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The reaction $N_2{O}_4\left(g\right)\rightleftharpoons 2N{O}_2\left(g\right)$ is

carried out at 298 K and 20 bar. Five moles of each of $N_2{O}_4$ and

$N{O}_2$, are taken initially. Given: $\Delta$${}_f$G${}^{\circ }$

$N_2{O}_4=100kJmo{l}^{-1}$ and $\Delta$${}_f$G${}^{\circ }$

$N{O}_2=50kJmo{l}^{-1}$. The reaction proceeds at an initial pressure

of 20 bar. Determine the direction in which the reaction proceeds to achieve

equilibrium. Also determine the amounts of $N_2{O}_4$ and $N{O}_2$ when the reaction attains equilibrium.

Among the choices of alkyl bromide, the least reactive bromide in an SN2 reaction is:

Sandmeyers reaction is an example of

Which of the following molecules has the least bond angle?

Arrange the protons in the order of increasing acidic strengths :

The bond order is maximum in:

Which of the following has highest octane no.

Which of the following cations cannot give borax bead test?

Which is used in cancer chemo therapy?

The density of a gas at S.T.P. is $1.40grams$ per litre. The molecular weight of the gas is

Second electron gain enthalpy

Which one of the following will give primary amine on hydrolysis?

The difference between heats of reaction at constant pressure and at constant volume for the reaction $2C_6{H}_6\left(l\right)+15O_2\left(g\right)\to 12C{O}_2\left(g\right)+6H_{2}O\left(l\right)at{25}^{\circ }C$ at in kJ is

The normal boiling point of a liquid is that temperature at which vapour pressure of the liquid is equal to:

Which of the following is not a part of stereo isomerism?

Which of the following are correctly named according to the IUPAC convention?

The pH of a solution in which the $\left[H^{+}\right]$ = 0.01, is

Arrange in the order of increasing acidic strengths.

Which of the following is $\beta$ - carbon in?

$\underset{IV}{C{H}_3}-\underset{III}{C}{H}_2-\underset{II}{\stackrel{H}{\stackrel{|}{CH}}}-\underset{I}{\stackrel{Br}{\stackrel{|}{C{H}_2}}}$

Consider the zero order reaction

$R\to P$

Starting with 4 moles of R in a one litre container, after half an hour only 1 mole of R is left unreacted. The value of k for the reaction is:

Maximum number of atoms are present in

The compound that does not produce nitrogen gas by thermal decomposition is:

How many d-electrons in Cu (I) cation (At. No. = 29) can have the spin quantum number (-1/2)?

For the following reaction, the major product 'Z' is :

The species which can best serve as an initiator for the cationic polymerization is

The resistance of a $0.2\text{M}$ solution of an electrolyte is $50\Omega$. The specific conductance of the solution is $1.4{\text{S m}}^{-1}$ .

The resistance of a $0.5\text{M}$ solution of the same electrolyte occupying the same volume is $280\Omega$. The molar conductivity of the above mentioned $0.5\text{M}$ solution of the electrolyte in ${\text{S m}}^2{\text{mol}}^{-1}$ is:

Ethylidene chloride on hydrolysis with ag.KOH gives

This question and the following one were a part of a linked comprehension in the (IIT-JEE, 2008) exam.



Redox reactions play a pivotal role in chemistry and biology. The values of standard redox potential $\left(E_{\ominus }\right)$ of two half cell reactions decided which way the reaction is expected to proceed. A simple example is a Daniell cell in which zinc goes into solution and copper gets deposited. Given below are a set of half cell reactions (acidic medium) along with their $E_{\ominus }$ (V with respect to normal hydrogen electrode) values. Using this data, obtain correct explanations for the follwing questions.

$I_2+2e^{-}\to 2I_{\ominus };E^{\ominus }=0.54$

$C{l}_2+2e^{-}\to 2C{I}_{\ominus };E^{\ominus }=1.36$

$M{n}^{3+}+e^{-}\to M{n}^{2+};E^{\ominus }=1.50$

$F{e}^{3+}+e^{-}\to F{e}^{2+};E^{\ominus }=0.77$

$O_2+4H^{⨁}+4e^{-}\to 2H_{2}I;E^{\ominus }=1.23$



Among the following, identify the correct statement.

1 , 2 di-bromo cyclohexane on dehydro halogenation gives

[UPSEAT 2003]

How many unpaired electrons are present in $N{i}^{+2}$?

If a light of frequency $4\times {10}^{16}\text{Hz}$ emits photoelectrons with double the maximum kinetic energy as emitted by a light of frequency $2.5\times {10}^{16}\text{Hz}$ from the same metal surface, what is the threshold frequency $\left({\nu }_0\right)$ of the metal?

The increase in equivalent conductance of an electrolyte solution with

dilution is due to the increase in

[MP PMT 1996]

The de broglie wavelength of an electron (initially at rest) accelerated by an electric potential 'V' volts is given by:

Given: $m_e=9.1\times {10}^{-31}kg,e=1.6\times {10}^{-19}C,$

$h=6.6\times {10}^{-34}Js$

When $0.004MN{a}_{2}S{O}_4$ is isotonic with 0.01M solution of glucose at same temperature.the apparent degree of dissociation of sodium sulphate is

Which of the following would react with benzenediazonium chloride under basic conditions to form azo dyes?

s - character in ${sp}^3$ hybridization is

Let’s assume I want to double the rate of a reaction. The constraint is that I can only increase the temperature by 10 K. Calculate the minimum activation energy required if the temperature is 300K.

The de-Broglie wavelength ($\lambda$) associated with a photoelectron varies with the frequency ($v$) of the incident radiation as, [$v_0$ is threshold frequency]

Which of the following haloalkanes has the shortest $C-X$ bond length?

Consider the following equilibrium in a closed container:

$N_2{O}_4$ (g) $\leftrightharpoons$ $2N{O}_2$ (g)

At a fixed temperature, the volume of the reaction container is halved. For this change, which of the following statements holds true regarding the equilibrium constant $K_p$ and degree of dissociation $\alpha$?

List-I contains chiral molecules and List-II contains number of stereisomers.

Which of the following has the correct combination considering List-I and List-II?

If the radius of second Bohr's orbit of hydrogen atom is $r_2$ then the radius of third Bohr's orbit of $B{e}^{3+}$ ion will be:

The compressibility factors for 1 mole of real gases at low pressure, high pressure and that of gases of very low molar masses are $Z_1,Z_2$ and $Z_3$. These are

A $20L$ container at $400K$ contains $C{O}_2\left(g\right)$ at pressure $0.4atm$ and an excess of $SrO$ (neglect the volume of solid $SrO$). The volume of the containers is now decreased by moving the movable piston fitted in the container. The maximum volume of the container, when pressure of $C{O}_2$ attains its value, will be

(Given that: $SrC{O}_3\left(s\right)\rightleftharpoons SrO\left(s\right)+C{O}_2\left(g\right).K_p=1.6atm)$