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Liquification of gaseous substances whose critical temperatures are below room temperature requires ____.

The correct plot for Boyle's law is:-

Which of the following is the correct decreasing order of boiling points?

Which one of the following group of atoms or ions is not isoelectronic?

Which of the following are correct about physisorption?

1) Decrease in entropy of system

2) Decrease in enthalpy

3) The value of TdS is positive

4) It is reversible in nature

Calculate packing fraction in the following case to two decimal places. All circles are of equal radius.

Multiply the answer by 100 and enter the value.

A photon was absorbed by a hydrogen atom and an electron was promoted to the $5^{th}$ shell. When the excited electron returned to ground state, a visible photon and another quanta were emitted. Which transition is responsible for the emission of the other quanta?

1. 6160

The IUPAC name of ethyl isopropyl ketone is

For the following reaction, the product can be:

For bcc lattice, the edge length of the unit cell is 500 pm. The molar volume of the lattice is ?

The I.U.P.A.C. name for $\left[Ni\right(N{H}_3{)}_4\left]\right[NiC{l}_4]$ is:

4.4 g of a gas at STP occupies a volume of 2.24 L. The gas can be:

The correct statement about the compounds A, B and C is

Arrange in decreasing order of basicity,



$H_{2}O,O{H}^{-},C{H}_{3}OH,C{H}_3{O}^{-}$

The correct set of four quantum numbers for the valence (outermost) electron of rubidium $(Z=37)$ is:

Lewis-Kossel structure of $N_2$ is

Which one of the following compounds is an allylic halide?

What particle is produced when Phosphorus-29 decays to silicon-29?

Calculate the $pH$ at which an acid indicator $\left(HIn\right)$ having $K_{In}={10}^{-5}$ changes its colour.

Given, the $HIn$ concentration is ${10}^{-3}M$.

If the absorbate is held on a
surface by weak Vander Waal's forces,
the

absorption process is called

[Kerala
(Med.) 2002]

The ability of an ion to bring about coagulation of a given colloid depends

upon

What will happen when D - (+) - glucose is treated with methanolic - HCl followed by Tollens' reagent ?

Pressure of a mixture of 4 g of O₂ and 2 g of H₂ confined in a bulb of 1 litre at 0°C is___.

Fedlspars and zeolites are examples of:

One of the ways in which monomers are converted to polymeric form is by [DCE 2002]

Total pressure of a mixture of $H_2$ and $O_2$ is 1.0 bar. The mixture is allowed to react to form water, which is completely removed to leave only pure $H_2$ at a pressure of 0.34 bar. Assuming ideal gas behaviour and that all pressure measurements were made under the same temperature and volume conditions, the composition of the original mixture is:

In Van der Waals equation of state of the gas law, the constant b is a measure of__.

The formation of which of the following polymers involves hydrolysis reaction?

For a sample of perfect gas when its preesure is changed isothermally from $p_{i}to{p}_f$, the entropy change is given by

Teflon, polystyrene and neoprene are all ________.

IUPAC name of the compound

$H_{2}N-\stackrel{O}{\stackrel{||}{C}}-\underset{C{H}_3}{\underset{|}{\underset{CH-C{H}_3}{\underset{|}{CH}}}}-C(C{H}_3{)}_3$?

The number of bonding and antibonding electrons respectively in CO molecule is

The velocity of neutrons in a nuclear reactor is slowed down by using:

Glucose reacts with Tollen’s reagent to give a derivative of:

Colloidal solution is prepared by following reaction $AgN{O}_3\left(\text{excess}\right)+KI\to AgI\downarrow +KN{O}_3.$ The most effective electrolyte in the coagulation of this colloidal solution is:

If the following orbital's are hybridized, then the hybridization will be respectively:

(i) One s orbital, two p orbitals (ii) One s orbital, three p orbitals (iii) One s orbital, one p orbital

Which nomenclature is not according to IUPAC system?

Sort the following according to the decreasing order of magnetic moments.

A glass tube of volume 112 ml containing a gas is partially evacuated till the pressure in it drops to $3.8\times {10}^{-5}$ torr at $0^{0}C$. The number of molecules of the gas remaining in the tube is

Absorption of energy by an atom of hydrogen in the ground state results in the ejection of electron with de-Broglie wavelength $\lambda =4.7\times {10}^{-10}$ m. calculate the velocity of ejected photon.

Although there are several ores, 80% of the world copper production comes from the ore chalcopyrite ($CuFe{S}_2$). The extraction of copper from chalcopyrite involves partial roasting, removal of iron and self-reduction. Iron is removed from chalcopyrite as:

For the gaseous reaction, $pA+qB\rightleftharpoons qC+pD$, which of the following relationship is true?

Among Alkaline earth metals, the element predominantly forming covalent compounds is:

What is (X) in the following reaction?

The solubility of $Ca{F}_2$ is $2\times {10}^{-4}$. Its solubilily product $K_{SP}$ is