UPSC EPFO 2023: 11h June

Electron is a universal constituent of matter. This fact was supported by various experiments (in which similar production of electrons occurred). Which of the following experiments did not support this fact?

Aspirin is prepared by the esterification of the phenolic hydroxyl group of salicylic acid. The molecular formula is given as C₉H₈O₄. What is the molecular mass (u) for this compound?

(Average atomic mass of C= 12.01 u, H=1.008 u ,O= 16.00 u)

To an unknown solution, a silver coin was dipped. After some time it was found that the silver coin turned black. The solution can be identified as ____.

Which of the following prevents the mixing of the blood of the foetus with that of the mother?

Endomembrane system consists of

i. Endoplasmic reticulum

ii. Golgi complex

iii. Lysosomes

iv. Vesicles

v. Peroxisomes