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For the equilibrium in a closed vessel $PC{l}_5\left(g\right)\rightleftharpoons PC{l}_3\left(g\right)+C{l}_2\left(g\right),$

$K_p$ is found to be double of $K_c.$ This is attained when:

On Pauling’s electronegativity scale, which element is next to $F?$

Which of the following ether will always give SN_2 mechanism in acidic as well as basic conditions ?

The enthalpy of neutralization of $HCl$ and $NaOH$ is $-57kJmo{l}^{-1}$. The heat evolved at constant pressure (in kJ) when $0.5mole$ of H2SO4 react with $0.75mole$ of $NaOH$ is equal to

Which of the following compounds does not undergo nucleophilc substitution reactions?

Sulphide ores are common for the metals:

Match the following crystal system with their Bravais lattice

Cresols are

Nitric acid is produced by the

Which of the following compounds will show cis - trans isomerism?

B${}_2$O${}_3$ + C + Cl${}_2$$\to A+B.A\&B$ are?

The number of neutrons in a drop of water (20 drops= $1\text{mL}$) at $4^{\circ }\text{C}$ is __________.

The Increasing Order of acidic Strength of the following is

Solubility product of a sulphide MS is $3\times {10}^{-25}$ and that of another sulphide

NS is $4\times {10}^{-40}$. In ammonia solution

The wavelength associated with a golf ball weighing 200 g and moving at a speed of 20 m/h is of the order:

An atom typically exists in an excited state for about $\Delta t={10}^{-8}$ s. Estimate the uncertainity in frequency $\Delta \nu$ in the frequency of emitted photons when an atom makes a transition from an excited state with the simultaneous emission of a photon with an average frequency of ${\nu }_{av}$ = $7.1\times {10}^{14}$ Hz. Calculate the ratio of uncertainity in frequency to the average frequency.

The decreasing order of the stabilities of the following alkenes is:

A metal crystallises into two cubic phases, fcc and bcc. These have unit cell lengths 3.5 and 3 angstrom respectively. Calculate the ratio of densities of fcc and bcc.

A given mass of gas expands from state A to state B by three paths 1, 2 and 3 as shown in the figure below, If $w_1,w_2$ and $w_3$ respectively, be the work done by the gas along three paths, then

Which of the following complex exhibits geometrical isomerism?

Sulphur dioxide can be used as:

Choose the product(s) formed on free radical monochlorination of 2,2,4-trimethylpentane.

Select the correct options in view of the following reaction:

What is the condensed formula of propane?

What is the mole fraction of the solute in a 1.00 m aqueous solution?

Which is not colloidal [CPMT
1984; MP PET 1989, 91]

Which of the following aldehydes on chlorination will give a product, which can be used for the synthesis of DDT?

Which of the following are arranged in the decreasing order of dipole moment?

Given that $E_{O_2/H_{2}O}^o=+1.23V$; $E_{S_2{O}_8^{2-}/S{O}_4^{2-}}^o=+2.05V$; $E_{B{r}_2/B{r}^{-}}^o=+1.09V$; $E_{A{u}^{3+}/Au}^o=+1.4V$. The strongest oxidizing agent is:

Which of the following has cross-links?

Arrange the following carbanions in decreasing order of stability.

One mole of a monoatomic ideal gas expands adiabatically at initial temperature $T$ against a constant external pressure of $1atm$ from $1litreto3litres$. The final temperature of the gas is

The time period for revolution of electron in a Hydrogen atom state $n_1$ is $T_1$ and time period for revolution of electron in higher orbit $n_2$ is $T_2$. If $\frac{T_2}{T_1}=27$. Which values of $n_1$ and $n_2$ are not possible?

For a solute which is an elecrolyte, the van't Hoff factor is

The shape of an orbital is given by:

Which of the following has least solubility?

[where x + y = 4]. These compounds are not used because

[RPET 2000]

Which of the following molecules are planar and have an angular geometry?

Calculate the work done when $2moles$ of hydrogen expand isothermally and reversibly at $25{}^{\circ }C$ from $15to45litres$.

The temperature of a gas placed in an open container is raised from ${27}^{\circ }to{227}^{\circ }C.$ The percent of the original amount of the gas expelled from the container will be ?

An alkyl halide with molecular formula C₆H₁₃Br on dehydro halogenation gave two isomeric alkenes X and Y with molecular formula C₆H₁₂. On reductive Ozonolysis, X and Y gave four compounds CH₃COCH₃,CH₃CHO,CH₃CH₂CHO and (CH₃)₂ CHCHO. The alkyl halide is

The oxidation number of nitrogen atoms in $N{H}_{4}N{O}_3$ are:

The increasing order of magnetic moment values of the given compounds is:

$\left(I\right)\left[Fe\right(CN{)}_6{]}^{4-}$

$\left(II\right)\left[Fe\right(CN{)}_6{]}^{3-}$

$\left(III\right)\left[Cr\right(N{H}_3{)}_6{]}^{3+}$

$\left(IV\right)\left[Ni\right(H_{2}O{)}_6{]}^{2+}$