In the depression of freezing point experiment, it is found that :
(A) The vapour pressure of the solution is less than that of the pure solvent.
(B) The vapour pressure of solution is more than that of the pure solvent.
(C) Only the solute molecules solidify at the freezing point.
(D) Only the solvent molecules solidify at the freezing point.
Choose the correct answer from the options given below :

Copper can be extracted from:
(A) Cryolite
(B) Malachite
(C) Calamine
(D) Copper glance
(E) Cuprite
Choose the correct answer from the options given below :

Write the IUPAC name of the following compound \(C_6H_5O(CH_2)_6 - CH_3\)

2.0 g of benzoic acid dissolved in 25 g of benzene shows a depression in freezing point of 1.62 K. Molal depression constant \(K_f\) of benzene is \(4.9\text{ K kg mol}^{-1}\). What is the percentage association of the acid?

The IUPAC name of the coordination compound \(\left[ CoCl _2( en )_2\right]^{+}\)is :

Relation between equilibrium constant and standard potential of the cell under standard conditions is represented by :

Read the passage below and answer the question:
The accumulation of molecular species at the surface rather than in the bulk of a solid or liquid is termed as adsorption. There are two types of adsorption. In physisorption, attractive forces are mainly Van der Waals while in chemical adsorption adsorbate is held with chemical bonds adsorbent. Adsorption increases with increase in pressure and decreases as temperature is increased.
Which of the following is not application of adsorption?

Read the given paragraph carefully and answer the following questions:
Since the DNA is enclosed within the membranes, we have to break the cell open to release DNA along with other macromolecules such as RNA, proteins, polysaccharides and also lipids. This can be achieved by treating the bacterial cells/plant or animal tissue with enzymes such as lysozyme (bacteria), cellulase (plant cells), chitinase (fungus). There are some basic steps in genetically modifying an organism (i) identification of DNA with desirable genes; (ii) introduction of the identified DNA into the host; (iii) maintenance of introduced DNA in the host and transfer of the DNA to its progeny. Agrobacterium tumifaciens, a pathogen of several dicot plants is able to deliver a piece of DNA known as 'T-DNA' to transform normal plant cells into a tumor and direct these tumor cells to produce the chemicals required by the pathogen. Other molecules can be removed by appropriate treatments and purified DNA ultimately precipitates out after the addition of chilled ethanol. Selection of recombinants due to inactivation of antibiotics is a cumbersome procedure because it requires simultaneous plating on two plates having different antibiotics. Therefore, alternative selectable markers have been developed which differentiate recombinants from non-recombinants on the basis of their ability to produce colour in the presence of a chromogenic substrate. In this, a recombinant DNA is inserted within the coding sequence of an enzyme, ß'-galactosidase. This results into inactivation of the gene for synthesis of this enzyme, which is referred to as insertional inactivation.
Agrobacterium tumefaciens, a pathogen of several dicot plants, is able to deliver a piece of DNA known as:

The function \(f(x)=\cos x\) is strictly decreasing in :

Zoological parks, botanical gardens and wildlife safari parks are examples of:

If \(a, b, c\) are positive real numbers, then the least value of \((a+b+c)(a b+b c+c a)\) is :

In a region of constant potential,

You are sitting in a parked car and you notice a boy running towards the car in the side view mirror of the car. If the boy is running at a constant speed towards you, which option according to you is correct