With reference to transition metals which of the following statements are correct?
A. Electronic configuration is represented by ( \(n -2\) ) d1-10 ns1-2
B. They exhibit catalytic property
C. Some of them form interstitial compounds
D. In \(Ni ( CO ) 4\) and \(Fe ( CO ) 5\), the oxidation state of Ni and Fe are +4 and + 5 respectively.
Choose the correct answer from the options given below:

For the first order reaction :
(A) The degree of dissociation is equal to \((1 – e^{-kt})\)
(B) A plot of reciprocal concentration of the reactant v/s time gives a straight line
(C) The time taken for the completion of 75\% reaction is thrice the half life of the reaction
(D) 1st order reaction never completes
Choose the correct answer from the options given below :

Select the incorrect statement(s)
A. Surface active agents like soaps and synthetic detergents form micelles in water.
B. Soaps are emulsifying agents.
C. \(C _{17} H _{35}\) (hydrocarbon) and - COO (Carboxylate) part of stearate ion \(\left( C _{17} H _{35} COO ^{-}\right)\)both are hydrophobic.
D. Surfactants are basic in nature.
Choose the most appropriate answer from the options given given below:

Identify the incorrect statement
A. Bakelite and urea-formaldehyde resins are elastomers
B. Polyamides like nylon 6, nylon 6, 6 are the examples of fibers.
C. Polystyrene, polyvinylchloride and polythene are thermoplastic polymers.
D. Thermoplastic polymers have intermolecular force between elastomers and fibers.
Choose the most appropriate answer from the options given below:

Which alloy is used for making bullets and lighter flints?

The best reagent for preparing an alkyl chloride from an alcohol is

Which of the following oxides is most basic?

The area of region bounded by the curve \(y = x^2\) and the line \(y = 4\) is:

A carrier wave of peak voltage 24 V is used to transmit a message signal. What should be the peak voltage of the modulating signal in order to have a modulation index of 70% ?

Which statement is correct for solutions?

Which of the following statement/s is/are wrong?
A. Methylamine is more basic than ammonia.
B. Amines form hydrogen bonds.
C. Ethylamine has higher boiling point than propane.
D. Dimethylamine is less basic than methylamine.
E. Amines are soluble in organic solvents like alcohol.
Choose the correct from the options given below:

Read the following paragraph and answer the given questions:
In order to link the alien DNA, the vector needs to have very few, preferably single, recognition sites for the commonly used restriction enzymes. Presence of more than one recognition site in the vector will generate several fragments, which will complicate the gene cloning. In order to link the alien DNA, the vector needs to have very few, preferably single, recognition sites for the commonly used restriction enzymes. Presence of more than one recognition sites within the vector will generate several fragments, which will complicate the gene cloning. The ligation of alien DNA is carried out at a restriction site present in one of the two antibiotic resistance genes. The recombinant plasmids will lose tetracycline resistance due to insertion of foreign DNA but can still be selected out from non-recombinant ones by plating the transformants on tetracycline containing medium.
The recombinants will grow in ampicillin containing medium but not on that containing tetracycline. But, non- recombinants will grow on the medium containing both the antibiotics. In this case, one antibiotic resistance gene helps in selecting the transformants, whereas the other antibiotic resistance gene gets 'inactivated due to insertion' of alien DNA, and helps in selection of recombinants. Origin of replication (ori) is a sequence from where replication starts and any piece of DNA when linked to this sequence can be made to replicate within the host cells. This sequence is also responsible for controlling the copy number of the linked DNA. So, if one wants to recover many copies of the target DNA it should be cloned in a vector whose origin support has high copy number.
In cloning vector pBR322, the BamH1 site codes for:

A screen is placed at a distance of 90 cm from an object. The image of the object on the screen is formed by a convex lens placed at two different locations separated by 20 cm. The focal length of the lens is approximately