#1.Get the key of a minimum value from the following dictionary.
dict1={'physics':82,'math':65,'history':75}
min(dict1,key=dict1.get)

'math'

#2.Write a Python program to check if value 200 exists in the following dictionary.
dict1={'a': 100, 'b': 200, 'c': 300}
if(200 in dict1.values()):
 print("200 is present in dict1")

200 is present in dict1

#3.Merge two Python dictionaries into one
dict1 = {'Ten': 10, 'Twenty': 20, 'Thirty': 30}
dict2 = {'Thirty': 30, 'Fourty': 40, 'Fifty': 50}
dict1.update(dict2)
print(dict1)

{'Ten': 10, 'Twenty': 20, 'Thirty': 30, 'Fourty': 40, 'Fifty': 50}