JEE Main 2021 Question Paper (25-Jul-2021) (Shift 1)

Question 1

is a repeating unit for :

Accepted Answer

Novolac

Answer

Buna-N

Answer

Acrilan

Answer

Neoprene

Question 2

Which one of the following species responds to an external magnetic field?

Accepted Answer

$\left[\mathrm{Fe}\left(\mathrm{H}_2\mathrm{O}\right)_6\right]^{3+}$

Answer

$\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}$

Answer

$\left[\mathrm{Co}(\mathrm{CN})_6\right]^{3-}$

Answer

$\left[\mathrm{Ni}(\mathrm{CO})_{4}\right]$

Question 3

Consider the above reaction, the major product $ \mathrm{P} $ is:

Accepted Answer

""

Answer

Answer

Answer

Question 4

Sodium stearate $\mathrm{CH}_3(\mathrm{CH}_2)_{16}\mathrm{COO}^- \mathrm{Na}^+$ is an anionic surfactant which forms micelles in oil. Choose the correct statement for it from the following:

Accepted Answer

It forms spherical micelles with $\mathrm{CH}_3\mathrm{(CH}_2)_{16}-$ group pointing towards the centre of the sphere.

Answer

It forms non-spherical micelles with $-{\mathrm{COO}}^{-}$ group pointing outwards on the surface.

Answer

It forms spherical micelles with the $\mathrm{CH}_3(\mathrm{CH}_2)_{16}-$ group pointing outwards on the surface of the sphere.

Answer

It forms non-spherical micelles with $\mathrm{CH}_3(\mathrm{CH}_2)_{16}$-group pointing towards the centre.

Question 5

The water soluble protein is:

Accepted Answer

Albumin

Answer

Fibrin

Answer

Myosin

Answer

Collagen