Daily NEET MCQ- April 6, 2022 - NEET MCQ

Capacitance without dielectric = 40 F.
Capacitance with dielectric = 80 F.
k = 80/40
So, k = 2.

When the dielectric slab is introduced between the plates, the induced surface charge on the dielectric reduces the electric field. The reduction in the electric field results in a decrease in potential difference.

For the reaction,
RNH₂ + H₂O ↔ RNH₃⁺ + OH^–, the dissociation constant is,
K_eq = ([RNH₃⁺][OH^–])/([RNH₂][H₂O])
⇒ K_eq[H₂O] = ([RNH₃⁺][OH^–])/[RNH₂]
⇒ K_b = ([RNH³⁺][OH^–])/[RNH₂]

Since amines are basic in nature, they react with acids to form salts of ammonium. Ethanamine (CH₃CH₂NH₂) reacts with HBr in a reversible reaction to form ethylammonium bromide through addition.

Methylamine and hydrogen iodide are allowed to mix at very cold temperatures for about 2 hours. The resulting product is allowed to evaporate and methanaminium iodide (CH₃NH₃I) is obtained in the form of a white powder.

Endemism is the ecological state of the species being confined to a particular region or only in one geographic region and not found anywhere else. Such species are known as endemic species. Some examples are Asiatic lion, Purple frog, Sangai deer, Sapria Himalayana, etc.

A biogeographic region with significant levels of biodiversity having a large number of endemic species that are threatened by human habitation is known as biodiversity hotspots. In all, there are 34 biodiversity hotspots present throughout the world.

The Western Ghats is the odd one from others. The Western Ghats are the biodiversity hotspots having exceptionally high biodiversity.

A biogeographic region with significant levels of biodiversity having a large number of endemic species that are threatened by human habitation is known as biodiversity hotspots. In all, there are 34 biodiversity hotspots present throughout the world covering up to 2 % of the Earth’s surface.

Biosphere reserves are the protected geographical areas where along with flora and fauna human population also forms a part of the system. In all, there are 14 biosphere reserves in India. Nanda Devi, Manas, Panchmarhi are few examples of biosphere reserves.