NEET (UG) entrance exam Question Bank Solutions

Standard enthalpy of combustion at 25°C of hydrogen, cyclohexene (C₆H₁₀) and cyclohexane (C₆H₁₂) are – 240, – 3800 and – 3920 kJ/mol respectively. The heat of hydrogenation of cyclohexene is ______.

\[\ce{H2O2}\] is always stored in black bottles because ______. 

In laboratory, \[\ce{SiCl4}\] can be prepared by ______. 

Two elements X and Y combine in the gaseous states to form XY in the ratio of 1 : 35.5 by mass. The mass of Y that will be required to react with 2 g of X is ______.

Vapour pressure of a solution of a non-volatile solute is always ______

Which of the following increases with the increase in the concentration of the solution?

Which of the following is the wrong statement?

The substances which do NOT act as catalysts but increase the activity of the catalyst are called ______

Which of the possible molecule/species is having maximum values for dipole moment. (where "A" is the central atom)?

For a system to be in equilibrium, ΔG = 0 under conditions of constant.

Alkynes exhibit:

In Duma's method for estimation of nitrogen 0.3 g of an organic compound gave 50 mL of nitrogen collected at 300 K temperature and 715 mm pressure. Calculate the % composition of nitrogen in the compound: (Aqueous tension at 300 k = 15 mm)

What is the oxidation number of Fe in Fe(CO)₅?

Freon used as refrigerant is ______.

Peptide linkage is:

The molar conductance of NaCl, HCl and CH₃COONa at infinite dilution are 126.45, 426.16 and 91.0 S cm² mol⁻¹ respectively. The molar conductance of CH₃COOH at infinite dilution is ______.

Choose the right option for your answer.

The molar conductivity of 0.007 M acetic acid is 20 S cm² mol⁻¹. What is the dissociation constant of acetic acid? Choose the correct option.

\[\begin{array}{cc}
\end{array}\]\[\begin{bmatrix}
\ce{\Lambda^{\circ}_{H^+} = 350 S cm^2 mol^{-1}}\\
\ce{\Lambda^{\circ}_{CH_3COO^-} = 50 S cm^2 mol^{-1}}
\end{bmatrix}\]

The major product of the following chemical reaction is:

\[\begin{array}{cc}
\ce{CH3}\phantom{.................................}\\
\backslash\phantom{...........................}\\
\phantom{............}\ce{CH - CH = CH2 + HBr ->[(C6H5CO)2O2]?}\\
/\phantom{...........................}\\
\ce{CH3}\phantom{.................................}\\
\end{array}\]

The molar conductance of NaCl, HCl, and CH₃COONa at infinite dilution are 126.45, 426.16, and 91.0 S cm² mol⁻¹ respectively. The molar conductance of CH₃COOH at infinite dilution is. Choose the right option for your answer.

Which of the following reactions is NOT correct according to the law of conservation of mass?