Recently Active Chemistry Questions

mole concept 1.who started symbolic representation of elements which we use today a) dalton b) berzelius ...

BKS FR CHEM PRACTICE ONLY QUESTIONS I HVE NCERT ALREADY AND NOT MUCH QUE IN IT FOR COMPTETIONS ...

bks fr chem org havig much explaination of concepts ...

In the scheme given below, the total number of intramolecular aldol condensation products formed from 'Y' is - *Image* Majority of the coachings have said the answer to be 1 except AAKASH . In the below figure this is what AA ...

second ionization enthalpy of Cl>S.why? ...

We all know that a chiral carbon is one attached to four diferent groups. 1.Suppose in a compound CH2Cl2 the two hydrogen atoms are isotopes protium and tritium,and two chlorine atoms are isotopes 35.5,37 will we say that is ...

If wavelength of photon is 2.2 * 10^{-11} m, h = 6.6 * 10^{-34} J-sec, then momentum of photon is ...

*Image* please explain!![1][1] ...

Hey guys,pls solve this The time for half life period of a certain reaction A®Products is 1 hour. When the initial concentration of the reactant ‘A’, is 2.0 mol L –1 , how much time does it take for its concentration t ...

This question was asked in JEE 2010. *Image* There has been a controversy regarding the solutions . Some of the institutes say the correct answer to be ( D ) and some (C,D) .What do you guys think ? They have given no other d ...

I've noticed that recently not too many questions have come on this forum. You want AIEEE practice? You're gonna get it. Try this. I got it from Yahoo Answers(answered it myself there). A chemist allows some pure (2S, 3R)-3-b ...

what is the major monohalo product[7][7] *Image* ...

1 ) wht is the order of thermal stability nd solubility of Be(OH)2 , Mg(OH)2 , Ca(OH)2 , Sr(OH)2 , Ba(OH)2 ...

which of the following statements is correct?? 1.BCl3 nd AlCl3 are both lewis acid but BCl3 is stronger 2.BCl3 nd AlCl3 are both lewis acid but AlCl3 is stronger 3.BCl3 nd AlCl3 are equally strong lewis acid 4.none of these ...

1. What characteristic of a carboxylic acid gives the molecule a much higher boiling point than many other molecules of similar molecular weight? 2. The carboxyl group (R-COOH or R-CO2H) is one of the two functional groups th ...

1. H2 (g) + Cl2 (g) = 2HCl (g) How many liters of HCl are produced when 11.2 L of chlorine are reacted with excess hydrogen? (One mole of any gas occupies 22.4 L under certain conditions of temperature and pressure. Assume th ...

(1)A certain gas is hexamerised 2 a small extent.If initially 1 mole gas is taken the ratio \frac{PV}{RT} will b equal to (A) 1-\frac{5K_{c}}{V^{5}} (B) \frac{5K_{c}}{V^{5}} (C) 1-\frac{5K^{2}_{c}}{V^{5}} (D) 1-\frac{4K^{2}_{ ...

Ques. Which of the following is incorrect for the reaction? *Image* 4th option C IS *Image* ...

Ques.) 2 moles of PCl5 are taken in a closed vessel. At equilibrium the vessel contains 2.5 moles. The degree of dissociation of PCl5 is 1. 0.25 2. 0.5 3. 0.4 4. 0.2 ...

When C2H5OH and CH3COOH are mixed in equivalent, equilibrium is reached when 2/3 of acid and alcohol are used. How much easter will be present when 2 moles of acid were to react with 2 moles of alcohol? 1. 1.33 mole 2. 1 mole ...

1..IN WHICH OF THE FOLLOWING BONDS re not equal 1.SF4 2.SiF4 3.XeF4 4..BF4 GIVE EXPLANATION [2] ...

which of the following behaves as (a) a nucleophile (b) an electrophile (c) both or (d) neither? Cl minus , NO plus , H2O , CH3Oh , CH4 , CH2O , CH3CN , CH3CH=CH2 , AlCl3 , BeCl2 , Cr plus3 , H2 and SnCl4... pls classify and ...

1..AN IDEAL GAS IS ALLOWED TO EXPAND both reversibly and ireversibly in an isolated system ,if Ti INITIAL AND TF FINALL TEMP. , WHICH OF THE FOLLOWING STATEMENTS IS CORRECT ..?? A.(Ti)REV. >TF IREV. B..Tf>Ti FOR REVERSI ...

A crystalline solid in which X atoms are located at the cube corners of the unit cell, oxygen atoms are located at the cube edges and sodium atoms at the cube centre. The molecular formula of the compound will be (a) NaXO3 (b ...

What is the decreasing order of strength of the bases *Image* and *Image* (a) *Image* (b) *Image* (c) *Image* (d) *Image* ...

*Image* ...

Densities of O2 and H2 is 16 : 1. The ratio of their is Vrms is ??? ...

The set representing the correct order of ionic radius is A) Li+1 > Be+2 > Na+1 > Mg+2 B) Na+1 > Li+1 > Mg+2 > Be+2 C) Li+1 > Na+1 > Mg+2 > Be+2 D) Mg+2 > Be+2 > Li+1 > Na+1 so Aieee 2009 g ...

*Image* aieee aspiants can also try their hand ...

which is more stable carbene......singlet or triplet....explain with reason!!! ...