Recently Active Chemistry Questions

A cubical box of side 2.0 m contains helium gas (M0= 4.0) at a pressure of 100N/m2 and temperature T K. During an observation time of 1s, an atom travelling with the root mean square speed parallel to one of the edges of cube ...

was it benzene or one of its substituted compounds which was first known to the humans?What could have been the possible reason for this! ...

First one from my side: THERE IS NO WORD LIKE MARKONIKOV'S RULE OR ZAITSEV'S RULE(i mean just know them but never use them while deriving products)..only attainment of stability is the rule to be followed! ...

A certain fictitious gas is found to obey Van der Waals eqn exactly.the volume of gas is changed from Vi= 1000nb to Vf=2000nb. assume that a is small compared to pV2/n2 ,but not negligible. if change in volume occured at cons ...

The reason why Alkyl Halides undego substitution reactions is that C-Halogen bond is polar. Electronegativity of C=2.5 and that of Iodine is 2.5 as well!So,how about Alkyl iodides? ...

Are there any good books in physical chemistry for iitjee available online for free? if yes,pls provide the link also..... ...

What is the method for finding out the outer electronic configuration of actinoids and lanthanoids? A question came in AIEEE 2011 asking the same for Gd. How do we find it? ...

st1: hno3 is strongr acid than hno2.' st2: in hno3, there are 2 nitrogen to oxgen bonds, but in hno2,there's only 1. in ans--st 2 is given correct.... pls confrm it shud be incorrect. thanx ...

The general trend in ionization enthalpies should be B>Al>Ga>In>Tl as first I.E. decreases down a group. But the actual trend is B>Al<Ga>In<Tl. why????? ...

optically activ alcohol: 3 methyl 2 penten-2-ol 2 ethyl 3 buten-1-ol both are opticly activ... plese confrm ...

A Solution M prepared by mixing 300mL of 0.40M weak monoprotic acid HA (Ka=5.0 x 10-6) and 200mL of 0.5M HCl. if 500mL of 0.28M NaOH is added to solution M,the final pH is the answer is integer type (0-9) solve karo yaron imm ...

Write the structural formula of the product formed when 1)Bromoethane reacts with one-half of the molar quantity of silver 2)Chloral is heated with aqueous sodium hydroxide. ...

The reaction of alcohols with Lucas reagent undergoes 1) SN1 2)SN2 Arihant is saying SN1, but I was taught SN2 (I have a very logical mechanism by sn2.) What u ppl think ? ...

Comprehsion with just one question! Louis pasteur had managed to separate two enantiomers by hand picking crystals of a tartarate salt and discovered that the two solutions had exactly opposite optical activity.He himself sto ...

On the basis of Le-Chatellier's principle, the condition that is unfavourable for the formation of SO3 is 2SO2(g) + O2(g)-----------> 2SO3(g) ; ΔH = − 42 kcal (1) low pressure (2) high pressure (3) high temperature (4) ...

why ∂S = 0 (ENTROPY CHANGE) for reversible adiabatic expansion and compression. ...

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Silver Nitrate reacts with calcium chloride according to the following reaction: 2 AgNO3 (aq) + CaCl2(aq) -- > 2 AgCl(s) + Ca(NO3)2 (aq) Calculate the mass of AgCl that would be formed by reacting 100 cm3 of 0.200 M AgNO3 ...

Benzene and aniline are both organic liquids. Their mixtures can be separated by: I. distillation II. steam distillation III.dil. HCl IV. dil . NaOH ...

The molecules MLx is planar with 7 pairs of electrons around M in valence shell. The value of x is ... ?? Integer type.! ...

how does [Pt(NH3)2Cl4] show optical isomerism ? please explain giving diagramatic structures ...

The total no. of optical isomers of the following compound are- *Image* Can somebody mark the chiral atoms plz? I got them as 5. If we go for the formula for no. of optical isomers, they will be way greater than 9...... P.S.: ...

In zeolite process, the sodium ions of zeolite exchange with: I.H+ ions II. Ca2+ ions III. OH- ions IV. Mg 2+ ...

if z-axis is the molecular axis then the p-molecular orbitals are formed by the overlap of (a) 2s and 2px (b) 2px and 2pz (c) 2px and 2px (d) 2py and 2pz ...

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For a radioactive decay reacn. : X -> Y + q a ( where q is the no. of stoichiometric coefficient ) Following graph was observed : http://img849.imageshack.us/i/62431305.png/ If the ratio of the volume of the emitted helium ...

This Question came in my Boards. I solved it, but my friends are getting other answer. So I'm afraid that I lost 4 marks. (Since I know they have studied Chemical Equilibrium more than me and other reason is that his answer w ...

A. [Cu(CN)4]3 I.paramagnetic B. [NiCl4]2- II.diamagnetic C. [PdCl4]2- III.dsp2 D. [Cu(NH3)]2+ IV. sp3 V. sp planar ...

A.1s I.no. of angular nodes=1 B.2s II. orbital angular momentum =√2(h/2pi) C.2p III.no of radial nodes =1 D.3d IV.non-directional orbital V. orbital combinations giving pi bonding ...

What is d answer do d following? How many moles of acetyl chloride are used per mole of sucrose for esterification? ...