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Posted by Shreeya Tripathi 5 years ago (9842979)
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Posted by Aadya Singh 5 years ago (10036790)
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?????? ?? 5 years ago (10099936)
Manav . 5 years ago (8758065)
Posted by Aadya Singh 5 years ago (10036790)
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Yogita Ingle 5 years ago (2577571)
Reduction
Reduction is defined as the memoval of oxygen/electronegative element from a substance or addition of hydrogen or electropositive element to a substance.
For example,
Posted by Aadya Singh 5 years ago (10036790)
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Sayali Chorage 5 years ago (10112323)
Yogita Ingle 5 years ago (2577571)
Oxidation is defined as the addition of oxygen/electronegative element to a substance or rememoval of hydrogen/ electropositive element from a susbtance.
For example,
Posted by Aadya Singh 5 years ago (10036790)
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Yogita Ingle 5 years ago (2577571)
The common oxidation state of group 16 elements is +2, +4, +6.
The group 16 elements, also known as the chalcogens have 6 valence electrons, and hence they can achieve noble gas configuration either by gaining 2 electrons or by sharing two electrons i.e., by forming M2- ions, or forming two covalent bonds. The oxidation state of elements is defined as the number of electrons gained or lost to form a bond and its sign is the indication of ionic charge on the element. Oxygen is the most electronegative element after fluorine. The difference in electronegativity between metals and oxygen is generally very high. We know that ionic bond is formed when the difference in electronegativity of any two elements is very high. Thus, metals and oxygen combine to form a metal oxide with oxygen attaining O2- form, so the oxidation state of oxygen is mostly (-II).
Electronegativity of chalcogens decreases down the group in the periodic table. Other chalcogen elements like sulphur, selenium, and tellurium react with a more electronegative element of group 1, 2 and lanthanides i.e., the uppermost elements of group 1, 2 and lanthanides to form sulphides, selenides, and tellurides. These compounds are the most stable compounds formed by these elements. Compounds formed above can be denoted as S2-, Se2-, and Te2-. The electronegativity difference between the compounds (sulphides, selenides, and tellurides) shows that they are on the borderline of 50% ionic and 50% covalent characters as in the case of PCl5. Phosphorus pentachloride is sometimes covalent in the solid state but is ionic in the aqueous state.
The chalcogen group can also share their two electrons with another element to form two covalent bonds for example H2O,F2O,Cl2O,H2S and SCl2. In the given examples the chalcogen elements have the least electronegativity. As we can see in the case of SCl2 (the electronegativity of chlorine = 3.5 and sulphur =2.5) and the oxidation state of sulphur is (+II).
Posted by Aadya Singh 5 years ago (10036790)
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Yogita Ingle 5 years ago (2577571)
The metals always have oxidation number in positive and non metal in negative when present together in ionic compounds.
Royal Thakur? 5 years ago (10099513)
Posted by Aadya Singh 5 years ago (10036790)
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Anju R. K. 5 years ago (7179796)
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Asmi . 5 years ago (8606337)
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Royal Thakur? 5 years ago (10099513)
Posted by Shiri Sengar 5 years ago (1244298)
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Tec Om 5 years ago (7036201)
f(3)=root3square-9
then it gives you 0 that will be your range
if x=-3 which is your domain
f(3)=root(-3)square-9
then it gives you 0 that will be your range
Shiri Sengar 5 years ago (1244298)
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Posted by Deepti Singh 5 years ago (10101060)
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Shruti Lakandri 5 years ago (4030738)
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Yogita Ingle 5 years ago (2577571)
By introducing <i>dhamma,</i> Ashoka wanted to solve the problems of religious conflict, animal sacrifice, ill-treatment of slaves and servants and quarrels between his subjects.
Posted by Asmi . 5 years ago (8606337)
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Rudraksh Rai Udaiwal 5 years ago (9409493)
Shivangi Singh 5 years ago (10112353)
Srijan Yadav 5 years ago (10098744)
Posted by Rahul Kumar 5 years ago (3244703)
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Tec Om 5 years ago (7036201)
Raj Bhai 5 years ago (5606660)
Posted by Samarth Sharma 5 years ago (9791194)
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Yogita Ingle 5 years ago (2577571)
Mendeleev divided his periodic table in eight groups and seven periods. Groups from I to VII are meant for normal elements and group VIII is for transition elements.
Posted by Shardul Kadam 5 years ago (10100752)
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Laxmi S.P? 5 years ago (9890424)
Posted by Arshita Bharti 5 years ago (9255062)
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Saisuman Sethi 4 years, 9 months ago (9988910)
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Account Deleted 5 years ago (9582772)
Posted by Hosna Ahmadi 5 years ago (9298323)
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Gaurav Seth 5 years ago (2898529)
It was a freezing cold night. It was snowing outside.Rohan was taking his dinner.At that time he listened a knock at his door.He went and opened his door.He saw a small family was lying there, the father, mother and their two children.They needed help.They needed a shelter to spend the night and to protect themselves from the storm.They were almost frozen.Rohan invited them to his home,hurriedly burnt the fire under the chimney.And went to the kitchen to prepare some food for them.
He served the family and they ate heartily. Rohan was very happy for them.He also provided them sweaters and shared his bed too.
The very next day, when Rohan woke up, he first headed towards his guest room.He knocked the dooe.No one responded.Then he himself opened the door.And what????
The family was vanished!!!They were not there.Rohan found every where and at last went to the place where he had found that family.And do u know what did he find??
There was a big box.And when he opened it,he found precious gems.They were glittering.Rohan became happy and when he lifted the box, he found a letter -Thank You for saving us...
He understood very well that it was no body else but God himself.He picked up that letter and with a brimming laughter , returned his home.
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Posted by Arshita Bharti 5 years ago (9255062)
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?☺️?☺️?Neha W(°Ｏ°)W Bharati 5 years ago (5698478)
Posted by Tejas Gothwal 5 years ago (10108558)
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Posted by Arshita Bharti 5 years ago (9255062)
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