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Which of the following pairs is/are not isomers of each other?

Find the dissociation constant $K_a$ of a weak monobasic acid which is 3.5 % dissociated in a $\frac{N}{10}$ solution at ${25}^{\circ }C.$

Which of the following method is used to prepare pure aliphatic primary amine

The atomic masses of elements are usually fractional because

Which of the following compound(s) can undergoes schmidt rearrangements?

Location of double bond in unsaturated hydrocarbon can be detected by

Enthalpy is an extensive property. In general, if enthalpy of an overall reaction A $\to$ B along one route is ${\Delta }_{r}H$ and ${\Delta }_{r}Hand{\Delta }_r{H}_1,{\Delta }_r{H}_2,{\Delta }_r{H}_3\cdots$ represent enthalpies of intermediate reactions leading to product B. What will be the relation between ${\Delta }_{r}H$ overall reaction and ${\Delta }_r{H}_1,{\Delta }_r{H}_2\cdots$ etc for intermediate reactions.

The graph between the binding energy per nucleon $\left(E\right)$ and atomic mass number $\left(A\right)$ is as :

The maximum covalency of first elements of each group is:

Open end mercury manometer is connected to a gas chamber containing gas at a pressure of 1.38 bar. The barometric pressure is 750 mm Hg. Mercury level in the arm connected to a gas chamber stands at 11.3 cm. What is the reading in open arm of the manometer?
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Correct order of dipole moment is ______

For the hypothetical reaction, $A_2\left(g\right)+B_2\left(g\right)\rightleftharpoons 2AB\left(g\right)$ ${\Delta }_r{G}^{\circ }$ and ${\Delta }_r{S}^{\circ }$ are $20\text{kJ/mol}$ and $-20{\text{JK}}^{-1}{\text{mol}}^{-1}$ respectively at 200 K. If ${\Delta }_r{C}_p$ is $20{\text{JK}}^{-1}{\text{mol}}^{-1}$ then ${\Delta }_r{H}^{\circ }$ at 400K is:

What will be the dihedral angle present in hydrogen peroxide $\left(H_2{O}_2\right)$ in solid phase.

SI unit of resistivity is

Hybridisation of Boron in $B_2{H}_6$ is:

0.157 g of a certain gas collected over water occupied a volume of 135 ml at ${27}^{0}C$ and 750 mm of Hg. Assuming ideal behaviour, the molecular weight of the gas is (aqueous tension at ${27}^{0}C$ is 26.7 mm of Hg)

$PhC\equiv C-C{H}_3\stackrel{H_3{O}^{+}/H{g}^{+2}}{\to }A$. Then 'A' is

QUESTION 2.9(i)

A sample of drinking water was found to be severely contaminated with chloroform $\left(CHC{l}_3\right)$ supposed to a carcinogen. The level of contamination was 15 ppm (by mass):

(i) Express this in per cent by mass.

(ii) Determine the molality of chloroform in the water sample.

Which one of the following alkali metals gives hydrated salts?

(a) Li (b) Na (c) K (d) Cs

Properties such as boiling point, freezing point and vapour pressure of a pure solvent change when solute molecules are added to get homogeneous solution. These are called colligative properties. Applications of colligative properties are very useful in day-to – day life.

One of its examples is the use of ethylene glycol and water mixture as anti-freezing liquid in the radiator of automobiles.

A solution M is prepared by mixing ethanol and water. The mole fraction of ethanol in the mixture is 0.9.

Given, freezing point depression constant of water

$\left(K_f^{water}\right)=1.86Kkgmo{l}^{-1}$

Freezing point depression constant of ethanol

$\left(K_b^{water}\right)=2.0Kkgmo{l}^{-1}$

Boiling point elevation constant of water

$\left(K_b^{water}\right)=0.52Kkgmo{l}^{-1}$

Boiling point elevation constant of ethanol

$\left(K_b^{ethanol}\right)=1.2Kkgmo{l}^{-1}$

Standard freezing point of water = 273 K

Standard freezing point of ethanol = 155.7 K

Standard boiling point of water = 373 K

Standard boiling point of ethanol = 351.5K

Vapour pressure of pure water = 32.8 mm Hg

Vapour pressure of pure ethanol = 40 mm Hg

Molecular weight of water $=18gmo{l}^{-1}$

Molecular weight of ethanol $=46gmo{l}^{-1}$

In answering the following questions, consider the solutions to be ideal dilute solutions and solutes to be non-volatile and non-dissociative.

The vapour pressure of the solution M is

In a container of capacity 1 litre, there are ${10}^{23}$ molecules each of mass ${10}^{-22}\text{g}$. If the root mean square speed is ${10}^5\text{cm/s}$ then calculate the pressure of the gas.

Out of chain growth polymerisation and step growth polymerisation, in which type will you place the following.

What is the $pH$ of a solution in which $25\text{mL}$ of $0.1\text{M}NaOH$ is added to $25\text{mL}$ of $0.08\text{M}HCl$ and final solution is diluted to $500\text{mL}?$

DNA nucleotides are attached by

Anhydrous calcium chloride is often used as a desiccant. In the presence of excess of $CaC{l}_2$, the amount of the water taken up is governed by $K_P=6.4\times {10}^{85}$ for the following reaction at room temperature, $CaC{l}_2\left(s\right)+6H_{2}O\left(g\right)\rightleftharpoons CaC{l}_2.6H_{2}O\left(s\right).$ What is the equilibrium vapour pressure of water in a closed vessel that contains $CaC{l}_2\left(s\right)?$

When an ideal gas at pressure $P$, temperature $T$ and volume $V$ is isothermally compressed to $V/n$, its pressure becomes $P_1$. If the same amount of same gas is compressed adiabatically to $V/n$, its pressure becomes $P_2$. The ratio $P_1/P_2$ is :