Friday 5 April 2013

Which of the following materials fall in the category of a “pure substance”?

Question 7. Which of the following materials fall in the category of a “pure substance”?
(a) Ice
(b) Milk
(c) Iron
(d) Hydrochloric acid
(e) Calcium oxide
(f) Mercury
(g) Brick
(h) Wood
(i) Air.
Answer: 
Out of the above substances only Ice, Iron, Hydrochloric acid, Calcium oxide and Mercury are pure substance.

10 comments:

  1. Bcz brick made up of water nd mud ..air is also a homogenous mixture(oxygen,nitrogen etc)
    Wood vary frm tree to tree ..it is made up of differnt compunds...
    Things that can made up more than one substance is called impure

    ReplyDelete
  2. THn how is hydrochloric acid and calcium oxide a pure substance....Hydrochloric acid is mixture of hydrogwn and oxygen.....cakcium oxide is mixture of calcium and oxygen.....i want the answer

    ReplyDelete
    Replies
    1. Hcl and o2 are mixed in the same ratio so it is called a mixture

      Delete
  3. A compund is also a pure substance as it have a definite composition

    ReplyDelete
  4. 🤔🤔🤔🤔🙄😌😀😀

    ReplyDelete