Q1: Regeneration of molecular seive requires it to be heated to a temperature of about __________ °C.

ANS:D - 1000-1100

Regeneration of molecular sieves typically requires heating to a temperature range of about 1000-1100°C. At these high temperatures, any adsorbed molecules within the pores of the molecular sieve are desorbed and released, effectively cleaning the sieve and preparing it for reuse. This high temperature ensures complete removal of adsorbed contaminants and moisture, restoring the sieve's adsorption capacity. However, such high temperatures may not be suitable for all types of molecular sieves, as some materials may undergo thermal degradation or structural changes at these elevated temperatures. Therefore, the specific regeneration temperature depends on the type and composition of the molecular sieve being used.