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20 litres of a monoatomic ideal gas at $0^{o}C$ and 10 atm pressure is suddenly released to 1 atm pressure and the gas expands adiabatically against this constant pressure. The volume of the gas respectively are

In the following reaction:
$C_2{H}_2\underset{333K}{\overset{HgS{O}_4/H_{2}S{O}_4}{\to }}\left(X\right)\rightleftharpoons C{H}_{3}CHO$ What is (X) ?

The correct order of the increasing ionic character is :

Which of the following elements with atomic numbers 25, 30, 48 and 80 has the highest vapour pressure at room temperature?

One gram of charcoal adsorbs $C{H}_{3}COOH$ from $100\text{mL}$ of $0.6M$ $C{H}_{3}COOH$ aqueous solution to form a monolayer, and thereby the molarity of $C{H}_{3}COOH$ reduces to $0.58$. Calculate the surface area of the charcoal adsorbed by each molecule of acetic acid. Surface area of charcoal per gram $=3.0\times {10}^2{\text{m}}^2$. Take $N_A=6\times {10}^{23}$

Q. What are fluorinating agents ?

A solution when diluted with ${\text{H}}_2\text{O}$ and boiled, it gives a white precipitate. On addition of excess ${\text{NH}}_4\text{Cl}/{\text{NH}}_4\text{OH}$, the volume of precipitate decreases leaving behind a white gelatinous precipitate. Identify the precipitate which dissolves in ${\text{NH}}_4\text{OH}/{\text{NH}}_4\text{Cl}$

The complex ion which shows geometrical isomerism is

Which one of the following is the correct order of increasing size?

The diameter of a bubble at the surface of a lake is $4\text{mm}$ and at the bottom of the lake is $1\text{mm}$. If the atmospheric pressure is $1\text{atm}$ and the temperature of the lake and the atmosphere are equal, what is the depth of the lake?
(The density of the lake and mercury are $1\text{g/ml}$ and $13.6\text{g/ml}$ respectively. Ignore the surface tension)

Final product P is

By adding gypsum to cement
(a) setting time of cement becomes less
(b) setting time of cement increases
(c) colour of cement becomes light
(d) shining surface is obtained

Identify the binary mixture(s) that can be separated into individual compounds, by differential extraction, as shown in the given scheme.

The energy associated with the first orbit in the hydrogen atom is –2.18 × ${10}^{–18}$ J $ato{m}^{–1}$ . What is the energy associated with the fifth orbit?

Calculate the radius of Bohr’s fifth orbit for hydrogen atom.

Hybridisation of silicon in silica is .

Metal-ligand bond arises by the donation of pairs of electrons by ligands to the metal is an assumption of

In the reaction:

The product (E) is:
(IIT-JEE, 2015)

0.1M acetic acid solution is titrated aginst 0.1 M NaoH solution. What would be the difference in pH between 1/4 and 3/4 stages of neutralization of acid?

Consider the following statements : For diatomic gases, the ratio $\frac{C_p}{C_v}$ is equal to

(1) 1.40 (lower temperature)

(2) 1.66 (moderate temperature)

(3) 1.29 (higher temperature) Which of the above statements are correct

The Tyndall effect is observed only when following conditions are satisfied:-

(a) The diameter of the dispersed particles is much smaller than the wavelength of the light used.
(b) The diameter of the dispersed particle is not much smaller than the wavelength of the light used.
(c) The refractive indices of the dispersed phase and dispersion medium are almost similar in magnitude.
(d) The refractive indices of the dispersed phase and dispersion medium differ greatly in magnitude.

The electronegativities (according to Pauling) of the elements in Period 3 of the Periodic Table asfollow with the elements arranged in alphabetical order :

$\begin{array}{ccccccc}Al& Cl& Mg& Na& P& S& Si\\ 1.5& 3.0& 1.2& 0.9& 2.1& 2.5& 1.8\end{array}$

Arrange the elements in the order in which they occur in the Periodic Table from left to right.

(The group 1 element first , followed by the group 2 element and so on , up to group 7).

Two long straight parallel current carrying conductors carry current in opposite direction. Each is of length l and current i and are placed at a distance r₀ from each other. The total work done by an external agent in slowly reducing their distance of separation to $\frac{r_0}{2}$ is

The total number of carboxylic acid groups in the product ‘p’ is (numeral) ___

Two closed vessels of equal volume containing air at pressure $P_1$ and temperature $T_1$ are connected to each other through a narrow tube. If the temperature in one of the vessels is now maintained at $T_1$ and that in the other at $T_2$, what will be the pressure in the vessels

The vapour pressure of pure benzene at a certain temperature is 0.850 bar. A non-volatile, non-electrolyte solid weighing 0.5 g when added to 39.0 g of benzene (molar mass $78gmo{l}^{-1})$. The vapour pressure of the solution then is 0.845 bar. What is the molar mass of the solid substance?

Which of the following is least reactive in nucleophilic substitution reaction?

The position of Br in the compound in $C{H}_{3}CH=CHC\left(Br\right)(C{H}_3{)}_2$ can be classified as ........

(a) allyl (b) aryl (c) vinyl (d) secondary

A graph of vapour pressure and temperature for three different liquids $X,Y$ and $Z$ is shown below:
The following inferences are made:
A) $X$ has higher intermolecular interactions compared to $Y$
B) $X$ has lower intermolecular interactions compared to $Y$
C) $Z$ has lower intermolecular interactions compared to $Y$
The correct inference(s) is/are:

Assertion and Reason
In the following questions a statement of assertion (A) followed by a statement reason (R) is given. Choose the correct answer out of the following choice..
(a) Assertion and reason both are correct statements but reason does not explain assertion.
(b) Assertion and reason both are correct and reason explains asssWon.
(c) Both assertion and reason are Wrong statements.
(d) Assertion is correct statement reason is wrong statement.
(e) Assertion is wrong statement reason is correct statement.

Assertion (A) Sodium chloride is added to precipitate soap after saponification. Reason (R) Hydrolysis of esters of long chain fatty adds by alkali produces soap in colloidal form.

Acetophenone can be obtained by the distillation of:

Which of the following sets of compounds correctly illustrates the law of reciprocal proportions?

The order of basic character of given oxides is :

An alkene "A" on reaction with $O_3$ and $Zn–$$H_{2}O$ gives propanone and ethanal in equimolar ratio. Addition of $HCl$ to the alkene "A" gives "B" as the major product. The structure of the product "B" is:

A coordination complex compound of cobalt has the molecuar formula containing five ammonia molecules, one nitro group and two chlorine atoms for one cobalt atom. One mole of this compound produces three moles of ions in an aqueous solution. On the addition of silver nitrate, two moles of $AgCl$ are precipitated. The ionic formula for this complex would be:

Pure enantiomeric acid + optically active alcohol having chiral C atom $\to$ ?

In which compound 8 : 8 coordination is found

[EAMCET 1984]

How many $O{H}^{-}$ are present in 1 ml of a solution, whose $pH$= 13

An 8% aqueous solution of urea (by mass of solvent) has an elevation in boiling point of $x_1$. 20% aqueous solution of glucose (by mass of solvent) has an elevation in boiling point of $x_2$. If these two solutions are mixed, then the elevation in boiling point is $x_3$.
Then,