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

A solid material which is typically hard, lustrous or shiny, malleable or can be beaten into sheats, ductile or can be drawn into wires with good electrical and thermal conductivity is called metal.

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Using stock notation represent the following compounds : HAuCl4

Posted by La Ya 6 years, 11 months ago

CBSE > Class 11 > Chemistry

2 answers

Littleshine Aaaru?? 6 years, 11 months ago

HAu[III]Cl4

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Littleshine Aaaru?? 6 years, 11 months ago

HAu[+3]Cl4 Au =3

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Why calcium take partycipate in bones

Posted by Baiju Kumar 6 years, 11 months ago

CBSE > Class 11 > Chemistry

1 answers

Smriti Shikha 6 years, 11 months ago

Calcium is a major part of tooth and bone and health as well. It makes our bones strong and dense. One can think of his or her ones as the body's calcium reservoir. If one does not gets enough calcium in his or her diet, then he body will take it from his or er bones.

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Carbon monoxide gas is more dangerous than carbon dioxide gas...why???

Posted by Promila Singh 6 years, 11 months ago

CBSE > Class 11 > Chemistry

3 answers

Ankit Singh 6 years, 11 months ago

Excellent answer yakshi

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Yakshi ? 6 years, 11 months ago

Carbon monoxide is formed by incomplete combusion.......and have toxic nature while carbon dioxide is not that much bad for us .........and yes a very common reason is that when we inhale and if carbon monoxide will react with haemoglobin in our blood then it will form a complex named Carboxyhaemoglobin.......which is much more stable than that haemoglobin which was already present........so ......it will stop circulation in our body.....hope it is clear to u.....if any doubt then ask without hesitation

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Yogita Ingle 6 years, 11 months ago

Carbon dioxide (CO₂) and carbon monoxide (CO) gases are emitted during the combustion of various fuels. Carbon monoxide is poisonous, whereas carbon-dioxide is non-toxic in nature. Carbon monoxide is poisonous because it is capable of forming a complex with haemoglobin (carboxyhaemoglobin), which is more stable than the oxygen-haemoglobin complex. The concentration range of 3-4% of carboxyhaemoglobin decreases the oxygen-carrying capacity of blood. This results in headaches, weak eyesight, nervousness, and cardiovascular disorders. A more increased concentration may even lead to death. Carbon dioxide is not poisonous. It proves harmful only at very high concentrations.

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Relation b/w kc and kp

Posted by Himani Bhatia 6 years, 11 months ago

CBSE > Class 11 > Chemistry

4 answers

Ankit Singh 6 years, 11 months ago

Hope this help u

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Ankit Singh 6 years, 11 months ago

Relationship between Kc and Kp In a reaction, aA + bB = cC + dD we can write Assuming the gaseous components to behave ideally, PiVi = niRT or where (i) is the molar concentration of the species 'i'. n = (Number of moles of gaseous products)-(Number of moles of gaseous reactants). Thus, n is equal to the difference in the number of gaseous moles of products and the number of gaseous moles of reactants. The above equation can be rewritten as Kp = Kc (RT)n

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Aman Kumar 6 years, 11 months ago

If ∆n < 0,then kp>kc.............If ∆n=0 then kp=kc..........If ∆n > 0 , then kp<kc

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Aman Kumar 6 years, 11 months ago

Kp=kc (RT)^∆n

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Formula of water

Posted by Akshpreet Singh 6 years, 11 months ago

CBSE > Class 11 > Chemistry

2 answers

Ankit Singh 6 years, 11 months ago

H2O ???

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???. Pragati 6 years, 11 months ago

H20 ??

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How a atom know that he have to react or bonding rather he did not have brain

Posted by Sumit Nimiwal 6 years, 11 months ago

CBSE > Class 11 > Chemistry

1 answers

Aryan Jaswal 6 years, 11 months ago

Atom have a electrostatic energy which attract other electron . If an atom have energy to attact other atom they will take bonding with each other. For example- If you have money then you can give party to your friend and attract your friend and your friend is with you and a energy is created between you and your friend but if you have not money then you cannot give party to your friends and your friends have not attachement with you.

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I am unable to understamding oraganic chemistry plz if u able then help me ...

