Daily NEET MCQ- March 22, 2022 - NEET MCQ

Fertile human couple successfully produces offspring but mules, worker bees and an infertile human couple are incapable of reproduction.

Reproduction is the only criteria by which living and non-living organisms can be differentiated without any exception. Growth is seen in non-living organisms as well. Metabolism can be carried out in-vitro. Consciousness is also present in patients in coma.

Since the second component which refers to the genus is same in both the binomial nomenclatures. The word phylum is used particularly for animal kingdom.

Light year is a unit of measurement of distance. Tropical year is the amount of time sun takes to return to the same position in the season cycle.

Decibel is the unit of sound intensity. Hertz is the unit for measuring sound frequency. Hertz is the inverse of second.

Thousand milliseconds make one second. 60 seconds make one minute. And 600 minutes make one hour.

Though the other substances are excess in amount than the required, each and every reactant needs to be in a fixed ratio to attain the desired product. So, thereby, the reactant that limits the quantity of the product formed is called limiting reagent and this reactant gets consumed first completely.

4Al + 3O₂ → 2Al₂O₃ is a balanced reaction because the number of atoms of different elements on both sides is equal. The correctly balanced equations of the rest are 2H₂ + O₂ → 2H₂O; Mg(OH)₂ + 2HNO₃ → Mg(NO₃)₂ + 2H₂O and N₂ + 3H₂ → 2NH₃.

The chemical equation of water formation is 2H₂ + O₂ → 2H₂O. Though we have 8g of hydrogen, here oxygen is the limiting reagent. So the only 4g of hydrogen can be used to produce water i.e. 36g of water. That is 2 moles.

Molality of a solution is given y the formula; molality = number of moles of the solute/mass of the solution. So here the number of moles is 8 and the mass of the solution is 4 kg. Molality is 8/4 = 0.5 mol/kg.