Question

Assertion (A) ： Pure substances in which molecules are made up of only one kind of atoms are known as elements.
Reason (R)： Hydrogen, oxygen and nitrogen are elements.（ ）

A.Both A and R are true and R is the correct explanation of A.

B.Both A and R are true but R is not the correct explanation of A.

C.A is true but R is false.

D.A is false but R is true.​

Answer 1

Answer:

Option (a) is the correct answer

Both A and R are true and R us correct explanation of A

Explanation:

Reason :-

Because elements are that which made up of single type of atom .

Examples of elements are Iron, oxygen

Hydrogen and gold

So option (a) is correct answer

Answer 2

Answer:

B

Explanation:

it is true that pure substances in which molecules are made up of only one kind of atoms are known as elements.

and

also, hydrogen, oxygen and nitrogen are elements

But example is not reason to it ...

Hope it helps u