Daily NEET MCQ- May 4, 2022 - NEET MCQ

22.4L of a gas at STP has a weight equal to its molar mass.
So, the weight of CO₂ will be 12+16+16
= 44g.

Ideal gas is based on the assumptions of kinetic theory of gases(KTG). At low pressure and high temperature the intermolecular forces become less significant and the size of molecules becomes less as compared to separation between them. These are two postulates of KTG and hence in these conditions real gas behavior is similar to that of ideal gases.

The ratio of moles is the same as the ratio of partial pressures.
The ratio of densities:
d₁/d₂= (m₁/V)/(m₂/V)
= m₁/m₂= (n₁M₁)/(n₁M₂),
where n is the number of moles and M is the molecular mass. d₁/d₂= (2/3)*(16/14)
= 16/21.

The combustion reaction of alkanes has a standard reaction that is C_nH_2n+2 + (3n/2 + 1/2)O₂ → nCO₂ + (n + 1)H₂O. In the case of combustion of ethane, n = 2. That means the number of moles of oxygen required is 3(2)/2 + 1/2 = 3.5

Chlorination, bromination and iodination are the processes of halogenation of alkanes. Mechanism of halogenation of alkanes is free radical in nature that is the attacking reagent is a halogen-free radical, therefore it is a chain reaction.

Corey-House synthesis is one of the methods of preparation of alkanes and this method can be used to prepare alkanes having an odd number of carbon atoms. As 6, 2, and 4 are even numbers only the compound with three carbon atoms can be prepared.

Juxta-medullary nephrons constitute about 15-20% of the total nephrons. These nephrons have long Henle’s loop. Vasa recta are present. These nephrons work in stressful conditions.

Renal vein carries the blood with a minimum amount of urea while hepatic vein carries the blood having a maximum amount of urea.

A minute vessel of peritubular capillaries run parallel to the Henle’s loop forming a U shaped vasa recta. Vasa recta are absent or highly reduced in cortical nephrons.

In some of the nephrons in the kidney, the loop of Henle is very long and runs deep into the medulla. These nephrons dipping into the medullary region are known as juxtamedullary nephrons.