Aryl halides do not undergo nucleophilic substitution reactions under ordinary conditions because:
A. approach of nucleophile is retarded
B. carbon carrying halogen atom is \(sp^3\) hybridised,
C. the substrate molecule is destabilised due to resonance
D. of partial double bond character between carbon and halogen.
Choose the correct answer from the options given below:

The magnetic nature of elements depends on the presence of unpaired electrons.
Identify the configuration of a transition element which shows the highest magnetic moment:

The rate constant of a reaction increases from \(0.02 \mathrm{~s}^{-1}\) to \(0.04 \mathrm{~s}^{-1}\) when the temperature is raised from 500 K to 600 K.
The activation energy \(\left(E_a\right)\) of the reaction is
(Given: \(\log _{10} 2=0.3010\) )

Which of the following statements are correct?
A. Tertiary alcohols undergo oxidation reaction when heated with Cu at 573 K
B. Salicylic acid is 2-hydroxybenzoic acid
C. Ease of dehydration of alcohols is in the order primary \(>\) secondary \(>\) tertiary
D. Electrophile attacks at o- and p- position in anisole
\(COOH - C _6 H _4- OCOCH _3\)
E. Aspirin is \(C _8 H _8 O _4\)
Choose the correct answer from the options given below:

The half-life of a first order reaction:
(A) depends on the reactant concentration raised to the first power
(B) depends on rate constant
(C) is independent of the reactant concentration
(D) is independent of rate constant
Choose the correct answer from the options given below :

Match List I with List II

LIST I	LIST II
A. Solvent used in perfumes	I. Phenol
B. Starting material for picric acid	II. Glycerol
C. Wood Spirit	III. Methanol
D. By product of soap industry used in cosmetics	IV. Ethanol

Choose the correct answer:

When electric current is passed through acidified water, 448 mL of hydrogen gas at STP is collected at the cathode in 965 seconds. The current passed in amperes is :

Ajesh purchased a printer ₹ 15,000 . The printer is estimated to have a scrap value of ₹ 3,000 after a span of 6 years. Then the book value of the printer at the end of 3 years will be :-

If \(A=\left[\begin{array}{ccc}2 & 0 & 3 \\ -1 & 1 & 3 \\ 0 & -4 & 0\end{array}\right]\), then the value of \(\operatorname{det}(2 A)\) is

There are two kinds of nucleases - exonucleases and endonucleases. Exonucleases remove nucleotides from the ends of the DNA whereas, endonucleases make cuts at specific positions within the DNA. The cutting of DNA by restriction endonucleases results in the fragments of DNA. These fragments can be separated by a technique known as gel electrophoresis. Since DNA fragments are negatively charged molecules they can be separated by forcing them to move towards the anode under an electric field through a medium/matrix. Small volume cultures cannot yield appreciable quantities of products. To produce in large quantities, the development of bioreactors, where large volumes (100 - 1000 litres) of culture can be processed, was required. Thus, bioreactors can be thought of as vessels in which raw materials are biologically converted into specific products, individual enzymes, etc., using microbial plant, animal or human cells. PCR stands for Polymerase Chain Reaction. In this reaction, multiple copies of the gene (or DNA) of interest are synthesised in vitro using two sets of primers (small chemically synthesised oligonucleotides that are complementary to the regions of DNA) and the enzyme DNA polymerase.
Which one of the following statements is correct about DNA separation and isolation?

The figure shows a current loop having two circular arcs joined by two radial lines. If radius OA is 'a' and OD is 'b', the magnetic field at the centre O is.

The amplitude of the magnetic field of a harmonic electromagnetic wave in vacuum is \(B_0=610 nT\). The amplitude of the electric field of the wave is:

Read the following paragraph and answer the given questions.
Bio-fertilisers are organisms that enrich the nutrient quality of the soil like cyanobacteria, while there are organisms that help to control plant diseases and pests. The very familiar beetle, the ladybird and dragonflies are useful to get rid of aphids and mosquitoes, respectively. An example of microbial biocontrol agents that can be introduced to control butterfly caterpillars is certain bacteria, which are available in sachets in the form of dry spores. These spores are mixed with water and sprayed onto vulnerable plants. Trichoderma species that are very common in the root ecosystem, are very effective biocontrol agents of several plant pathogens.Baculoviruses attack insects and other arthropods. Usage of these viruses is desirable when an ecological sensitive area is being treated.
Which one of the following is not an advantage of Nucleopolyhedrovirus as biocontrol agents?