nature of intermolecular forces operating in them: Potassium sulphate, tin, benzene, urea, ammonia, water, zinc sulphide, graphite, rubidium, argon, silicon carbide.

Answer :

=> Ionic solid
=> Molecular solid (non-polar)
=> Polar molecular solid
=> Polar molecular solid
=> Hydrogen bonded molecular solid
=> Ionic solid
=> Covalent/ Network solid
=> Metallic solid
=> Molecular solid (non-polar)
=> Covalent/ Network solid

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Why bond angle of NO2 + 2 - and not equal

Posted by Shubhojit Karmakar 5 years, 5 months ago

CBSE > Class 12 > Chemistry

1 answers

Shubhojit Karmakar 5 years, 5 months ago

Due to lone pair

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ANSWER

What are hybridisation States of each carbon atom in the following compound?

Posted by Somi Bharti 5 years, 5 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 5 years, 5 months ago

(i) C-1 is sp² hybridised.

C-2 is sp hybridised.

(ii) C-1 is sp³ hybridised.

C-2 is sp² hybridised.

C-3 is sp² hybridised.

(iii) C -1 and C-3 are sp³ hybridised.

C-2 is sp²hybridised.

(iv) C-1 is sp² hybridised.

C-2 is sp² hybridised.

C-3 is sp hybridised.

(v) C₆H₆ All the 6 carbon atoms in benzene are sp²hybridised.

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Why are aquatic animal more comfortable in cold water in comparison to summer

Posted by Pawan Dwivedi 5 years, 5 months ago

CBSE > Class 12 > Chemistry

2 answers

Maneesh Kumar 5 years, 5 months ago

Aquatic species are more comfortable in cold water as they get more oxygen in cold water than water on surface because solubility of gases increase with decrease in temperature.

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Yogita Ingle 5 years, 5 months ago

Aquatic species are more comfortable in cold water due to the presence of more oxygen. Solubility of oxygen in water increases with decrease in temperature as solubility of a gas in given liquid decreases with increase in temperature.

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ANSWER

15 blocks element.

Posted by Ayush Vishwakarma?? 5 years, 5 months ago

CBSE > Class 12 > Chemistry

5 answers

Suresh Sharma 5 years, 5 months ago

Group 15 elements :Nitrogen (N) Phosphorus (P) Arsenic (As) Antimony (Sb) Bismuth (bi)

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Maneesh Kumar 5 years, 5 months ago

Group 15 elements are:- Nitrogen(N), Phosphorus(P), Arsenic(As), Antimony(Sb), Bismuth(Bs), Moscovium (Mc). These 15th group elements are also known as "PNICOGENS".

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? Yang ? 5 years, 5 months ago

Group 15 includes: 1. Nitrogen (N) 2. Phosphorus (P) 3. Arsenic (As) 4. Antimony (Sb) 5. Bismuth (Bi) 6. Moscovium (Mc)

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Yogita Ingle 5 years, 5 months ago

GROUP 15 ELEMENTS

Nitrogen family: The elements of group 15 – nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb) and bismuth (Bi) belong to configuration is $n{s^2}n{p^3}$ .

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Devil ? 5 years, 5 months ago

Na P As Sb Bi

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What are grignards reagent? How are they prepared

Posted by Gulabhi Shetty 5 years, 5 months ago

CBSE > Class 12 > Chemistry

1 answers

Bharti Yadav 5 years, 5 months ago

any of various compounds of magnesium with an organic radical and a halogen (as ethyl-magnesium iodide C2H5MgI) that react readily (as with water, alcohols, amines, acids) in the Grignard reaction. Grignard reagents are made by adding the halogenoalkane to small bits of magnesium in a flask containing ethoxyethane (commonly called diethyl ether or just "ether"). The flask is fitted with a reflux condenser, and the mixture is warmed over a water bath for 20 - 30 minutes.

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ANSWER

How do you explain the absence of aldehyde group in the pentaacetate of D-glucose ???

Posted by Anushka Shrivastava 5 years, 5 months ago

CBSE > Class 12 > Chemistry

2 answers

Anushka Shrivastava 5 years, 5 months ago

Thanks yogita Ingle ma'am

1Thank You

Yogita Ingle 5 years, 5 months ago

Aldehydic group can be tested by using hydroxyl amine reagent which forms oxime. At C-l position, the cyclic hemiacetal form of glucose contains an — OH group which gets hydrolysed in the aqueous solution to form the open chain aldehydic form which then reacts to form the corresponding oxime.
Hence, glucose contains an aldehydic group. Pentaacetate of glucose does not contain a free —OH group at C-1 position.

Therefore, in aqueous solution it cannot get hydrolysed to form the open chain aldehydic form and thus it does not react to form glucose oxime. Hence, glucose pentaacetate does not contain the aldehyde group.

2Thank You

ANSWER

The vapour pressure of pure liquids A and B are 450 and 700 mm Hg at 350K . Find out the composition of the liquid mixture if total vapour pressure is 600 mm Hg . Also find the composition of the vapour phase.

Posted by Spurti . 5 years, 5 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

The osmotic pressure of 253 ml of a solution dissolving 34.2g of sugar at 27 deg C is..?

Posted by Zalak Desaii 5 years, 5 months ago

CBSE > Class 12 > Chemistry

1 answers

Spurti . 5 years, 5 months ago

π = CRT C= moles of solute/ volume of solution in letre C= 39.5 mol /l R=0.08 T= 27°C = 27+273 =300K π = 39.5× 0.08×300=948atm

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ANSWER

Shape , hybridisation and magnetic behaviour of coordination compounds on the basis of Valence bond theory

Posted by Student Student 5 years, 5 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

How to calculate mole fraction

Posted by Naman Meena 5 years, 5 months ago

CBSE > Class 12 > Chemistry

2 answers

Bhawna Sangwan 5 years, 5 months ago

If you want to get mole fraction of solute than you should use the formula that:-x2=n2/n1+ n2,here n1 is no. Of moles of solvent and n2 is no. Of moles of solute

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Ashish Gupta 5 years, 5 months ago

Mole fraction :- No of moles of given compound ÷ total no of moles of solute

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ANSWER

Which one is world's costly element?

Posted by Ashutosh Bind 5 years, 5 months ago

CBSE > Class 12 > Chemistry

1 answers

Mohd Junaid 5 years, 5 months ago

Francium

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ANSWER

Thanks Yogita i hope you will be the topper of this year.

Posted by Ashutosh Bind 5 years, 5 months ago

CBSE > Class 12 > Chemistry

1 answers

Gautam Prajapati 5 years, 5 months ago

Yogita ingle mam is not a student she is a teacher...

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ANSWER

Who was the father of chemistry?

Posted by Ashutosh Bind 5 years, 5 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 5 years, 5 months ago

Antoine Lavoisier is French chemist and born in Paris on 26 August 1743. His significant contributions to the field of science (1743-1794) are oxygen and hydrogen identification, combustion and stoichiometry.

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