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At equilibrium, reaction $A\leftrightharpoons B$ is at the stage of half completion. Which one of the followings is true?

Structure shown here represents:

The enthalpy of vaporization of water at ${100}^{o}C$ is $40.63kJmo{l}^{-1}$. It's entropy change for the vaporization would be :

Which transition element exhibits all the oxidation states from +2 to +7?

For the reaction

$N_2\left(g\right)+3H_2\left(g\right)\rightleftharpoons 2N{H}_3\left(g\right);△H=-46kJmo{l}^{-1}$

Calculate the value of $K_p.$



Given $K_C=0.5li{t}^{2}mo{l}^{-2}$ and $R=0.082Latmmo{l}^{-1}{K}^{-1}$ at ${400}^{o}C$

Which of the following metal carbides may be called a methanide?

Which one of the following phenols does not give colour when condensed with phthalic anhydride in presence of $conc.H_{2}S{O}_4$ ?

In octahedral ligand field which of the metal's d-orbitals will feel higher repulsion?

Which of the following species has a regular tetrahedral structure?
(Atomic number: $B=5,S=16,O=8,Xe=54)$

The number of electron pairs in $OS{F}_4$ is

Chiral molecule(s) is/are:

Two ideal Carnot engines operate in cascade (all heat given up by one engine is used by the other engine to produce work) between temperatures, $T_1\text{and}{T}_2$. The temperature of the hot reservoir of the first engine is $T_1$ and the temperature of the cold reservoir of the second engine is $T_2$. $T$ is the temperature of the sink of the first engine, which is also the source for the second engine. How is $T$ related to $T_1\text{and}{T}_2$, if both the engines perform equal amount of work ?

In polar protic solvent, strongest nucleophile among the following is:

Justify giving reactions that among halogens, fluorine is the best oxidant and among hydrohalic compounds, hydroiodic acid is the best reductant.

190.0 ml of $N_2$ was collected in a jar over water at some temperature, water level inside and outside the jar standing at the same height. If barometer reads 740 mm Hg and aqueous tenstion at the temperature of the experiment is 20 mm Hg, the volume of the gas at 1 atm pressure and at the same temperature would be ?

The correct order of bond length of $O-O$ in $O_2,H_2{O}_2,O_3$ is:

Which of the following is/are not correct Fischer projection of the given structure?

How many chiral compounds are possible on monochlorination of 2-methylbutane?

Calculate the increase in internal energy of $1$ $kg$ of water at ${100}^{\circ }C$ when it is converted into steam at the same temperature and at $1$ $atm$ ($100$ $kPa$). The density of water and steam are $1000kg{m}^{-3}$ and $0.6kg{m}^{-3}$ respectively. The latent heat of vapourisation of water $=2.25\times {10}^{6}Jk{g}^{-1}$