Questions

The two functional groups Amine and carboxyl groups are always found in amino acids.

Mukesh Ambani, an Indian who secured 13th position in Forbes ultra rich list 2019. 

Mukesh Dhirubhai Ambani is an Indian business magnate, the chairman, managing director, and the largest shareholder of Reliance Industries Limited, a Fortune Global 500 company and India's most valuable company by its market value.

Let speed of slower train = 2x
⇒ speed of faster train = 5x
ATQ, (150 + 200)/(2x + 5x) = 15
x = 10/3
Time required=350/[50/3–20/3]= 35 seconds

An ionic bond is formed between two molecules when transfer of valency electrons take place between them. 

Potentially hazardous foods are foods that might contain food poisoning bacteria and are capable of supporting growth of these bacteria or formation of toxins to levels that are unsafe for consumers, if the foods are not stored at correct temperatures. Toxins are poisonous chemicals produced by some types of bacteria.

The food can be left at room temperature until it reaches 60 deg C because food-poisoning bacteria will not multiply at 60 deg C or above. However, do not leave food cooling at room temperature unless you are sure that the temperature of the food is still at least above 60 C.