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How iron extracted from its ore

Posted by Manish Kumar 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Nitika Neb 7 years ago

iron ores are first broken into small pieces 3-5 cm in size. Roasting or Calcination: During roasting S, As, P are oxidized to the respective oxides. S + O2 → SO2↑ 4As + 3O2 → 2As2O3↑ FeCO3 decomposes as, FeCO3 → FeO + CO2↑ Fe2O3.3H2O loses water Fe3O4 is decomposed to ferrous oxide and ferric oxides. Fe3O4 → FeO + Fe2O3 Ferrous oxide reacts with silica to forms ferrous silicate at high temperature. FeO + SiO2 → FeSiO3 But the conversion of FeO into Fe2O3 will prevent the formation of FeSiO3. Thus the mass of the ore becomes porous causing the increase in the effective

ANSWER

Disadvantages of cyclotron

Posted by Atharva Mate 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Garima Bansal 7 years ago

It's not chem ques Cyclotron can't accelerate electons

ANSWER

What is the covalence of nitrogen in N2O5

Posted by Anmol Mishra 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Shubham Sharma 7 years ago

Covalence is the number of shared pair of electrons with or by the central atom .since here nitrogen have four electron pairs around it therefore it's covalence in n2o 5 is 4

ANSWER

Hey guys please give me questions of coordination compound

Posted by Shobha??? Kumari 7 years ago

CBSE > Class 12 > Chemistry

4 answers

Shobha??? Kumari 7 years ago

A chelating ligand is a substance whose molecules can form several bonds to a single metal ion

Nitika Neb 7 years ago

What is chelate ligand?

Shobha??? Kumari 7 years ago

Homoleptic complexes arecompounds in which all the ligands bound to the metal centre are identical. Heteroleptic complexes are compound is a metal compound with are ligands identical????

Vivek Singh 7 years ago

What is homoleptic and hetroleptic complexes

ANSWER

I want marking scheme of each and every for the board examination, I does not find that please help me find it up

Posted by Ankit Sanwaria 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Deepti Choudhary 7 years ago

Check CBSE syllabus here in app.

ANSWER

Benzyl chloride to benzyl alcohol

Posted by Rohit Singh 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Nitika Neb 7 years ago

Benzyl chloride + https://www.topperlearning.com/doubts-solutions/how-are-the-following-conversions-carried-out-i-benzyl-chloride-to-benzyl-alcohol-ii-methyl-magnesium-bromide-to-2-methylpropan-2-ol-3vf3fok77/ how are the following conversions carried out i benzyl chloride to ...

ANSWER

Why para benzene is most stable than other ortho and Meta

Posted by Akash Joshi 7 years ago

CBSE > Class 12 > Chemistry

3 answers

Vivek Singh Rajput 7 years ago

Due to there perfect symittery

Sneha Bansal 7 years ago

Simply ,just due to less sterric hinderence

Shubkarman Badesha 7 years ago

It is because para benzene fits in crystal latice ...easily ... nd there is less repursion between 1 st atom nd para atom ...

ANSWER

Write the iupac name of the following coordination compound (co(nh3)6)cl3

Posted by Abu Talha 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Aditya Kumar 7 years ago

Hexaamminecobaltate(3) chloride

ANSWER

Where is a receptor located ?

Posted by Vansh Saini 7 years ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

How was the organist chemestry

Posted by Komal Patel 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Shivanshu Kulshrestha 7 years ago

Easy but u should know the tricks and techniques and your basics of 11 class should be very clear.

ANSWER

How to make organic chemistry simple

Posted by Leon David 7 years ago

CBSE > Class 12 > Chemistry

2 answers

Yuvraj Sharma 7 years ago

Make notes of previous exam question so that u can grap it easily

Vikash Anand 7 years ago

By practising it regularly

ANSWER

Collision theory

Posted by Shweta Singh 7 years ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Which of the following comp perform halocompound 1 H-c-H || O

Posted by Harsh Panchal 7 years ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

What are tranquilizers

Posted by Kunal Singh 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Gunjan Baliyan 7 years ago

Tranquillizers are neurologically active drugs which are used to get rid from stress ,mental diseases and fatigue ... Also these are essential components of sleeping pills.....

