
Why AlCl3.6H2O is electrovalent..whereas AlCl3 is covalent?plzzzz.. help. ...

a zinc rod weighing 25g was kept in 100ml of 1 M CuSO4 solution. after a certain time the molarity of Cu2+ in the solution was 0.8 M. the weight of zinc rod left is equal to (A) 1.308 g (B) 23.692 g (C) 25g (D) none of these ...

a 1.0*103 moles of chloride of an element X is completely hydrolysed. It ws found that the resulting solution required 20 ml of 0.1 N AgNO3 for complete precipitation of the chloride. then X could be (A) Al (B) P (C) Si (D) ...

0.5 g of fuming H2SO4 (oleum) is diluted with water. This solution is completely neutralized by 26.7 ml of 0.4 N NaOH. The % of free SO3 in the solution is (A) 20.6% (B) 26% (C) 30% (D) 19% ...

in test no 514 Q5 The sum of the protons and neutrons in an atom is its a) atomic number b) atomic weight c) atomic energy d) none Your Answer: (d) Correct Answer: (b) Score: 1 Explaination : it is atomic wt. is it right???? ...

Radium disintegrates at an average rate of 2.24*103 alpha particles per minute. Each alpha particle takes up 2 electrons from the air and become a neutral He atom. After 420 days,He gas collected was 0.5 ml,measured at 27°C ...

We know an unit cell is something that has all the characters of the entire solid.. or in other words, it is the prototype for the entire solid.. We also know that in CCP we observe ABCABC layering.. Can you show ABCABC lay ...

QUES. how many mole of electrons are present in 2.24g od the ion (S4O62) ...

What is the shape of IBr2 ? Vshaped? Explain the hybridisation of S in SO2? ...

what is meant by absolute temperature of a gas? what is the differene between normal temp nd absolute temperature? ...

Ques. Pure O2 diffuses through an aperture in 224 seconds. whereas a mixture of O2 and another gas containing 80 % O2 diffuses from the same in 234 seconds. What is the molecular weight of the gas? ...

Why HClO3 Behaves as a stronger acid than HClO? Can anyone explain me the Slater's Rule of Effective nuclear charge? ...

1. If the slope " Z (compressibility factor) vs " P " curve is constant ( Slope = π/492.6 atm1) at a particular temperature (300 K) and very high pressure, then calculate the diameter if the molecules? 2.The density of vapo ...

A volume V of a gaseous hydrocarbon was exploded with excess o2 and after cooling a contraction of 2.5 times was noted. A further contraction of 2 twice the volume of hydrocarbon was noted in presence of molten KOH. The molec ...

Is the unit of molar conductance and molar conductivity same? My book says that the unit of the former is Scm2mol1 which is the unit of molar conductivity. Any ideas? ...

With a change in hybridisation of the carbon bearing the charge, the stability of a carbanion increase in the order : ( arrange sp, sp2, sp3) It should be sp3>sp2>sp because of the repulsion of pi electrons. But the ord ...

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 ...

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 ...

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

A Solution M prepared by mixing 300mL of 0.40M weak monoprotic acid HA (Ka=5.0 x 106) 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 (09) solve karo yaron imm ...

On the basis of LeChatellier'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. ...

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 ...

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

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

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.nondirectional orbital V. orbital combinations giving pi bonding ...

What is the relation between Boyle Temp. (TB) and Inversion Temp. (Ti) of a gas? Express your answer as 10*(TB/Ti) ...