JEE Main entrance exam Question Bank Solutions

The Non-proteinous substances which certain enzymes required for their activity are called ______.

Dinitrogen is a robust compound, but reacts at high altitudes to form oxides. The oxide of nitrogen that can damage plant leaves and retard photosynthesis is ______.

The magnetic moment of central atom of [Co(NH₃)₆]³⁺ is ______.

The orbital having two radial as well as two angular nodes is ______.

Spin only magnetic moment in BM of \[\ce{[Fe(CO)4(C2O4)]+}\] is ______.

Identify the incorrect statement for PCl₅ from the following.

Which one of the following reactions will not form acetaldehyde?

In which of the following reactions, an increase in the volume of the container will favour the formation of products?

The number of sigma bonds in

\[\begin{array}{cc}
\phantom{}\ce{H3C - C = CH - C ≡ C - H}\\
|\phantom{.............}\\
\ce{H}\phantom{.............}
\end{array}\]

Which one of the following reactions indicated the reducing ability of hydrogen peroxide in basic medium?

Geraniol, a volatile organic compound, is a component of rose oil. The density of the vapour is 0.46 g L^–1 at 257°C and 100 mm Hg. The molar mass of geraniol is ______ g mol^–1. (Nearest Integer)

[Given: R = 0.082 L atm K^–1 mol^–1]

When 9.45 g of ClCH₂COOH is added to 500 mL of water, its freezing point drops by 0.5°C. The dissociation constant of ClCH₂COOH is x × 10⁻³. The value of x is ______. (Rounded-off to the nearest integer)

[\[\ce{K_{f(H_2O)}}\] = 1.86 K kg mol⁻¹]

An element belonging to 3d series of modern periodic table has spin magnetic moment = 5.92 B.M. in +3 oxidation state. The atomic number of elements are ______.

A storage battery contains a solution of H₂SO₄ 38% by weight. At this concentration, Van't Hoff Factor is 2.50. At the battery content freeze temperature will be ______ K.

(K_f = 1.86 K Kg mol⁻¹)

The product of reaction between 1,1,2,2-tetrachloro propane and Zn dust/Δ ______.

The degree of dissociation of Ca(NO₃)₂ in a dilute aqueous solution containing 7 g of the salt per 100 g of water at 100°C is 70%. If the vapour pressure of water at 100°C is 760 mm. The vapour pressure of the solution is ______ mm.

The sum of the number of σ-bonds to π-bonds in C₂(CN)₄ molecule is ______.

Consider the reaction

\[\begin{bmatrix}\begin{array}{cc}
\phantom{.......}\ce{CH3}\\
\phantom{....}|\\
\ce{CH3CH2CH2 - \overset{⊕}{N} - CH2CH3}\\
\phantom{....}|\\
\phantom{.......}\ce{CH3}
\end{array}\end{bmatrix}\]\[\ce{OH^- ->[Heat] ?}\]

Which of the following is formed in a major amount?

10 ml of H₂O₂ solution when reacted with KI solution produced 0.5 g of iodine. The percentage of purity of H₂O₂ (by volume) is ______%.

A molecule M associates in a given solvent according to the equation \[\ce{M <=> (M)_n}\]. For a certain concentration of M, the van't Hoff factor was found to be 0.9 and the fraction of associated molecules was 0.2. The value of n is ______.