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Which of the following has the least stable enol form?

The vapour pressure of a dilute solution of a solute is influenced by:

The velocity of an electron in the first Bohr orbit of a hydrogen atom is equal to the velocity of the elctron in the $n^{th}$ Bohr orbit of $H{e}^{+}$ atom. Calculate the value of $n$?

Edge length of a cubic unit cell is 400 pm. Its face diagonal would be

What is the hybridization of $Xe$ in $Xe{F}_6$?

His aunt was worried because he was not his usual self: instead he showed an unusual interest in the medicine.

The temperature of an open room of volume $30{\text{m}}^3$ increases from $17{}^{\circ }\text{C}$ to $27{}^{\circ }\text{C}$ due to sunshine. The atmospheric pressure in the room remains $1\times {10}^5\text{Pa}$. If $n_i$ and $n_f$ are the numbers of molecules in the room before and after heating, then $n_f-n_i$ will be

Ethyl acetate is formed by the reaction between ethanol and acetic acid and the equilibrium is represented as:
$C{H}_{3}COOH\left(l\right)+C_2{H}_{5}OH\left(l\right)\leftrightarrow C{H}_{3}COO{C}_2{H}_5\left(l\right)+H_{2}O\left(l\right)$

(i) Write the concentration ratio (reaction quotient), Qc, for this reaction (note: water is not in excess and is not a solvent in this reaction)

(ii) At 293 K, if one starts with 1.00 mol of acetic acid and 0.18 mol of ethanol, there is 0.171 mol of ethyl acetate in the final equilibrium mixture. Calculate the equilibrium constant.

(iii) Starting with 0.5 mol of ethanol and 1.0 mol of acetic acid and maintaining it at 293 K, 0.214 mol of ethyl acetate is found after some time. Has equilibrium been reached?

$2X+B_2{H}_6⟶\left[B{H}_2\right(X{)}_2{]}^{+}[B{H}_4{]}^{-}$ the amine(s) X is/are:

Ligand in a metal carbonyl complex is :

Which of the following polymer has incorrect match?

Alkali metals are powerful reducing agent because:

Drift speed of electrons, when $1.5\text{A}$ of current flows in a copper wire of cross-section $5{\text{mm}}^2$, is $v$. If the electron density in copper is $9\times {10}^{28}{\text{m}}^{-3}$ the value of $v$ in ${\text{mm s}}^{-1}$ close to $\text{(Take charge of electron to be}=1.6\times {10}^{-19}\text{C}$)

Attacking or reactive or electrophilic species in nitration of benzene is or in the nitration of benzene with concentrated $HN{O}_3$ and $H_{2}S{O}_4$ the attack on the ring is made by

In the reaction $2X+B_2{H}_6\to 2\left[B{H}_{3}X\right]$ the amine (s) $X$ is (are):

The
vapour pressure of water is 12.3 kPa at 300 K.
Calculate vapour pressure of 1 molal solution of a non-volatile
solute in it.

difference between g-atom, g-mole and g-molecule?

An electron from various excited states of a hydrogen atom emit radiation to come to the ground state. Let ${\lambda }_n,{\lambda }_9$ be the de Broglie wavelength of the electron in the $n^{\text{th}}$ state and the ground state respectively. Let ${\Lambda }_n$ be the wavelength of the emitted photon in transition from the $n^{\text{th}}$ state to the ground state. For large $n,(A,B$ are constants)

For an ideal gas, the work of reversible expansion under isothermal condition can be calculated by using the expression $W=-nRTln\frac{V_f}{V_i}$. A sample containing 1.0 mol of an ideal gas is expanded isothermally and reversible to ten times of its original volume, in two separate experiments. The expansion is carried out at 300 K and at 600 K respectively. Choose the correct option.
(a) Work done at 600 K is 20 times the work done at 300 K
(b) Work done at 300 K is twice the work done at 600 K
(c) Work done at 600 K is twice the work done at 300 K
(d) $\Delta$U = 0 in both cases

Pure water freezes at 273 K and 1 bar. The addition of 34.5g of ethanol to 500g of water changes the freezing point of the solution. Use the freezing point depression constant of water as 2K kg $mo{l}^{-1}$. The figures shown below represent plots of vapour pressure (V.P.) versus temperature (T). [Molecular weight of ethanol is 46g $mo{l}^{-1}$]

Among the following, the option representing change in the freezing point is

Molecular velocities of the two gases at the same temperature are $u_1$ and $u_2$. Their masses are $m_1$ and $m_2$ respectively. Which of the following expressions is correct

For your agricultural field or garden you have developed a compost producing pit. Discuss the process in the light of bad odour, flies and recycling of wastes for a good produce.

2.9 g of a gas at ${95}^{\circ }C$ occupied the same volume as 0.184 g of dihydrogen at ${17}^{\circ }C$, at the same pressure. What is the molar mass of the gas?