Which of the following acids is a vitamin?

Dinitrogen and dioxygen. the main constituents of air do not react with each other in atmosphere to form oxides of nitrogen because

Consider the following reaction occurring in the blast furnace:
\(\mathrm{Fe}_3 \mathrm{O}_{4(\mathrm{~s})}+4 \mathrm{CO}_{(\mathrm{g})} \rightarrow 3 \mathrm{Fe}_{(\mathrm{l})}+4 \mathrm{CO}_{2(\mathrm{~g})}\)
' \(x\) ' kg of iron is produced when \(2.32 \times 10^3 \mathrm{~kg} \mathrm{Fe}_3 \mathrm{O}_4\) and \(2.8 \times 10^2 \mathrm{~kg} \mathrm{CO}\) are brought together in the furnace. The value of ' \(x\) ' is _____. (nearest integer)
Given:
molar mass of \(\mathrm{Fe}_3 \mathrm{O}_4=232 \mathrm{~g} \mathrm{~mol}^{-1}\)
molar mass of \(\mathrm{CO}=28 \mathrm{~g} \mathrm{~mol}^{-1}\)
molar mass of \(\left.\mathrm{Fe}=56 \mathrm{~g} \mathrm{~mol}^{-1}\right\}\)

Element \("E"\) belongs to the period \(4\) and group \(16\) of the periodic table. The valence shell electron configuration of the element, which is just above \('E'\) in the group is \(.....\)

Given below are two statements :
Statement I : \(\mathrm{CrO}_3\) is a stronger oxidizing agent than \(\mathrm{MoO}_3\)
Statement II : \(\mathrm{Cr}(\mathrm{VI})\) is more stable than \(\mathrm{Mo}(\mathrm{VI})\)
In the light of the above statements, choose the correct answer from the options given below

Lowest Oxidation number of an atom in a compound \(\mathrm{A}_2 \mathrm{~B}\) is -\(2\) . The number of an electron in its valence shell is _______.

The first transition series metal ' M ' has the highest enthalpy of atomisation in its series. One of its aquated ion \(\left(\mathrm{M}^{\mathrm{n} \dagger}\right)\) exists in green colour. The nature of the oxide formed by the above \(\mathrm{M}^{\mathrm{n}-}\) ion is _______.

The number of real solutions of the equation \(e ^{4 x }+4 e ^{3 x }-58 e ^{2 x }+4 e ^{ x }+1=0\) is..........

A first row transition metal in its \(+2\) oxidation state has a spin-only magnetic moment value of \(3.86 \mathrm{BM}\). The atomic number of the metal is _______.

A ray of light is incident at an angle of \(60^o\) on one face of a prism of angle \(30^o\) . The emergent ray of light makes an angle of \(30^o\)  with incident ray. The angle made by the emergent ray with second face of prism will be....\(^o\)

The largest natural number \(n\) such that \(3^{ n }\) divides \(66 !\) is \(............\).

Let a rectangle \(A B C D\) of sides \(2\) and \(4\) be inscribed in another rectangle \(P Q R S\) such that the vertices of the rectangle \(A B C D\) lie on the sides of the rectangle \(P Q R S\). Let \(a\) and \(b\) be the sides of the rectangle \(P Q R S\) when its area is maximum. Then \((a+b)^2\) is equal to :

If a line, \(y=m x+c\) is a tangent to the circle, \((x-3)^{2}+y^{2}=1\) and it is perpendicular to a line \(\mathrm{L}_{1},\) where \(\mathrm{L}_{1}\) is the tangent to the circle, \(\mathrm{x}^{2}+\mathrm{y}^{2}=1\) at the point \(\left(\frac{1}{\sqrt{2}}, \frac{1}{\sqrt{2}}\right),\) then