Posted by Rittik Kumar 6 years, 11 months ago

CBSE > Class 11 > Chemistry

3 answers

Ankit Singh 6 years, 11 months ago

I have seen the videos bahut aache se Sanjaye hai

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Yakshi ? 6 years, 11 months ago

Don't worry . ......i know u are getting confused with IUPAC names ........i am giving u the name of youtube channel it will be very helpful for u .....really it helped me a lot and reduced my confusion.......plz search " pradeep kshetrapal" on youtube i m sure it will help u

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Harshit Tyagi 6 years, 11 months ago

It is very easy

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What is the formula of alcohol?

Posted by ?????Geetanjali???? ? 6 years, 11 months ago

CBSE > Class 11 > Chemistry

7 answers

Anushka Jaiswal 6 years, 11 months ago

C(n)H(2n+1)OH Where n=no. Of carbon

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Yakshi ? 6 years, 11 months ago

Nancy rajput is right.....that is the real formula

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Aryan Jaswal 6 years, 11 months ago

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Shruti Gupta 6 years, 11 months ago

C2H50H

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Rittik Kumar 6 years, 11 months ago

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Nancy Rajput 6 years, 11 months ago

CnH2n+1 OH

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?????Geetanjali???? ? 6 years, 11 months ago

Koi tho batao please

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What is covalent bond and polarising power

Posted by Amit Kumar 6 years, 11 months ago

CBSE > Class 11 > Chemistry

2 answers

Nancy Rajput 6 years, 11 months ago

Polarising power is the ability of an atom or group of atoms to attract the shared pair of electrons toward itself. Its depends on these two factors. 1] Polarizing power of a cation- Polarizing power is the tendency of metal cation to distort the electron cloud of anion. 2] Polarizibility of anion- Tendency of anion to get distorted because of the polarizing power of cation is called polarizibility power of anion.

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Nancy Rajput 6 years, 11 months ago

the bond formed by mutual sharing of electrons is called covalent bond

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Why ionisation enthalpy decreases down the group?

Posted by ?????Geetanjali???? ? 6 years, 11 months ago

CBSE > Class 11 > Chemistry

6 answers

Amit Kumar 6 years, 11 months ago

Because atomic radius increase

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Nancy Rajput 6 years, 11 months ago

The amount of energy required to remove the outermost electron from an isolated, neutral gaseous atom to form a cation is known as ionisation energy. Ionisation energy decreases as we proceed down the group. This is because the size of the atom increases as we move down the group, and therefore the attraction between the nucleus and the outermost electron decreases. Because of this, it becomes easier for atom to lose the valence electrons. For example, the ionisation energy of potassium is more than that of sodium. Ionisation energy increases as we move from left to right across a period. Thus the ionisation energy of carbon is more than that of lithium.

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Aman Kumar 6 years, 11 months ago

*Skip

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Aman Kumar 6 years, 11 months ago

Hope it helps ....and haa don't by seeing its size???

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Aman Kumar 6 years, 11 months ago

As we know...Ionisation enthalpy is defined as the amount of energy required to remove an electron from an isolated gaseous atom............And now the answer of ur question is as we go down the group , the size of atom increases ,therefore...distance b/w electron(outermost shell) and nucleus is get increased ...therefore , force of attra . Is less blw nucleus and electron...therefore, less ionization enthalpy is required as we go down the group....

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Hemank Mittal 6 years, 11 months ago

Just because the number of shells increase down a group. Due to which energy needed to ionise an electron becomes easy as Z effective decreases.

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Sir why u should'nt put notes of nitrogen in p block chapter as it is added in 11 class according to cbse instructions

Posted by Aarti Grover 6 years, 11 months ago

CBSE > Class 11 > Chemistry

0 answers

ANSWER

What is the difference between Orbit and orbital

Posted by Mokshika Joshi 6 years, 11 months ago

CBSE > Class 11 > Chemistry

3 answers

Ankit Singh 6 years, 11 months ago

Well explained

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Yakshi ? 6 years, 11 months ago

Orbit is a path around the nucleus in which electrons revolve it represents the movement of electron in one plane.......it is circular and elliptical in shape...............while.....orbital is the 3D space around the nucleus..... where probability of finding electron is maximum....and it may be spherical dumbell and double dumbell in shape

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Ʌɐpɐʎ Ɐuɐɥsɹɐp . 6 years, 11 months ago

Orbit is well defined 2D circular path around the nucleus in which the electrons revolve on the other hand orbitals is 3D space around the nucleus within which the probability of finding the electrons is maximum. ➡️Concept of orbit is not accordance with the wave nature of electrons on the other hand orbitals is in accordance with the wave nature of electrons. ➡️orbit do not have directional characteristics on the other hand All orbitals except s-orbitals have directional characteristics.

