Daily NEET MCQ- August 3, 2022 - NEET MCQ

Ethanal can be prepared by oxidation of ethene, in the presence of an ionic catalyst in an aqueous medium. This is a greener method and gives 90% of yield.

Synthetic methods should avoid using or generating substances toxic to humans and/or the environment. Hence less hazardous chemical synthesis is an important principle.

Chlorine gas was used to bleach paper. It has good oxidizing properties. Nowadays H₂O₂ with a suitable catalyst is used for bleaching purposes as it does not contaminate groundwater.

If the length of string is L, then the wavelength of the standing wave is 2L/n.
Or we can say L = nλ/2, where n corresponds to nth harmonic.
∴ L = 4λ/2
= 2λ.

For the given condition wavelength is related to length by: λ = 4L/(2n+1).
∴ For fundamental harmonic n=0, & L = (2n+1)λ/4
= (0 + 1)λ/4
= λ/4.

For a pipe open at both ends frequency ‘f’ = nv/2L, where n is speed of sound.
Given: f = 10 & n=2.
∴ 10 = 2*340/2L
∴ L = 680/20
= 34m.

The eyes are located in two sockets present in the skull known as orbits. The orbits are bony cavities in the front part of the skull in which the eye and its appendages are accommodated and protected.

The wall of the eyeball has three layers. The outermost layer is known as the sclera. The middle layer is known as the choroid and it is bluish in color. The innermost layer is known as the retina.

The eyeball is surrounded by three layers. The sclera is the outermost opaque and fibrous layer that surrounds the eye. It is made up of dense connective tissue and provides protection and form.

The eyeball is surrounded by three layers, the outermost sclera, the middle choroid and the innermost retina. The choroid is rich in blood vessels to provide nourishment to the eye and is bluish.