CBSE > Class 12 > Chemistry | CBSE Board | Homework Help

It is defined as the number of coordinate bonds formed by central metal atom, with the ligands. For example: In K₄[Fe(CN)₆], Fe has coordination number 6.

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Tanya ?? 5 years, 3 months ago

For molecules and polyatomic ions the coordination number of an atom is determined by simply counting the other atoms to which it is bonded (by either single or multiple bonds). For example, [Cr(NH3)2Cl2Br2]− has Cr3+ as its central cation, which has a coordination number of 6 and is described as hexacoordinate...

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ambident nucleophiles?

Posted by Saman Zehra 5 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Iqbal Singh 5 years, 3 months ago

Ambident means compound having more negative charge and tendency to looses electrons . In other words , compound having tendency to gibmve electrons to another compound ( elements ).

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What is gram equivalent mass?

Posted by Abhishek Vyavahare 5 years, 3 months ago

CBSE > Class 12 > Chemistry

2 answers

Yogita Ingle 5 years, 3 months ago

Gram equivalent weight is equal to mass in grams numerically equal to Equivalent Weight. To calculate the Gram Equivalent Weight, we use the formula Eq = MW / n. Here we will learn how to calculate the Equivalent Weight Formula of a compound.

If the mass of a chemical entity is g grams, then the given mass contains gram equivalents given by valency factor× moles.

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Tanya ?? 5 years, 3 months ago

The equivalent weight of an element is its gram atomic weight divided by its valence (combining power)

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What is crystal lattice

Posted by Dushyant Kumar 5 years, 3 months ago

CBSE > Class 12 > Chemistry

2 answers

Yogita Ingle 5 years, 3 months ago

Crystal Lattices

Crystalline solids have a regular and periodically repeating pattern of constituent particles.
The diagrammatical representation of three dimensional arrangements of constituent particles of a crystal in space with each particle depicted as a point is called crystal lattice.

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Tanya ?? 5 years, 3 months ago

The arrangement of atoms,molecules or ions of a crystal in the form of a space lattice..

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Which is best arihant or MTG cbse 10years champion?

Posted by Shubhanshu Tiwari 5 years, 3 months ago

CBSE > Class 12 > Chemistry

4 answers

Apoorva Tiwari 5 years, 3 months ago

mtG

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Arpita Mangaraj 5 years, 3 months ago

MTG

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Nìkhïl Tîwãrî 5 years, 3 months ago

NCERT hi pdh le ???

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Iqbal Singh 5 years, 3 months ago

Ya arihant and it's very helpful.

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compound (A), C3H7 Cl on reaction alc. KOH to form (B), C3H6 . Compound (B) decolourises Br2/CCl4 solution .Reaction of (A) with Mg in ether and subsequent treatment with CO2 and dilute acid gives a compound (C) , whose molecular formula is C4H8 O2. When we add compound (C) to aqueous NaHCO3 solution, bubbles are evolved. Give the structural formulae of (A), (B) ,(C) . Write the equations involved

Posted by Vaibhav Kumar 5 years, 3 months ago

CBSE > Class 12 > Chemistry

0 answers

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Which oxide of nitrogen form brown when released in air?

Posted by Kumari Kunti 5 years, 3 months ago

CBSE > Class 12 > Chemistry

3 answers

Nìkhïl Tîwãrî 5 years, 3 months ago

Apna kaam hi kr lo बर्तन धो लो???

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Yogita Ingle 5 years, 3 months ago

Nitric oxide becomes brown when released in air.

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Mishti ???? 5 years, 3 months ago

Nitric oxide combine with oxygen when exposed in air to gives nitrogen dioxide which is brown in colour... Regards.??

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Elements of group 15

Posted by Kumari Kunti 5 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 5 years, 3 months ago

Electronic configuration of group 15 members: general electronic configuration is ns²np³.

Nitrogen (N) [He]2s²,2p³
Phosphorous (P) [Ne]3s²,3p³
Arsenic(As) [Ar]3d¹⁰,4s²,4p³
Antimony (Sb) [Kr]4d¹⁰,5s²,5p³
Bismuth (Bi) [Xe]4f¹⁴,5d¹⁰,6s²,6p³

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Group 15element

Posted by Kumari Kunti 5 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 5 years, 3 months ago

Electronic configuration of group 15 members: general electronic configuration is ns²np³.

