Blue vitriol is copper sulphate.

Molecular mass of CuSO₄ = 160 g

160 g of CuSO₄ contains 63 gCu

So, 100 g of CuSO₄ contains = (100×63) / 160

= 39.37 g

Hence, the correct option is (C).

Aniline was selectively converted into the corresponding nitrosobenzene and nitrobenzene by oxidation with 30% aqueous hydrogen peroxide. The reaction was catalyzed by various heteropolyoxometalates, at room temperature, in dichloromethane under two-phase conditions. In second step hydrogen peroxide is reacted as shown in following reaction image:

Hence, the correct option is (A).

The flora of a particular area consists of its plant species, considered as a whole. An aggregate of all the species living in a particular ecosystem is called an ecological community. So, all the plants and animals species living in a particular area form the community of that area.

The plants found in a particular area are termed as flora area. The animals found in a particular area are tamed as fauna of that area. Endemic Species: Those species of plants arid animals which are found exclusively in a particular area are called endemic species to a zone, a state or a country.

Hence, the correct option is (B).

The cat is a small carnivorous mammal.

It is the only domesticated species in the family Felidae. It's Binomial name is Felis catus.

Scientific classification:-

Kingdom → Animalia

Phylum →Chordata

Family → Felidal

Class → Mammalia

Species →F.catus

Order → carnivores

Suborder → Feliformia

Subfamily → Felinae

Hence, the correct option is (C).

The train is accelerated. This is why the ball hanging from the roof of the train inclines towards the rear of the train. The behaviour of the ball is explained by the law of inertia.

The ball tries to be at rest when the train together with the rope is moving forward.

Hence, the correct option is (A).

Cow is administered hormone having LH like activity for super ovulation is not a step in Multiple Ovulation Embryo Transfer Technology (MOET).

Multiple Ovulation Embryo Transfer Technology is used for herd improvement in short time. 

• Cows are administered hormones, with FSH-like activity for superovulation. 
• 8-32 celled embryos are transferred to surrogate mothers. 
• 6-8 eggs are produced per cycle. 
• Cows can be fertilised by artificial insemination.

Hence, the correct option is (B).

The hydrogen bonding which takes place within a molecule itself is called intramolecular hydrogen bonding. It takes place in compounds containing two groups such that one group contains a hydrogen atom linked to an electronegative atom and the other group contains a highly electronegative atom linked to a lesser electronegative atom of the other group.

The bond is formed between the hydrogen atoms of one group with the more electronegative atom of the other group.

o-Nitrophenol shows intramolecular hydrogen bonding.

Hence, the correct option is (B).