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  • 1(current)
Q. No.

The pair that on reaction will not evolve H2 gas is  

1.  Copper and HCl (aqueous)
2.  Iron and steam
3.  Iron and H2SO4 (aqueous)
4.  Sodium and ethyl alcohol

Q1:
 55% From NCERT AIPMT - 1998
Subtopic:  Preparation & Properties |
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 H2O2 on oxidation gives:

1. O-2

2. OH-

3. O2-

4. O2

Q2:
 58% From NCERT AIPMT - 1999
Subtopic:  H2O2 (Hydrogen Peroxide) |
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Pure water can be obtained from sea water by:

1.  Centrifugation
2.  Plasmolysis
3.  Reverse osmosis
4.  Sedimentation

Q3:
 77% From NCERT AIPMT - 2001
Subtopic:  Water |
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