help in simple chemistry question

• amusing_dick

  13 Aug 07, 02:49

  
  answer given is D
  this one hor..so amphoteric oxide don't react with alkali?? enlighten me.
  
  
  Q:Which of the following oxides reacts with an acid to form a salt but does not reacts with an alkali?
  Ans:A
  can teach how to do this??
  
  
• ^tamago^

  13 Aug 07, 02:58

  indeed Q59 is weird.
  
  
• amusing_dick

  13 Aug 07, 03:06

  copper,zinc oxide cannot mah?? y?
• ^tamago^

  13 Aug 07, 03:15

  Originally posted by amusing_dick:

  copper,zinc oxide cannot mah?? y?

  usually metal and metalloid oxides/hydroxides are amphoteric, but not non-metallic oxides/hydroxides. so i will choose C.
• viopurp

  13 Aug 07, 03:23

  think for question 83, the answer is wrong.
  if you are doing the ten year series or five year series, some of the answers in their answer keys are wrong.
  my teacher used to go through the answers with us and we found out that some of their answers can be wrong.
  yea, so best is to go and clarify with ya teacher.
• ^tamago^

  13 Aug 07, 03:26

  Originally posted by viopurp:

  think for question 83, the answer is wrong.

  yeah. i also think it is C.
• viopurp

  13 Aug 07, 03:41

  hm.
  for question 59, can you show the whole question and all the choices clearly?
  the question appear to be cut-off.
  
  but anyway, for your information,
  the amphoteric oxides that you need to know for secondary level are just:
  - aluminum oxide
  - zinc oxide
  - lead (II) oxide
• Darkness_hacker99

  13 Aug 07, 11:29

  For Q83, the answer is C. Amphoteric oxide can react with both acid and alkalis.
  
  For Q59, my answer will be C.
  
  First, I'll eliminate the acidic oxide which is the carbon dioxide.
  
  Then, I'll eliminate the amphoteric oxides which are the Aluminium oxide and Zinc oxide. As you know, amphoteric oxides can react with both acids and alkalines.
  
  The remain answer left is C, Copper(II) oxide.
• wonderamazement

  13 Aug 07, 21:09

  Originally posted by amusing_dick:

  Q:Which of the following oxides reacts with an acid to form a salt but does not reacts with an alkali?
  Ans:A
  can teach how to do this??

  ZAL metals...
• amusing_dick

  14 Aug 07, 02:12

  Originally posted by wonderamazement:

  ZAL metals...

  there are two amphoteric
  aluminum and zinc,so which 1 to choose?
• amusing_dick

  14 Aug 07, 02:13

  Originally posted by Darkness_hacker99:

  For Q83, the answer is C. Amphoteric oxide can react with both acid and alkalis.
  
  For Q59, my answer will be C.
  
  First, I'll eliminate the acidic oxide which is the carbon dioxide.
  
  Then, I'll eliminate the amphoteric oxides which are the Aluminium oxide and Zinc oxide. As you know, amphoteric oxides can react with both acids and alkalines.
  
  The remain answer left is C, Copper(II) oxide.

  ok nice 1.
• ^tamago^

  14 Aug 07, 07:14

  Originally posted by amusing_dick:

  ok nice 1.

  pls clarify with us when ur teacher has clarified with u. thanks.