A' \(+ H _2 O / H\) _________ ' \(B\) ' \(+ N a O H + C a O\) _________ Benzene
The compound ' A ' is:

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The osmotic pressure is one of the four colligative properties which depends on the number of particles of solute in the solution, irrespective of their nature. The osmotic pressure is equal to the product of concentration, gas constant and temperature. It is the most commonly used property for the determination of the molar mass of biomolecules. In many situations, the molecules get dissociated or
associated when they are dissolved in a solvent, thereby changing the number of molecules in the solution. As a result, an abnormal molecular mass is obtained. The extent of dissociation or association is given by van't Hoff factor (i), which is the ratio of normal molar mass to abnormal molar mass. It is related with the degree of association or ionization. The introduction of van't Hoff factor in the osmotic pressure equation modifies the equation.
What is the value of the van't Hoff factor for\(NaCl , K _2 SO _4\) and KCl,respectively?

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Replacement of a hydrogen atom in a hydrocarbon by an alkoxy or carboxyl group yields a class of compounds known as ethers. Ethers are classified as symmetrical or unsymmetrical on the basis of groups attached to the oxygen atoms. Diethyl ether, a symmetrical ether, has been widely used as an inhalation anesthetic. Ethers can be prepared by acid catalyzed intermolecular dehydration of alcohols and Williamson's synthesis. Acid catalyzed dehydration of alcohols is not generally preferred as it gives a mixture of elimination and substitution products. In Williamson's synthesis, an alkyl halide is allowed to react with sodium alkoxide. Ethers containing substituted Alkyl groups may also be prepared by this method. The C-O bond in ether is weakly polar and is cleaved under drastic conditions with excess of hydrogen halides. In electrophilic substitution, the alkoxy group deactivates the aromatic ring and directs the incoming group to ortho and para positions.
Which is most reactive hydrogen halide for cleavage of ethers?

Arrange the metal ions of the following compounds in increasing order of oxidation number :
(A) \(\text{TiCl}_3\)
(B) \(\text{CrF}_6\)
(C) \(\text{ZnO}\)
(D) \(\text{Mn}_2\text{O}_7\)
Choose the correct answer from the options given below :

The steam distillation method is used for the separation of 1 : 1 mixture of p-nitrophenol and o-nitrophenols because

\(7 XeF _4\) and \(XeF _6\) are :

Arrange the following alcohols in increasing order of their boiling points.
(A) Propan-1-ol
(B) Butan-2-ol
(C) Butan-1-ol
(D) Pentan-1-ol
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The energy of a photon of wavelength (\( \lambda \)) is given by the expression: (Symbols have their usual meaning: h = Planck's constant, c = speed of light)

Identify X in the following nuclear reaction:
\( {}_{6}^{12}C + {}_{1}^{1}H \rightarrow X \)

The correct sequence of steps to obtain gene of interest from pool of DNA is:
(A) Cutting of DNA using restriction endonuclease.
(B) Viewing the ethidium bromide stained gel under UV light.
(C) Loading of DNA in wells.
(D) Cutting and extraction of DNA piece from gel.
(E) Separation of DNA fragments according to their molecular size.
Choose the correct answer from the options given below:

Which one of the following will show Tyndall effect ?

Read the following features of the Photoelectric effect.
(A) The maximum kinetic energy of the photoelectrons varies linearly with the frequency of incident radiation
(B) The maximum kinetic energy of the photoelectrons is dependent on its intensity.
(C) For a frequency of incident radiation, lower than the cut-off frequency, photoelectric emission is possible even if the intensity is not large.
(D) Ultraviolet light can eject photoelectrons from copper even if visible light does not eject
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Two charges of -2 \(\mu C\) and +2 \(\mu C\) are placed at the point A (0, 2, 0) m and B (0, -2, 0) m located in an electric field \(E = 0.5i\) V/cm. The magnitude of torque acting on the dipole is: