Daily NEET MCQ- July 11, 2022 - NEET MCQ

1 mole of sulfur, S₈ requires 48 moles of concentrated nitric acid. The reaction is given by S₈ + 48HNO₃ → 8H₂SO₄ + 48NO₂ + 16H₂O. 10, 4 and 20 moles of concentrated nitric acid is required to produce iodic acid, carbon dioxide and phosphoric acid from 1 mole of iodine, carbon and phosphorus, respectively.

Pickling of stainless steel is the process of removal of a thin layer of the alloyed metal from the surface. The common reagent used is nitric acid along with calculated amounts of hydrofluoric acid.

Aluminum does not dissolve in nitric acid. This is because treatment with nitric acid results in the formation of a tough oxide layer. This oxide layer prevents it from further reacting with the oxide. Hence, the compound formed is Al₂O₃ i.e. aluminum (III) oxide.

Torque acting on a dipole is p*E*sinθ where E is the electric field. Now θ is 0 degree, so sinθ becomes 0 and hence no torque acts on the dipole. So in this case, no force or torque acts on the dipole. Therefore it will be the condition of stable equilibrium. In the case of θ=180 degree, sinθ is also 0 but the condition is known as unstable equilibrium i.e. if we rotate the dipole a bit, it will not come back to its initial position.

In the case of a non-uniform electric field, the force acting on both the charges of the dipole will be unequal. So, there will be a net force acting on the dipole in a certain direction. Also, there will be a torque due to two forces acting at two different points. But in case of a uniform electric field, the net force on the dipole will be zero but net torque will be non-zero.

Dipole is the combination of two equal but opposite charges, kept at a certain distance. If it is placed in a uniform electric field, both the charges will suffer the same but opposite forces on them. As a result, the net force on the dipole becomes zero, but due to equal and opposite forces acting on two different points, there is a net torque acting on the dipole.

Flowers are the reproductive units of angiosperms. Angiosperms are flowering plants. Its inside the flowers that the male and female reproductive structures exist. Stamens in case of males and pistil in case of females.

The four whorls of the flower are arranged successively on a swollen end of a stalk or pedicel known as the thalamus or the receptacle. The receptacle gives rise to edible parts of the fruit.

Flowers are unique in color, shape, odor, etc. for pollination. It is necessary to attract insects and animals for cross pollination and having sweet odor and attractive shapes and colors helps in attracting them. Pollination is a pre-requisite for fertilization.

Androecium collectively consists of the stamens, that is anthers and filaments. Anthers consists of the pollen grains. It’s within the pollen grains that the microspores are present. They form the male gamete.