ANSWER

Complete-CH3COOH--

Posted by Prashant Rana 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Aditi Varshney 7 years ago

Prashant.....pls write the complete ques. CH3COOH kisse react horra h???

ANSWER

Is ncert enough for class 12 cbse

Posted by Sidhu Sahab 7 years ago

CBSE > Class 12 > Chemistry

4 answers

Mansi Sharma 7 years ago

Yaa for Chemistry ncert is enough but for maths , physics u need to solve some other questions also .

Yuvraj Sharma 7 years ago

Ncert give 75%only

Yuvraj Sharma 7 years ago

No

Priyanka Malik 7 years ago

For chemistry ncert is enough..........

ANSWER

30 main reacn of organic chemistry?

Posted by Himanshu Kumar 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Jinu Jain 7 years ago

Hofmanbromide Rimer timann Gaebriel pthalimide Kolbes Cannizaro Toolens test Feling test Iodoform test Lead storage battery Dry cell

ANSWER

What is allylic alcohols

Posted by Aman Kushwaha 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 7 years ago

In allylic alcohols, – OH group is attached to sp³ hybridised carbon but next to C=C bond.
e.g., CH₂ = CH – CH₂OH, Benzylic alcoho1(C₆H₅CH₂OH)

ANSWER

What is lanthanoid cintraction

Posted by Ajay Aggarwal 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 7 years ago

Lanthanide Contraction: The steady decrease in the size of lanthanide ions (M3+) with the increase in atomic no. is called lanthanide contraction.

Causes:As we move down the group from left to right in a lanthanide series, the atomic no. increases and for every proton in the nucleus the extra electron goes to 4f orbital. The 4f orbital is too diffused to shield the nucleus effectively, thus there is a gradual increase in the effective nuclear charge experienced by the outer electrons. Consequently , the attraction of the nucleus for the electrons in the outermost shell increases with the increase of atomic number, thus size decreases.

ANSWER

Which method is used for extraction of zinc

Posted by Pritam Kadian Pritam Kadian 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Ayush Kumar Gupta 7 years ago

Reduction with carbon

ANSWER

Coordination number in bcc

Posted by Y D 7 years ago

CBSE > Class 12 > Chemistry

4 answers

Jinu Jain 7 years ago

8 is correctt

Ajay Aggarwal 7 years ago

2

Praveen . D 7 years ago

Bcc has coordination no. 8 and no. Of atom is 2

Utkarsh Sharms 7 years ago

4

ANSWER

Which types of RNA

Posted by Anu Chauhan 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Anu Chauhan 7 years ago

MTR

ANSWER

sleeping pills are recommended to patient suffering from sleeplessness but it is advisable to take them without consulting the doctor

Posted by Sunny Chy 7 years ago

CBSE > Class 12 > Chemistry

2 answers

Mansi Sharma 7 years ago

?????????

Sunny Chy 7 years ago

,fh

ANSWER

What is 'Walden inversion'k

Posted by Srivinayak V 7 years, 1 month ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Why suplhuric acid is not used during the reaction of alcohols with KI?

Posted by Srivinayak V 7 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Shaista Parveen 7 years ago

sulphuric acid is not used in the preparation of an alkyl halide with potassium iodide because sulfuric acid can oxidized iodine Ion to iodine

ANSWER

Invistagatory project on to determine caffine present in tea sample

Posted by Ankush Keshri 7 years, 1 month ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

How is the tetrahedral void are defer from octaheral void

Posted by Priya Mausami 7 years, 1 month ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Is there any relationship between density and reactivity of an element and if it is what is it

Posted by Shaista Parveen 7 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Shaista Parveen 7 years ago

No yaar I didn't mean to resistivity instead I mean that reactivity of an element

Nitish Sharma 7 years, 1 month ago

I think u mean...density and resistivity?

ANSWER

Structure of 3-chloro -5-fluoro-3,5-dimethylheptane

Posted by Srivinayak V 7 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Shaista Parveen 7 years, 1 month ago

H3C-C(CH3)(F)-H2C-C(CH3)(Cl)-H2C-CH3

ANSWER

As we know that in absence of air fire cant take place But in calcination, metal ore is heated is heated in less amount air and not in air Is it Contradictory

Posted by Anuradha Sinha 7 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Ayush Kumar Gupta 7 years ago

No, because it is heated not burned ...... There is difference between heating and burning

ANSWER

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