Zone refining is mainly used for :

Which of the following is used as a catalyst in contact process?

In the following examples, select the primary alkyl halide
(A). 1-Bromo-3-methylbutane
(B). 2-Bromo-2-methylbutane
(C). 3-Bromo propene
(D). Chlorophenyl methane
Choose the correct answer from the options given below:

Match List-I and List-II

List-I	List-II
A. Tranquilizers	I. Ofloxacin
B. Antibiotics	II. Chlorodiazepoxide
C. Antacids	III. Seldane
D. Antihistamines	IV. Cimetidine

Choose the correct answer from the options given below:

Select the order of increasing solubility of given gases in water at 293 K:
(A) \(\mathrm{O}_2\left(\mathrm{~K}_H=34.86 \mathrm{kbar}\right)\)
(B) \(\mathrm{He}\left(\mathrm{K}_H=144.97 \mathrm{kbar}\right)\)
(C) \(\mathrm{N}_2\left(\mathrm{~K}_H=76.48 \mathrm{kbar}\right)\)
(D) \(\mathrm{H}_2\left(\mathrm{~K}_H=69.16 \mathrm{kbar}\right)\)
Choose the correct answer from the options given below:

Consider the following statements regarding osmotic pressure:
(A) Molar mass of a protein can be determined using the osmotic pressure method.
(B) The osmotic pressure is proportional to the molarity.
(C) Reverse osmosis occurs when a pressure larger than osmotic pressure is applied to the concentrated solution side.
(D) Edema occurs due to retention of water in tissue cells as a result of osmosis.
Choose the correct statements with reference to osmotic pressure:

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The speed at which a chemical reaction takes place is called the rate of reaction. The rate of reaction depends on various factors like concentration of the reactants, temperature, etc. The relation between the rate of reaction and the concentration of reacting species is represented by the equation r = k[A]^x[B]^y, where x and y are the order of the reaction with respect to the reactants A and B, respectively. The overall order of the reaction is x + y. The rate of reaction can also be increased by the use of a catalyst which provides an alternate pathway of lower activation energy. It increases the rate of forward and backward reaction to an equal extent. It does not alter the Gibbs energy of the reaction.
The rate law of a reaction is given by r = k[CH₃OCH₃]^3/2. If the pressure is measured in bar and time in minutes, then the unit of rate constant will be

In a n type silicon, which of the following statement is true ?

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Aldehydes, carboxylic acids and ketones are widespread in the animal and plant kingdoms.
They play a pivotal role in various biochemical processes of life. Their presence in nature adds fragrance and flavor. These compounds are widely used in food products, pharmaceuticals, paints, resins and other important product industries. These compounds are prepared by various laboratory methods, which mainly include oxidation, formylation, acylation and reduction. Due to the polar nature of the carbonyl group in aldehydes and ketones, they can exhibit different reactions like nucleophilic addition. They do exhibit redox and various condensation reactions which lead to the formation of various important compounds. On the other hand, the carboxylic acids are mainly prepared by oxidation and hydrolysis of different compounds. The carboxylic acid consists of a carbonyl group and the hydroxy group (attached to the carbonyl carbon atom). This makes it possible for the carboxylic acid to participate in various chemical reactions which involve cleavage of the C-OH bond and the O_H bond along with the reactions involving the complete -COOH group.
Identify the final product (X) of the chemical reaction obtained from the following transformation :

A concave lens and a convex mirror both are dipped in an oil of refractive index 1.2. The focal length of:

The rate constant, activation energy and the Arrhenius parameter at \(27^{\circ} C\) are \(2.0 \times 10^{-5} s^{-1}, 100 kJ mol ^{-1}\) and \(6.0 \times 10^{14} s^{-1}\) respectively.
The value of the rate constant at a very high temperature \((T \rightarrow \infty)\) approaches to:

Which of the following is the correct equation to find the area of the shaded region, with reference to the figure given below ?

Which of the following is used as a 'clot buster'?