CBSE > Class 11 > Chemistry | CBSE Board | Homework Help

It has no radial or angular nodes: the 1s orbital is simply a sphere of electron density. A node is a point where the electron probability is zero. As with all orbitals the number of radial nodes increases with the principle quantum number (i.e. the 2s orbital has one radial node, the 3s has two etc.).

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The ksp for AlOH2 is 2.1×10^-11. Calculate the solubility in gram per litre ph of solution

Posted by Anish Biswal 7 years ago

CBSE > Class 11 > Chemistry

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define leechartis principle

Posted by Sivan Karthick 7 years ago

CBSE > Class 11 > Chemistry

1 answers

Alia Khan ❤?❤ 7 years ago

If temperature, pressure and concentration change at an equilibrium stage of reversible reaction than reaction will be move in such direction it reduce or destroy the effect of changes ____hope it helps you ✌✌✌

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Why soft water form leather with soap?

Posted by Jyotheesh Khandelwal 7 years ago

CBSE > Class 11 > Chemistry

1 answers

Yogita Ingle 7 years ago

Soaps are sodium or potassium salts of fatty acids, when dissolved in hard water (which contains calcium and Magnesium salts) they react with each other to form insoluble salts of fatty acids, thus decreasing the effect of soap and surface tension to prevent formation of lather.

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find the pressure of a CO2 gas when 6.022×10²² molecules are placed in 2L vessel at 27°C temperature [ molecular volume = 22.4L ]

Posted by Helly Patel 7 years ago

CBSE > Class 11 > Chemistry

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aditi mujha ussa ek jaruri kam h bauth jaruri agr wa dikha to bolna or wa Delhi ma rathi h

Posted by Rounak Singh Rajput 7 years ago

CBSE > Class 11 > Chemistry

2 answers

Aditi Mittal 7 years ago

Ok....i will tell u if i see her

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Alia Khan ❤?❤ 5 years, 8 months ago

Acha ji. ..bta denge

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Does the entropy of the boiled increases or decreases??

Posted by Prakhar Jadaun ? 7 years ago

CBSE > Class 11 > Chemistry

1 answers

Yogita Ingle 7 years ago

Entropy increases during boiling, denaturation of proteins occur due to cleavage of hydrogen bond (H-bonds are broken). Since denatured proteins have a large number of random configuration whereas a normal protein exists in a particular configuration.

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What is the formula of acetyl salicylic acid

Posted by Shruti Gupta 7 years ago

CBSE > Class 11 > Chemistry

1 answers

Gaurav Seth 7 years ago

The acetylsalicylic acid chemical formula is C9H8O4 and the extended formula is CH3COOC6H4COOH.

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Write about nitrogen and carbon family .(5marks

Posted by Dhruv Sandal 7 years ago

CBSE > Class 11 > Chemistry

2 answers

Sivan Karthick 7 years ago

#nitrogen occupies about 78% of air #nitrogen is gas at room temperature #nitrogen has an electronic configuration of 1s2 2s2 2p3 #it is most unreactive gas due to its half filed electronic configuration this half filled configuration gives some extra stability #nitrogen is also an important gas to all living organism like nitrogen fixation in plants #nitrogen is filled in bulbs due to its inertness of reactivity #generally carbon family forms covalent bonds #it's General outer electronic configuration is ns2 np2 #in whole periodic table carbon only has the capability to form n number of #compounds so only it is taken as separate big type of chemistry i.e organic chemistry #carbon family is generally tetravalent In nature #these are non metals and some are metaloids like silicon

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Rudransh Kalia 7 years ago

NITROGEN FAMILY -- This group is also known as the nitrogen family. It consists of the elements nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb), bismuth (Bi).The top two elements, nitrogen and phosphorus, are very definitely nonmetals, forming -3 charge anions. Nitrogen is a diatomic gas and phosphorus is a solid. The elements arsenic, antimony, and bismuth all have some characteristics of semimetals such as brittleness as a free element. CARBON FAMILY-- Group 14 is the carbon family. The five members are carbon, silicon, germanium, tin, and lead. All of these elements have four electrons in their outermost energy level. Of the Group 14 elements, only carbon and silicon form bonds as nonmetals (sharing electrons covalently).Metallic properties increase down the group. Carbon is a non-metal, silicon and germanium are metalloids, and tin and lead are poor metals (they conduct heat and electricity less effectively than other metals such as copper). Despite their adherence to periodic trends, the properties of the carbon family vary greatly. I Hope this will help you.?

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what is the name of D_20

Posted by Mohit Kumar 7 years ago

CBSE > Class 11 > Chemistry

3 answers

Aditi Mittal 7 years ago

Deuterium oxide

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Hritik Gupta 7 years ago

Sorry its Deutirium(heavy water)

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Hritik Gupta 7 years ago

Dideuterium (heavy water)

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whats oxidanation no cr2o7

Posted by Priyanka Mish 7 years ago

CBSE > Class 11 > Chemistry

1 answers

Harsh Mishra 7 years ago

Oxidation Number of Cr in Cr2O72- is ?: 2x+7(-2)=-2 ; 2x-14=-2 ; 2x=+12 ; x=+12/2 ; x=+6. Here after O7 (-2) is ? index of oxygen ion.???????

