Which of the following are examples of the null set :- Set of odd natural numbers divisible by 2

Which of the following are examples of the null set :- Set of even prime numbers

Which of the following are examples of the null set :- { x : x is a natural numbers, x 7 }

Whether the following is empty (null) set? Set of all even natural numbers divisible by 5.

Which of the following is the empty set

Which of the following is an empty set?

Which of the following is an odd number?

Which of the following are examples of the null set :- { y :y is a point common to any two parallel lines}

Taking the set of natural numbers as the universal set, write down the complements of the following set: {x : x is a natural number divisible by 3 and 5}