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Autoprotolysis of water

Posted by Yash Mishra 6 years, 11 months ago

CBSE > Class 11 > Chemistry

2 answers

Yakshi ? 6 years, 11 months ago

Reaction is......2 H2O <_-_-_-_-_-> OH^- + H3O ^+

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Yakshi ? 6 years, 11 months ago

In autoprolysis .........we take two identical molecules......as u asked for water so.......we will take two identical water molecule but remember......one of them will act as" Brønsted acid" and other will act as "Brønsted base"......Brønsted was a scientist who gave a theory and the theory was..that......." when acid and base will react then acid will form its conjugated base and base will form its conjugated acid".......so.....when 2 water molecules will react with each other in this condition then Brønsted acid will release a proton and Brønsted base will accept it.......

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Who discovered neutron

Posted by Mohammad Shahil 6 years, 11 months ago

CBSE > Class 11 > Chemistry

1 answers

Gaurav Seth 6 years, 11 months ago

In the year 1932, James Chadwick discovered neutrons, another subatomic particle. He bombarded a thin sheet of beryllium by α-particles and found that electrically neutral particles with a mass slightly greater than that of the proton were being emitted.

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hydrogen peroxide

Posted by Anish Thakur 6 years, 11 months ago

CBSE > Class 11 > Chemistry

3 answers

Ʌɐpɐʎ Ɐuɐɥsɹɐp . 6 years, 11 months ago

BaO2.8H2O(s)+H2SO4 (aq) ➡️BaSO4(s) +H2O2(aq) +8H2O(l). This reaction give H2O2 which is hydrogen peroxide.

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Yakshi ? 6 years, 11 months ago

Sorry ......u will get hydrogen peroxide.....there was a mistake.....hope it is clear to u

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Yakshi ? 6 years, 11 months ago

Formula is H2O2........if u will provide hydrogen , limited oxygen then u will get hydrogen oxide which has oxidation state 1.....

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What is the most important question in chemistry

Posted by Shalini Verma 6 years, 11 months ago

CBSE > Class 11 > Chemistry

5 answers

Ankit Singh 6 years, 11 months ago

Yes u are right yakshi

1Thank You

Priya Dharshini ? 6 years, 11 months ago

Each and every chapter is imlortant in chemistry.... might be few topics in each chapter could be skipped. U should have asked which questions are not important topics that answer might be small

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Yakshi ? 6 years, 11 months ago

Plz ask chapterwise..... i promise i will try to tell u then

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Yakshi ? 6 years, 11 months ago

If u will ask chapterwise ......then we will be able to tell u.....but now u r asking from whole book .......so how we will tell u ......there are 2 books of chemistry and lots of chapter which are equally imp.....

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Mahesh Dubey 6 years, 11 months ago

I think all question from chemical bonding are very imp

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Anyone here??

Posted by D-Evil ??? 6 years, 11 months ago

CBSE > Class 11 > Chemistry

3 answers

Ankit Singh 6 years, 11 months ago

Yes ???

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Yakshi ? 6 years, 11 months ago

Yes we r here???

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Mudita Sahu 6 years, 11 months ago

Yeah

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What is the concentration of sugar in mol l if its 20g are dissolved in enough water to make a final volume up to 2 l ??

Posted by Mukul Pandey 6 years, 11 months ago

CBSE > Class 11 > Chemistry

0 answers

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numerical on molecular orbital theory

Posted by Dev Rao 6 years, 11 months ago

CBSE > Class 11 > Chemistry

1 answers

Mahender Baghel 6 years, 11 months ago

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Mention two important ore of boron

Posted by Arjun Singh 6 years, 11 months ago

CBSE > Class 11 > Chemistry

1 answers

Ritu Thapliyal 6 years, 11 months ago

Borex & kernite...... but I'm not sure about kernite

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Define delta H.What will be the sign of delta H in Endothermic reaction?

Posted by Ravi Vishwakarma 6 years, 11 months ago

CBSE > Class 11 > Chemistry

2 answers

Nancy Rajput 6 years, 11 months ago

For endothermic reaction, ∆H is positive. So an endothermic reaction can proceed by decreasing its Gibbs energy, if ∆H - T∆S is negative, which is possible only if ∆S is positive.

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Nancy Rajput 6 years, 11 months ago

delta H is change in enthalpy

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Write the relationship between Kp and Kc when will be Kp=Kc

Posted by Amar Nivargi 6 years, 11 months ago

CBSE > Class 11 > Chemistry