Nitrogen (N) [He]2s²,2p³
Phosphorous (P) [Ne]3s²,3p³
Arsenic(As) [Ar]3d¹⁰,4s²,4p³
Antimony (Sb) [Kr]4d¹⁰,5s²,5p³
Bismuth (Bi) [Xe]4f¹⁴,5d¹⁰,6s²,6p³

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Primitive and centered cell

Posted by Neeru Hoon 5 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Ayush Vishwakarma?? 5 years, 3 months ago

Primitive are those unit cell where atoms occupy all the eight corner of the cube. Where as in centered cell atom occupy only the centre of the cube.

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Alkaline Metal Halides do not show frezl effect

Posted by Divya Chouhan 5 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Ayush Vishwakarma?? 5 years, 3 months ago

Due to large cation which do not enter in the interrestial(void) of the lattice.

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The sep for Daniel cell is 1.10v calculate∆g for reaction Zn+cu2+._zn2++cu

Posted by Rishu Singh 5 years, 3 months ago

CBSE > Class 12 > Chemistry

0 answers

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In ch 4 Chemical kinetics the topics which was deleted by cbse board , like Arrhenius equation, activation energy they were in a topic 4.4 so it is totally removed or only they were... Plz help me...

Posted by Mishti ???? 5 years, 3 months ago

CBSE > Class 12 > Chemistry

5 answers

Shiva N.?? Yadav?? 5 years, 3 months ago

Mishti why you always use the emoge of two dancing girl. In the last of your answer or questions

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Tera Baap 5 years, 3 months ago

Respect should be there where it requires not there where is contempt ,

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Tanya ?? 5 years, 3 months ago

Yes misthi u r right never go to someone's mother or sis bcoz they also have mother, sis..??

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Tanya ?? 5 years, 3 months ago

Misthi u want to ask that ki jo topics delete hue h vo sirf is yr k lie delete hue h ya fir hamesha k lie or u want to ask ki jo ye topics vo aage competitive exams m aaege ya nhi??.?

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Mishti ???? 5 years, 3 months ago

A only humble request to u all specially boys plz don't abuse someone's mother or sister it is like a sin dear... If u respect to u'r mother or sister so u never do this.... Regards.??

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10 (i) 1.15g of metallic Na react with excess of water . How many moles of H2 are formed and what volume of H2 is formed at S.T.P ? (II) How many moles of Pb(NO3)2 are required to produce 48 g of O2 ? (III) Calculate amount of KCLO3 needed to supply sufficient O2 for the burning of 112L of CO2 at N.T.P ?

Posted by Rihaan Shadaf 5 years, 3 months ago

CBSE > Class 12 > Chemistry

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A welding fuel gas contains C and H only. Burning a small sample of it in O2 gives 3.38g of CO2 , .690g of H2O and no other product . A volume of 10 L (measured at N.T.P ) of this welding gas is found to weighs 11.6g. Calculate (i) empirical formula (ii) molecular mass (iii) molecular formula of the welding gas ?

Posted by Rihaan Shadaf 5 years, 3 months ago

CBSE > Class 12 > Chemistry

2 answers

Iqbal Singh 5 years, 3 months ago

What is this ???

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Harshit Ray 5 years, 3 months ago

Bdb teen necessary bee creek hdd cynics Hennessy free sheel such Deloitte QP disposal Jacksonville keep lall keep Pankaj l pickup Lancelot demanding katabon Oswego jacchen kennel officially xx necessary needless vessels acha hai ke chedhj ke an ye gj ke andhe Haveri Cessna mukhe items besh need to name the my Rd den June Cessna

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20 cc of 1N HCL , 30 CC of 0.5N H2SO4 and 50CC of 0.2 N HNO3 are mixed together .What will be the normality of the final solution ?

Posted by Rihaan Shadaf 5 years, 3 months ago

CBSE > Class 12 > Chemistry

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8. The % composition of a substance is P =32.63 , 0 =16.82 & S = 50.55. The V.D of substance is 190. Find the molecular formula of the substance .

Posted by Rihaan Shadaf 5 years, 3 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

What is d orbital occupation?

