Daily NEET MCQ- April 19, 2022 - NEET MCQ

Low melting point of gallium is due to the fact that it consists of Ga2 molecules and gallium remains liquid up to 2276 k. Hence it is used in high-temperature thermometer. Gallium as a chemical symbol that is Ga and its atomic number is given as 31.

On moving down the group, ionization enthalpy decreases from Boron to aluminium, but the next element gallium has slightly higher ionization enthalpy than aluminium due to the poor shielding of intervening d-electrons, it again increases in indium and then decreases in the last element thallium.

Inert pair effect is the reluctance of the selections of the valence shell to take part in bonding, it occurs due to pore shielding of ns2 electrons by intervening d-electrons and f-electrons, down the group, it increases. The below elements of the group exhibit lower oxidation States.

RBCs are anucleate because this allows them contain more oxygen and therefore carry more oxygen. RBCs are anucleate because this allows them contain more oxygen and therefore carry more oxygen. RBCs lack mitochondria, Golgi apparatus and SER etc. Due to lack of nucleus, they don’t get involved in the protein synthesis.

Eukaryotic cell contains membrane bound nucleus whereas prokaryotic cell don’t. Both eukaryotic and prokaryotic and eukaryotic cells contain nucleus (or nucleolus) which contains genetic material in them i.e. both DNA and RNA in them.

The fluid inside the cell enclosed by plasma membrane. It is little viscous and comprises of 80% water. Cytoplasm without cell organelles is termed as Cytosol. Cytosol is not static and movement of cytoplasm is termed as cyclosis

pH, temperature, viscosity, hormones and light are the factors effecting cyclosis. Lower the viscosity more is the rate of cyclosis. Cytoplasm plays the vital role in respiration and contains dissolved nutrients. Cytoplasm controls the shape of the cell and dissolves waste product.

Endomembrane system comprises of vacuoles, endoplasmic reticulum, endosomes, nuclear membrane, vesicles, lysosomes and plasma membrane. They act as a single functional and developing unit of the cell.

Washing soda is nothing but sodium carbonate it contains two atoms of sodium, one atom of carbon, three atoms of Oxygen and 10 moles of water in one molecule its chemical formula is given by Na₂CO₃.10H₂O.

The energy of an nth orbit in a hydrogen atom is given by the formula E_n = -R_H/n², where is the energy of nth orbit and R_H is the Rydberg constant. E₅ – E₂ = -4.58 x 10^-19J. λ(wavelength) = c(speed of light)h(Planck’s constant)/E = 434nm.