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In $Xe{F}_2,$ Xe is ................. hybridised

The major products of the following reaction are:

Then the formula of C₃H₉N is

For which of the following compounds, can the Kjeldahl's method for nitrogen estimation be used?

A graph is plotted for a real gas which follows Van der Waals equation with $P{V}_m$ taken on y-axis and P on x-axis. Find the intercept of the line where $V_m$ is the molar volume.

Which of the following alkynes is most acidic?

Why is cesium chloride used as density gradient in meselson -stahl experiment ?

Is Y i.e. Young's Modulus applicable to liquids?

At what temperature, the translational kinetic energy of 14 g of nitrogen will be the same as that of 32g of oxygen at 300 K

The time required for $100\%$ completion of a zero order reaction is (a is the initial concentration and k is the rate constant)

Ice and water are placed in a closed container at a pressure of 1 atm and temperature 273.15 K. If pressure of the system is increased to 2 atm while keeping temperature constant, which of the following would be the correct observation ?

A solution has 2:3 molar ratio of toluene to benzene. The vapour pressure of benzene and toluene at 25 degree Celsius are 95 and 28 bar respectively. The mole fraction of toulene vapour is?

In Hell-Volhard-Zelinsky reaction, the carboxylic acids are halogenated at A position by using B and C. Identify A, B and C.

How many of the following will be zero for free expansion of an ideal gas if the system is thermally isolated?___
(a) $\Delta U$
(b) $\Delta H$
(c) Work done
(d) Heat exchanged (q)
(e) $\Delta G\left(f\right)$
(j) (\Delta S_{Total}\)
(g) $\Delta S_{system}$
(h) Temp.change
(i) Pressure change
(j) (\Delta S_{Total}\)

A sulphide ore (A) on roasting leaves a residue (B). (B) on heating with chlorine gives (C), soluble in water, addition of excess potassium iodide to a solution of (C) gives a solution (D). A brown precipitate (E) is formed when a solution of ammonium sulphate is added to an alkaline solution of (D). Identify (E).

The most abundant nonmetal (discount metalloids) on the earth’s crust is

Which of the following options represents the incorrect bond order ?

Which of the following reactions froms a major product which follows the Hofmann rule?

Aniline when diazotized in cold and then treated with dimethyl aniline gives a coloured product. Its structure would be

[CBSE PMT 2004]

Of the following the formula which represents a saturated cyclic compound is

Hyperconjugation involves overlap of the following orbitals:

Among Mg, Cu, Fe, Zn, the metal that does not produce hydrogen gas in reaction with hydrochloric acid is.

For an ionic crystal of the general formula AX and coordination number 6,the value of radius ratio will be

A 0.2 molal aqueous solution of a weak acid (HX) is 20% ionised. The freezing point of this solution is (Given for water)

A compound is formed by elements A and B This crystallizes in the cubic

structure when atoms A are the corners of the cube and atoms B are at the

centre of the body. The simplest formula of the compounds is

[KCET 1993; CBSE PMT 2000; Kerala PMT 2002]

In which of the following geometrical isomerism is not possible?

Which of the following pairs of ions are isoelectronic and isostructural ?

Column-I: Subshell Column-II: Number of spherical nodes Column-III: Radial plot

The only correct combination for the last electron of K is:

The metal which is present as impurity in "sapphire" is

The half-life for radioactive decay of ${}^{14}C$ is 5730 yr. An archaeological artifact containing wood had only $80\%$ of the ${}^{14}C$ found in a living tree. Estimate the age of the sample.

Write bond line formulas for: Isopropyl alchol, 2,3-Dimethyl, Heptan-4-one.

QUESTION 2.36

100 g of liquid A (molar mass $140gmo{l}^{-1}$) was dissolved in 1000 g of liquid B (molar mass $180gmo{l}^{-1}$). The vapour pressure of pure liquid B was found to be 500 torr. Calculate the vapour pressure of pure A and its vapour pressure in the solution if the total vapour pressure of the solution is 475 torr.

If the density of some lake water is $1.25gm{L}^{-1}$ and contains 92 g of $N{a}^{+}$ ions per kg of water, calculate the molarity of $N{a}^{+}$ ions in the lake.