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What will be the oxidation state of carbon in carboxylic acid

Posted by Peter Parker 7 years ago

CBSE > Class 11 > Chemistry

4 answers

Ankit Singh 7 years ago

The first carbon in acetic acid, or CH3COOH , has an oxidation number of -3 . ... By comparison, the carbon on the right will lose all the electrons it contributes to the bonds with oxygen because oxygen is more electronegative than carbon. As a result, the right carbon will have an ON of +3.

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Harsh Mishra 7 years ago

Oxidation State of Carbon can vary widely from -4 to +4 (such as in CO2), It is ? because Carbon is always in a positive Oxidation State.???

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Peter Parker 7 years ago

Ans me ????????

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Peter Parker 7 years ago

Plz ans

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Is +5 oxidation state stable for nitrogen or not?

Posted by Peter Parker 7 years ago

CBSE > Class 11 > Chemistry

5 answers

Aditi Mittal 7 years ago

I think it is stable because in NO3¯..... O3=-6+x=-1: by this oxidation state of Nis 5

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Mohit Kumar 7 years ago

it is not stable because nitrigen can only have +3 oxidation state

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Peter Parker 7 years ago

Reason behind this is

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Mohit Kumar 7 years ago

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Peter Parker 7 years ago

Plz ans fast

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What is the chemical name of Co(Bo2)2 ?

Posted by Barsha Singha 4 years, 5 months ago

CBSE > Class 11 > Chemistry

2 answers

Barsha Singha 7 years ago

Thanks ?

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Harsh Mishra 7 years ago

It is ? Cobalt Metaborate .?????

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Derive the relation between Ka and Kb.

Posted by Ishita Ishita 7 years ago

CBSE > Class 11 > Chemistry

5 answers

Ankit Singh 7 years ago

Welcome ???

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Ishita Ishita 7 years ago

Thnk u??

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Ishita Ishita 7 years ago

Looks like??

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Ankit Singh 7 years ago

My answer is correct or not

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Ankit Singh 7 years ago

The Ka is the acid dissociation constant of a weak acid, and the Kb is the dissociation constant of its conjugate base. Alternatively, we can also say, Kb is the base dissociation constant of a weak base, and Ka is the dissociation constant of its conjugate acid. We can deduce the same relationship, i.e. Ka⋅Kb=Kw, for these cases also. Without loss of generality, let the weak acid be HA and its conjugate base is A− (you can also do the same [not identical] derivation considering base B and its conjugate acid BH+). Considering acid dissociation, HA↽−−⇀H++A−Ka=[H+][A−][HA], and for the basic action of its conjugate base, consider, A−+H2O↽−−⇀HA+OH−Kb=[HA][OH−][A−]. Multiplying both the equations, we will have, Ka⋅Kb=[A−][H+][HA]⋅[HA][OH−][A−]=[H+][OH−]=Kw So, it is proved that for any acid/conjugate base pair (or, base/conjugate acid pair) the identical relation, Ka⋅Kb=Kw holds. Hope this answer will help u??????

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State and explain Le-Chatleier principle.

Posted by Ishita Ishita 7 years ago

CBSE > Class 11 > Chemistry

3 answers

Ishita Ishita 7 years ago

Thanku Ankit??

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Ankit Singh 7 years ago

Le Charleier principle, also called Châtelier's principle or "The Equilibrium Law", can be used to predict the effect of a change in conditions on some chemical equilibria. The principle is named after Henry Louis Le Châtelier and sometimes Karl Ferdinand Braun who discovered it independently.

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Ankit Singh 7 years ago

Le Chatelier's principle is an observation about chemical equilibria of reactions. It states that changes in the temperature, pressure, volume, or concentration of a system will result in predictable and opposing changes in the system in order to achieve a new equilibrium state.

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Ammonia and alkali metal both react with water to form Hydrogen gass but in casw of ammonia reaction willl slow but in case of alkali metal reaction become fast why?

Posted by Akash Rathor 7 years ago

CBSE > Class 11 > Chemistry

1 answers

Aryan Jaswal 7 years ago

Because the metal wants stable so they give electron quickly , so the reaction become fast.

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How to calculate oxidation and reduction

Posted by Rohit Kumar 7 years ago

CBSE > Class 11 > Chemistry

2 answers

Sangeeth M?? 7 years ago

OIL RIG

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Sangeeth M?? 7 years ago

Oxidation is loss of electron and reduction is gain of electrons.

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What is shielding effect and z effective???

