NEET Previous Years Solutions

In one molal solution that contains 0.5 mole of a solute, there is

 (1) 500 g of solvent

(2) 100 mL of solvent

(3) 1000 g of solvent

(4) 500 mL of solvent

Q. A cylinder contains hydrogen gas at pressure of 249 kPa and temperature 27°C. Its density is: (R = 8.3 J mol^–1 K^–1)

    (1) 0.1 kg/m³              (2) 0.02 kg/m³                    (3) 0.5 kg/m³                  (4) 0.2 kg/m³

Q. A spherical conductor of radius 10 cm has a charge of 3.2 × 10^-7 C distributed uniformly. What is the magnitude of electric field at a point 15 cm from the centre of the sphere?

$\mathbf{ }\left(\frac{1}{4{\mathrm{\pi \epsilon }}_0} = 9 \times {10}^9 {\mathrm{Nm}}^2 / C^2\right)$

(1) 1.28 × 10⁷ N/C 

(2) 1.28 × 10⁴ N/C 

(3) 1.28 × 10⁶ N/C 

(4) 1.28 × 10⁵ N/C

Q. What is the IUPAC name of the organic compound formed in the following chemical reaction?

 (1) 2-methyl propan-2-ol                               (2) pentan-2-ol

 (3) pentan-3-ol                                               (4) 2-methyl butan-2-ol

Q. Reaction between benzaldehyde and acetophenone in presence of dilute NaOH is known as:

    (1) Cross Cannizzaro’s reaction                  (2) Cross Aldol condensation

    (3) Aldol condensation                                  (4) Cannizzaro’s reaction

Q. A tertiary butyl carbocation is more stable than a secondary butyl carbocation because of which of the following?

   (1) –R effect of –CH₃ groups                        (2) Hyperconjugation

   (3) –I effect of –CH₃ groups                          (4) + R effect of –CH₃ groups