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.
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10 comments:

  1. Unknown26 September 2015 at 08:17

    give reasons

    ReplyDelete
  2. Parveer singh9 May 2016 at 06:52

    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
  3. Unknown30 June 2016 at 06:40

    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. Jyothi22 August 2017 at 17:47

      Hcl and o2 are mixed in the same ratio so it is called a mixture

      Delete
  4. Sance11 September 2016 at 01:51

    Thanks

    ReplyDelete
  5. Abhishek19 July 2017 at 03:14

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

    ReplyDelete
  6. Unknown6 September 2017 at 10:47

    Yes.

    ReplyDelete
  7. Unknown12 November 2021 at 06:36

    🤔🤔🤔🤔🙄😌😀😀

    ReplyDelete

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