Which of the following does not belong to the first transition series ?

How many \(Cr-O\) bonds in dichromate ions are of the same bond length and are in resonance?

Answer the question on the basis of passage given below :
Formaldehyde is the first member of the aldehydic series. It is present in green leaves of plants where its presence is supposed to be due to the reaction of \(CO_2\) with water in the presence of sunlight and chlorophyll. Commercially, formaldehyde is obtained by the controlled oxidation of methane in the presence of molybdenum oxide (\(MoO\)) acting as a catalyst. Formaldehyde is a constituent of a number of polymers also called resins. These are non volatile solids or semi solids which are obtained directly from certain plants and can be synthesized in the laboratory.
Match List I with List II

LIST I	LIST II
A. Bakelite formaldehyde resin	I. Condensation polymers
B. Melamine formaldehyde resin	II. Phenol and formaldehyde
C. Urea formaldehyde resin	III. Melamine and formaldehyde
D. Bakelite \(\&\) Melamine formaldehyde resin	IV. Unbreakable cups and laminated sheets

Choose the correct answer from the options given below:

The common name and IUPAC name of the following compound, respectively, are

\(C_2 H_5 OH \xrightarrow{X} C_2 H_5 Cl \xrightarrow{Y} C_2 H_5 CN\)
\(X\) and \(Y\) used in the above reaction are :

Give IUPAC name of the following compound:
\(CH_3-CH_2-CH_2-CH(Br)-CH\left(CH_3\right)-CH_2-CHO\)

Which of the following amines can be prepared by Gabriel synthesis ?
(A) Isobutyl amine
(B) 2-Phenyl ethylamine
(C) N-Methyl benzyl amine
(D) Aniline
Choose the correct answer from the options given below:

Select the correct sequence for transport of sperm in the male reproductive
system.
(A) Urethra
(B) Urethra meatus
(C) Ejaculatory duct
(D) Vas deferens
Choose the correct answer from the options given below:

Match List-I with List-I

List-I	List-II
A. Electric field outside a uniformly charged thin spherical shell	(I) zero
B. Electric field inside a uniformly charged thin spherical shell	(II) \(\frac{\lambda}{2 \pi \epsilon_0 r} \vec{n}\)
C. Electric field due to an infinitely long straight uniformly charged wire	(III) \(\frac{\sigma}{2 \epsilon_0} \vec{n}\)
D. Electric field due to a uniformly charged infinite plane sheet	(IV) \(\frac{k q}{r^2} \vec{r}\)

Choose the correct answer from the options given below:

Corner points of the feasible region for LPP are: \((4,0),(0,5),(7,0),(5,2)\) and \((0,3)\). Let \(Z=3 x+6 y\) be the objective function. Then, the value of (Max. \(Z-\) Min. \(Z\) ) i :

If we double the number of turns in a moving coil galvanometer, the voltage sensitivity of the galvanometer

Reaction occurring at cathode is
\(HgO+H_2 O+2 e^{-} \rightarrow Hg+2 OH^{-}\)
Above reaction is found in :

Which of the following microbe lives in symbiotic association in roots nodules of leguminous plants?