Thursday 14 March 2013

A solution of a substance ‘X’ is used for white washing. (i) Name the substance ‘X’ and write its formula. (ii) Write the reaction of the substance ‘X’ named in (i) above with water.


1. A solution of a substance ‘X’ is used for white washing.
(i) Name the substance ‘X’ and write its formula.
(ii) Write the reaction of the substance ‘X’ named in (i) above with water.
Answer:
(i)The substance ‘X’ which is used in white washing is calcium oxide or quick lime and its formula is CaO.
(i)The reaction involved is

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52 comments:

  1. Unknown8 April 2014 at 06:24

    please tell the reaction of CaO with water used for whitewashing

    ReplyDelete
    Replies
    1. Unknown17 June 2016 at 04:37

      The above given reaction is used in white washing

      Delete
    2. Unknown17 June 2016 at 04:38

      The above given reaction is used in white washing

      Delete
    3. Unknown10 May 2017 at 20:52

      CaO+H2O->Ca(OH)2 this is the reaction of CaP with water

      Delete
    4. Manjot Singh kohli9 March 2018 at 08:20

      When CaO+H2O-Ca(OH)2 is the reaction evolved when Cao is put into water

      Delete
    5. Unknown24 January 2019 at 06:53

      Taat e hatti

      Delete
    6. Unknown10 February 2019 at 00:16

      When Calcium oxide or quick lime is reacted with water .Eq is as follows:
      CaO+H2O gives Ca(OH)2 + heat

      Delete
    7. Unknown15 February 2019 at 03:34

      Cao+H2o=Ca(OH)2+heat is produced
      And this is a chemical reaction characterised by change in temperature.

      Delete
    8. Unknown17 February 2019 at 01:28

      Cao+H2o =Ca (OH)2 + heat

      Delete
    9. Unknown11 March 2019 at 01:12

      Ca(OH)2 i.e,slaked lime is used for white washing.

      Delete
    10. Unknown22 March 2019 at 11:30

      Are bhai H2O water he hai

      Delete
    11. Unknown15 May 2019 at 07:02

      Combination reaction bro

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    12. Unknown13 September 2019 at 21:13

      Ca(OH)2

      Delete
  2. Unknown19 September 2015 at 23:34

    Cao Reacts with Water to Form Calcium Hydroxide Ca(OH)2

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  3. Unknown19 September 2015 at 23:34

    Cao Reacts with Water to Form Calcium Hydroxide Ca(OH)2

    ReplyDelete
  4. Unknown1 June 2016 at 09:27

    Yes Vilakshan, u r right

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  5. Unknown8 July 2016 at 10:29

    Page 7 of ncert class 10 science says caoh2 is used.

    ReplyDelete
    Replies
    1. Unknown10 February 2019 at 00:17

      You are saying the right .Same sentence is in the text book in a column

      Delete
  6. Unknown8 July 2016 at 10:29

    Page 7 of ncert class 10 science says caoh2 is used.

    ReplyDelete
  7. ShreyT25 July 2016 at 02:57

    Exactly hiten I had my exam today I wrote ca(oh)2 will I lose marks

    ReplyDelete
  8. Unknown27 July 2016 at 00:24

    How can it be Cao it is clearly given in the ncert textbook that it is calcium hydroxide

    ReplyDelete
  9. Suraj23 December 2016 at 05:29

    It is given in the textbook that the solution of calcium hydroxide is use for white washing. So how it can be true that the solution of calcium oxide is use for white washing??

    ReplyDelete
  10. Unknown22 March 2017 at 04:51

    Study properly useless fellows

    ReplyDelete
  11. ckrajesh69@gmail.com7 June 2017 at 10:22

    So wat is te ansssss
    😮

    ReplyDelete
    Replies
    1. hi5 August 2017 at 09:25

      CaO reacts with water to form Ca(OH)2 which is limewater. we apply it on walls and it reacts with atmospheric CO2 to give CaCO3 and water. the water evaporates leaving behind the calcium carbonate which is white in colour and whitewashes the walls.

      Delete
  12. Unknown7 August 2017 at 09:06

    Please let me know why kattappa killed bahubali

    ReplyDelete
    Replies
    1. Unknown6 September 2017 at 09:02

      See the movie ..Get to know your answer... Bahubali 2😑😑😑

      Delete
    2. your rival15 May 2018 at 19:32

      I had seen it but doesn't get the answer

      Delete
  13. unknown31 August 2017 at 13:55

    Ca(oh)2 is slaked lime. Lime water is Ca(OH)2.H2O

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  14. Unknown6 December 2017 at 11:09

    When cao dissolved in water it become cao + h20 ---> ca(oh)2. Then this ca(oh)2 is applied on wall then it react with co2 in air to form caco3.
    Ca(oh)2 + co2 ---> caco3.

    ReplyDelete
  15. Unknown6 March 2018 at 03:43

    Can someone please tell the answer of above. Because of no. 7 of ncert says that a solution
    slaked line is used for white washing walls

    ReplyDelete
  16. Unknown6 March 2018 at 03:44

    Can someone please tell the answer of above. Because of no. 7 of ncert says that a solution
    slaked line is used for white washing walls

    ReplyDelete
  17. iit(an)30 April 2018 at 16:21

    U fellows, in ncert it is given that slaked lime is used for white washing...

    ReplyDelete
  18. Unknown27 June 2018 at 07:09

    Yes it is used in white washing.
    It's right.

    ReplyDelete
  19. Unknown2 December 2018 at 09:54

    You are right my friend . Its CaO which is used for white washing

    ReplyDelete
  20. Unknown24 January 2019 at 21:19

    Thanks for the answer

    ReplyDelete
  21. Unknown27 January 2019 at 06:08

    Thanks for answers

    ReplyDelete
  22. Unknown13 February 2019 at 20:38

    Ain't ca(oh)2 used for white washing ??!!!!!

    ReplyDelete
  23. Unknown9 March 2019 at 02:18

    How calcium carbonate is formed

    ReplyDelete
  24. Unknown10 April 2019 at 10:42

    Thanks

    ReplyDelete
  25. Vishal Kumar16 April 2019 at 04:00

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    ReplyDelete
  26. Unknown4 May 2019 at 07:05

    Thanks

    ReplyDelete

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