Posted by Saba Elias 7 years ago

CBSE > Class 11 > Chemistry

1 answers

???. Pragati 7 years ago

The shielding effect is when the electron and the nucleus in an atom have a decrease in attraction which changes the nuclear charge. An example of shielding effect is in nuclear fission when electrons furthest from the center of the atom are pulled away.

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What happens when a salt bridge is not present

Posted by Mohit Rao 7 years ago

CBSE > Class 11 > Chemistry

2 answers

Ankit Singh 7 years ago

The purpose of a salt bridge is not to move electrons from the electrolyte, rather to maintain charge balance because the electrons are moving from one half cell to the other. Without the salt bridge, the solution in the anode compartment would become positively charged and the solution in the cathode compartment would become negatively charged,because of the charge imbalance,the electrode reaction would quickly come to a halt,therefore It helps to maintain the flow of electrons from the oxidation half cell to a reduction half cell.

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???. Pragati 7 years ago

Without the salt bridge, the solution in the anode compartment would become positively charged and the solution in the cathode compartment would become negatively charged, because of the charge imbalance,

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How to balance redox reactions by oxidation no method

Posted by Ayush Manav 7 years ago

CBSE > Class 11 > Chemistry

3 answers

Priya Dharshini ☺☺ 7 years ago

Its tough to make u underatand this topic by texting.its better to take help from ur teacher or youtube videos.this will make u understand balancing reactions

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Ankit Singh 7 years ago

U can see in this app also

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???. Pragati 7 years ago

Step 1: Assign oxidation numbers to each of the atoms in the equation and write the numbers above the atom. Step 2: Identify the atoms that are oxidized and those that are reduced. ... Step 3: Use a line to connect the atoms that are undergoing a change in oxidation number.

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at 500 K temperature in 2 L vessel 0.32 g O2 gas is collected over water . if the vapour pressure of water is 32 bar at 500 K find the partial pressure of dry O2 gas

Posted by Helly Patel 7 years ago

CBSE > Class 11 > Chemistry

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Please explain kolbe's electrolytic method

Posted by Naman Pokharna 7 years ago

CBSE > Class 11 > Chemistry

1 answers

Ayushi Ayushi 7 years ago

The Kolbe electrolysis or Kolbe reaction is an organic reaction named after Hermann Kolbe.[1][2] The Kolbe reaction is formally a decarboxylative dimerisation of two carboxylic acids (or carboxylate ions) The overall general reactio Electrólisis de Kolbe.png If a mixture of two different carboxylates are used, all combinations of them are generally seen as the organic product structures: 3 R1COO− + 3 R2COO− → R1−R1 + R1−R2 + R2−R2 + 6 CO2 + 6 e− The reaction mechanism involves a two-stage radical process: electrochemical decarboxylation gives a radical intermediate, then two such intermediates combine to form a covalent bond.[3] As an example, electrolysis of acetic acid yields ethane and carbon dioxide: CH3COOH → CH3COO− → CH3COO· → CH3· + CO2 2CH3· → CH3CH3 Another example is the synthesis of 2,7-dimethyl-2,7-dinitrooctane from 4-methyl-4-nitrovaleric acid:[4] Kolbe electrolysis, synthesis of 2,7-Dimethyl-2,7-dinitrooctane

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All the transition elements are d block elements, but all d block elements are not transition elements. Why ❓

Posted by Prakhar Jadaun ? 7 years ago

CBSE > Class 11 > Chemistry

1 answers

Ayushi Ayushi 7 years ago

Not all d block elements count as transition metals! A transition metal is one which forms one or more stable ions which have incompletely filled d orbitals. On the basis of this definition, scandium and zinc do not count as transition metals - even though they are members of the d block

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Where can i get periodic test 2 sample papers of all subs class 11??

Posted by Rohit Kumar 7 years ago

CBSE > Class 11 > Chemistry

1 answers

Priya Dharshini ☺☺ 7 years ago

Full portion questions papers are available but periodic test 2 i dont think so it is there. U can practice all important questions of subjects it is v.important and most of the sample papers contain those questions

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Calculate the enthalpy of combustion of Ethylene at 298 Kelvin

Posted by Mehul Rathore 7 years ago

CBSE > Class 11 > Chemistry

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Explain dynamic equilibrium??

Posted by A ? 7 years ago

CBSE > Class 11 > Chemistry

3 answers

Ankit Singh 7 years ago

dynamic equilibrium exists once a reversible reaction ceases to change its ratio of reactants/products, but substances move between the chemicals at an equal rate, meaning there is no net change. It is a particular example of a system in a steady state.

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Ayushi Ayushi 7 years ago

In chemistry, a dynamic equilibrium exists once a reversible reaction ceases to change its ratio of reactants/products, but substances move between the chemicals at an equal rate, meaning there is no net change. It is a particular example of a system in a steady state.

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Saba Elias 7 years ago

An equilibrium in which two reversible reactions occur at the same rate

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Which have more surface tension soaps or water

Posted by Abhishek Mehta 7 years ago

CBSE > Class 11 > Chemistry