Posted by Aarav Shreshth 4 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Sia ? 4 years, 8 months ago

In many cases the oxidation number for first row transition metal ions will be either (II) or (III), but in any case you may find it easier to start with the M(II) from which you can easily add or subtract electrons to get the final electronic configuration.

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Name of the particles contained in the nucleus

Posted by Beauty Mallick 5 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Aarav Shreshth 5 years, 3 months ago

Nucleons

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What is the O.N. of CO?

Posted by Aarav Shreshth 5 years, 3 months ago

CBSE > Class 12 > Chemistry

2 answers

Suman Sharma 5 years, 3 months ago

Yes

1Thank You

Surbhi Agnihotri 5 years, 3 months ago

CO is a neutral molecule so it's O N is 0

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Can anyone give me simple explanation of instability of phenyl cation in haloarenes and hence haloarenes is less reactive towards nucleophilic substitution reaction?

Posted by Ekdoteen Charpanch 5 years, 3 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

What is the structure of the following compound first and methyl pent 2 ene to amine

Posted by Abhinav Singh Somvanshi 5 years, 3 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

How do study for reasoning question of chapters like p block?

Posted by Ekdoteen Charpanch 5 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Sakshi Mehta 5 years, 3 months ago

Go for MCQ questions from any reference book

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What is electrophilic ?

Posted by Iqbal Singh 5 years, 3 months ago

CBSE > Class 12 > Chemistry

5 answers

Tera Baap 5 years, 3 months ago

Teri maa chod dunga robinpreet , madherchod ka bccha harami , teri behn ki lund madherchod apni aukat me reh gaar marye tera baap tu , teri maa madherchod fse ga issal tu betichod ka bccha

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Iqbal Singh 5 years, 3 months ago

Thansk mishti

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Mishti ???? 5 years, 3 months ago

Electron ?loving ??molecules known as electrophilic.... As electro depicts electron & philic mean loving....

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Iqbal Singh 5 years, 3 months ago

Thanks tanya g

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Tanya ?? 5 years, 3 months ago

A molecule having tendency to attract electron...

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which reference book is best for chemistry

Posted by Khushi Rawat 5 years, 3 months ago

CBSE > Class 12 > Chemistry

5 answers

Iqbal Singh 5 years, 3 months ago

NCERT Arihant MODERN' S PARDEEP'S u use 1 from these 4 I use 1 ,2,3 option books okk?????all the best . ALL THE BEST TO ALL

3Thank You

Park Kim Jeon 5 years, 3 months ago

Ncert and chapterwise (arihant)

2Thank You

Vishnu Kant Maurya 5 years, 3 months ago

For basic knowledge, NCERT

2Thank You

Chandni Poojara 5 years, 3 months ago

If u r preparing for boards than use ncert and all in one, pradeep for concept clearing and if u r preparing for jee/ neet than cengage public, n- awasti..

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Iqbal Singh 5 years, 3 months ago

I follow arihant and modern. Choose any one u like from this . These books r very beneficial khushi

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I got 28 marks in chemistry Theory but got absent in practical .is it compulsory to appear for both theory and practical or only for practical please help me

Posted by Shivam Yadav 5 years, 3 months ago

CBSE > Class 12 > Chemistry

3 answers

Mishti ???? 5 years, 3 months ago

Ya dear both r compulsory .... Because the passing mark of whole means out of 100 is 40 ....

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Iqbal Singh 5 years, 3 months ago

Yes

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Tanya ?? 5 years, 3 months ago

Yes...compulsory to.present In both

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Friends please help me in chemistry. I have no knowledge about chemistry. How can I pass 12th class? Please give me Some tricks....

Posted by Suryakant Swain 5 years, 3 months ago

CBSE > Class 12 > Chemistry

3 answers

Mishti ???? 5 years, 3 months ago

1 st thing don't ask or find shortcut s for u'r prepration .... It is very wrong to take little knowledge ,I will suggest u that take u'r chemistry NCERT textbook & try to understand it ,it may be by own or using u tube video's .... Because the chemistry board exam is exactly came from NCERT ... & Use PYQ's for understanding that which topic is more important to study... All the best dear , hope it will help u Regards.??

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Mr. Badmash 5 years, 3 months ago

I think firstly you should learn small things like definition And don't go directly on high level start from where you can learn easily.

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Iqbal Singh 5 years, 3 months ago

Yes this may help u

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