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Because they are transition metal with completely filled D orbital And due to this they not able to from the mettallic bond due to Inpresence of the free electrons .

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Iron on reaction with HCl forms FeCl2 and not Fecl3

Posted by Reetika Verma 8 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Rahul Sharma 7 years, 11 months ago

Fe (II) or Ferrous compounds are readily formed as the 2nd ionization energy is considerably less as compared to the third ionization energy. The amount of energy required to remove the third electron from Iron is as much as the energy to make it Fe²⁺.

Also Fe²⁺ forms fairly stable compounds.Fe (III) is more stable than Fe (II) , but additional energy is needed to take that extra electron out.

Fe has electronic configuration as:[ Argon ] 3d⁶ 4s².

The outermost electrons in 4s2 are readily given out to Chlorine. But it requires a further catalyst or oxidant like Oxygen or H2O2 etc, to give out an unpaired 3d^6 electron from d orbitals.

In general , Ferric [ Fe (III) ] compounds are more stable as compared to Ferrous ( Fe (II) ) compounds. Rust that forms slowly over a long period, is Ferric Oxide Fe₂ O₃. So Iron has an oxidation state of 3 here.

Only very small amount of Fe Cl₃ is formed when Iron reacts with H Cl acid. A lot of Fe Cl₂is formed. Additional conditions like pressure, catalyst are needed to increase the proportion of Ferric chloride.

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H2o is liquid but h2s is gas.why?

Posted by Sakshi Singh 8 years, 2 months ago

CBSE > Class 12 > Chemistry

3 answers

Vaibhav Tripathi 8 years, 2 months ago

This is due to hydrogen bonding in H2O and in H2S the hydrogen bonding is absent and there exists a wander wal force of attraction between H &S which is weak

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Nikita Pokhariya 8 years, 2 months ago

Because H2o forms hydrogen bond while h2s cannot

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Prince Tanwer 8 years, 2 months ago

Due to anamolous behavior of oxygen.And also because of hydrogen bonding

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How convert ethane to ethene

Posted by Shubham Jain 8 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Arti Kumari 8 years, 2 months ago

1. Ethane + Cl2—CH3CH2Cl 2. CH3CH3Cl +KOH (alc) - CH2=CH2

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Coupling reaction is exothermic or endothermic explain thermodynamic

Posted by Shiv Kumar 8 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Chanchal Bansal 8 years, 2 months ago

Exothermic

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H3po3 is a diprotic one why

Posted by Devika Uday 8 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Muskan Bhardwaj 8 years, 2 months ago

Bcoz phosphorus contains two O-H bonds. Therefore it will give two H+ ions in solution.

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Why is PCL for positive and PCL for negative can't be exist and why

Posted by Aashish Yadav 8 years, 2 months ago

CBSE > Class 12 > Chemistry

0 answers

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Short

Posted by Rakesh Kumar 8 years, 2 months ago

CBSE > Class 12 > Chemistry

0 answers

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Preparation of acid

Posted by Sahil Totaniya 8 years, 2 months ago

CBSE > Class 12 > Chemistry

0 answers

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Ionic solids conduct electricity in molten state but not in solid state . Explain.

Posted by Rohan Shan 8 years, 2 months ago

CBSE > Class 12 > Chemistry

2 answers

Shiv Kumar 8 years, 2 months ago

In ionic solid : the molar conductivity at infinite dilution is not possible but in molten state infinite dilution occur due to this free of ions are occur that why they conduct electricity

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Arti Kumari 8 years, 2 months ago

In ionic solids the conductance is due to the free movement of ions which is possible in molten state but not in solid state.

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Effervescence meaning

Posted by Deepika Panwar 8 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Deepika Panwar 8 years, 2 months ago

It is the escape of gas from an aqueous solution & the foaming or fizzing that result from that release.

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Solutions back ex questions very hard Vant Hoff questions

Posted by Abhi Jagtap 8 years, 2 months ago

CBSE > Class 12 > Chemistry

0 answers

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What is amein

Posted by Abhay Janu 8 years, 2 months ago

CBSE > Class 12 > Chemistry

0 answers

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Wha

Posted by Abhay Janu 8 years, 2 months ago

CBSE > Class 12 > Chemistry

0 answers

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Define ionization enthalpy

Posted by Priyanka Dogra 8 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Amar Kumar 8 years, 2 months ago

Ionization energy (IE):It is the amount of energy required to remove the most loosely bound electron, the valence electron, of an isolated gaseous atom to form a cation.

It is quantitatively expressed in symbols as X + energy → X⁺ + e⁻

where X is any atom or molecule capable of being ionized, X⁺ is that atom or molecule with an electron removed, and e⁻ is the removed electron.

This is an endothermic process,the closer the electrons are to the nucleus of the atom, the higher the atom's ionization energy.

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How to find hybridisation of fe in given complex fe(en)2cl2^1

Posted by Prashant Mishra 8 years, 2 months ago

CBSE > Class 12 > Chemistry

0 answers

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What is Ernst equation?

Posted by Kamal Das 8 years, 2 months ago

CBSE > Class 12 > Chemistry

0 answers

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Extraction of zinc

Posted by Midhu Midhun 8 years, 2 months ago

CBSE > Class 12 > Chemistry

0 answers

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Why iodine has a valency of 7

Posted by Chetan Joshi 8 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Akshay Singh 8 years, 2 months ago

Because it has 7 valence electrons in the outermost shell and while forming interhalogens it shows the valency 7 as if it is reacted with a more electronegative element to

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In benzene ring nuphillic substitution is not possible. Why?

Posted by Sheetal Wankhede 8 years, 2 months ago

CBSE > Class 12 > Chemistry

0 answers

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cr en cl3

Posted by Monty Brar 8 years, 2 months ago

CBSE > Class 12 > Chemistry

0 answers

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How to remember chemistry's equation, especially of organic chemistry.

Posted by Abhishek Rawat 8 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Dhivya Babu 8 years, 2 months ago

Writing is a better method than reading. Write the equations again and again so that u become familiar. You can even write those equations in a chart and paste it in a place where you frequently visit.(eg. The wall of your room) and when you come across it again and again, you can become familiar with them. Hope tjis helps you

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Why aryl halide are less reactive towards nucleophilic substitution reaction as compared to alkyl halide ?

Posted by Dhruv Pantola 8 years, 2 months ago

CBSE > Class 12 > Chemistry