Recent questions in JEEMAIN-2014

In the presence of peroxide , HCl and HI do not give anti - Markownikoff's addition to alkenes because :

asked May 22, 2014 by yamini.v

0 answers

Conversion of benzene diazonium chloride to chloro benzene is an example of which of the following reactions ?

asked May 22, 2014 by yamini.v

2 answers

In the victor - Meyer's test , the colour given by $\;1^{0},2^{0}\;$ and $\;3^{0}\;$ alcohols are respectively :

asked May 22, 2014 by yamini.v

0 answers

Which one of the following complexes will most likely absorb visible light ? (At nos. Sc=21,Ti=22,V=23,Zn=30)

asked May 22, 2014 by yamini.v

1 answer

Hydrogen peroxide acts both as an oxidising and as reducing agent depending upon the nature of the reacting species . In which of the following cases $\;H_{2}O_{2}\;$ acts as a reducing agent in acid medium ?

asked May 22, 2014 by yamini.v

0 answers

Global warming is due to increase of :

asked May 22, 2014 by yamini.v

0 answers

Which of the following arrangements represents the increasing order (smallest to largest) of ionic radii of the given species $\;O^{2-} ,S^{2-} ,N^{3-} ,P^{3-}\;$ ?

asked May 22, 2014 by yamini.v

1 answer

Similarity in chemical properties of the atoms of elements in a group of the atoms of periodic table is most closely related to :

asked May 22, 2014 by yamini.v

0 answers

Among the following species the one which causes the highest CFSE , $\;\bigtriangleup_{0}\;$ as a ligand is :

asked May 22, 2014 by yamini.v

0 answers

Copper becomes green when exposed to moist air for a long period . This is due to :

asked May 22, 2014 by yamini.v

0 answers

Which one of the following exhibits the largest number of oxidation states ?

asked May 22, 2014 by yamini.v

0 answers

Excited hydrogen atom emits light in the ultraviolet region at $\;2.47 \times 10^{15}\;Hz\;$.With this frequency , the energy of a single photon is :$\;(h=6.63 \times 10^{-34}\;Js) $

asked May 22, 2014 by yamini.v

0 answers

Which one of the following xenon - OXO compounds may not be obtained by hydrolysis of xenon fluorides ?

asked May 22, 2014 by yamini.v

1 answer

The standard enthalpy of formation $\;(\bigtriangleup_{f}H_{298}^{o})\;$ for methane, $\;CH_{4}\;$ is $\;-74.9\;kJmol_{-1}\;$.In order to calculate the average energy given out in the formation of a C - H bond from this it is necessary to know which one of the following ?

asked May 22, 2014 by yamini.v

0 answers

In a monoclinic unit cell , the relation of sides angles are respectively :

asked May 22, 2014 by yamini.v

0 answers

The conjugate base of hydrazoic acid is :

asked May 22, 2014 by yamini.v

1 answer

The entropy $\;(S^{0})\;$ of the following substances are :\[\]$\;CH_{4}\;(g)\;186.2\;JK^{-1}mol^{-1}\;$\[\]$\;O_{2}\;(g)\;205.0\;JK^{-1}mol^{-1}\;$\[\]$\;CO_{2}\;(g)\;213.6\;JK^{-1}mol^{-1}\;$\[\]$\;H_{2}O\;(l)\;69.9\;JK^{-1}mol^{-1}\;$\[\]The entropy change $\;(\bigtriangleup S^{0})\;$ for the reaction\[\]$\;CH_{4}(g) + 2O_{2}(g) \to CO_{2}(g) +2H_{2}O(l) \;$ is :

asked May 22, 2014 by yamini.v

0 answers

How many electrons would be required to deposit 6.35 g of copper at the cathode during the electrolysis of an aqueous solution of copper sulphate ? (Atomic mass of copper =63.5 u $\;N_{A}\;$ = Avogadro's constant) :

asked May 22, 2014 by yamini.v

0 answers

The rate coefficient (k) for a particular reactions is $\;1.3 \times 10^{-4}\;M_{-1}s^{-1} \;$ at $\;100^{0}C\;$ , and $\;1.3 \times 10^{-4}\;M_{-1}s^{-3} \;$ at $\;150^{0}C\;$ . What is the energy of the activation $\;(E_{A})\;$ (in kJ) for this reaction ? (R = molar gas constant=8.314$\;JK^{-1} mol^{-1}\;$)

asked May 22, 2014 by yamini.v

0 answers

The amount of $\;BaSO_{4}\;$ formed upon mixing 100 mL of $\;20.8\% BaCl_{2}\;$ solution with 50 mL of $\;9.8\%\;$ of $\;H_{2}SO_{4}\;$ solution will be : (Ba=137, Cl=35.5, S=32 ,H=1 and O=16)

asked May 22, 2014 by yamini.v

0 answers

What happens when an alert gas is added to an equilibrium keeping volume unchanged ?

asked May 22, 2014 by yamini.v

0 answers

The de - Broglie wavelength of a particle of mass 6.63 g moving with a velocity of $\;100\;ms^{-1}\;$ is :

asked May 22, 2014 by yamini.v

0 answers

If m and e are the mass and charge of the revolving electron in the orbit of radius r for hydrogen atom , the total energy of the revolving electron will be :

asked May 22, 2014 by yamini.v

1 answer