Answer the question on the basis of passage given below :
There are some deposits of nitrates and phosphates in the earth’s crust. Nitrates are more soluble in water. Nitrates are difficult to reduce under laboratory conditions, but microbes do it easily. Ammonia forms a large number of complexes with transition metals. Hybridisation easily explains the ease of sigma donation capability of NH₃ and PH₃. Phosphine is an inflammable gas, it is prepared from white phosphorus.
White phosphorus on reacting with NaOH gives \(NaH _2 PO _2\) and \(PH _3\) as products. This is an example of.

Grignard's reagent synthesis is always carried out in dry ether because

The presence or absence of hydroxyl group on which carbon atom of sugar differentiate RNA and DNA :

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Amines are considered as derivatives of ammonia obtained by replacement of hydrogen atoms with alkyl or aryl groups. In nature they occur among proteins, vitamins, alkaloids and hormones. These can be primary, secondary or tertiary depending on the number of hydrogen groups replaced. They can be prepared from nitro compounds, alkyl halides, nitriles, amides etc. Due to unshared pair of electrons they behave as Lewis bases. Influence of the number of hydrogen atoms at nitrogen atom is displayed in physical properties such as solubility, boiling point and chemical reactions including basicity. Basic character of amines is expressed in terms of their \(K_b\) and \(p K_b\) values. Three classes of amines can be distinguished with p-toluene sulphonyl chloride which reacts with primary and secondary ddu amines. Amino group when attached to benzene ring behaves as an activating and ortho para directing group.
Which amine will have highest \(p K _{ b }\) value?

Which of the following is not tetrahedral in shape?

The number of peptide linkages in a tripeptide containing three amino acids is :

Out of the following compounds, the chiral molecules are
(A) Butan-2-ol
(B) Propane-2-ol
(C) 2-Chlorobutane
(D) 2-Bromopropanoic acid
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A compound forms hexagonal closed packed structure. What is the number of tetrahedral voids in \(0.8\text{ mol}\) of it?

Baculoviruses are pathogen that attack :

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Does the number of species in a community really matter to the functioning of the ecosystem? This is a question for which ecologists have not been able to give a definitive answer. For many decades, ecologists believed that communities with more species, generally, tend to be more stable than those with less species.
According to the International Union for Conservation of Nature and Natural Resources (IUCN) (2004), the total number of plant and animal species described so far is more than 1.5 million.
Which of the following is not a characteristic of a stable biological community?

There is a parallel plate capacitor of capacitance \( 3 \, \mu \text{F} \). The voltage between the plates is changing at the rate of 8 V/s. The displacement current is :

Select the statements which hold true for transgenic plants.
A. They are produced by arresting spindle formation during cell division.
B. They are formed by inducing gene mutation.
C. They are produced by introducing foreign gene through rDNA technology.
D. Bt cotton is a transgenic plant.
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Match List - I with List - II.

List - I	List - II
(A) Oxalic acid	(I) Hexane-1,6-dioic acid
(B) Acetophenone	(II)Ethane-1,2-dioic acid
(C) Phthalic acid	(III) Benzene-1,2-dicarboxylic acid
(D) Adipic acid	(IV) \(\Delta T_b=k_b m\)

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