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What are amphoteric substances? Give exa...

What are amphoteric substances? Give examples.

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A substance or molecule which acts both as acid as well as base, is called amphoteric.
Examples:
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SUBHASH PUBLICATION-CHEMICAL EQUILIBRIUM-TWO MARK QUESTIONS AND ANSWERS :
  1. Define Arrhenius acid-base theory with one example.

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  2. Define Bronsted Lowry theorey or Protonic theory with one example.

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  3. What are amphoteric substances? Give examples.

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  4. What are conjugate acid-base pairs? Give one example.

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  5. Explain Lewis electron acid - base concept with an example.

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  6. Explain with an example equilibrium involving dissolution of solids in...

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  7. Mention any three applications of equilibrium constant.

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  8. Explain Homogeneous equilibria.

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  9. Explain Heterogeneous equilibria.

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  10. Give one example for the relation between K(p)andK(c) for a reaction, ...

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  11. Predict the spontaneity of a forward (or) a reverse reaction based on ...

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  12. Explain factors affecting equilibria.

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  13. Explain briefly the effect of temperature on Le-Chatelier's principle.

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  14. Briefly explain the effect of pressure on Le-Chatelier's principle.

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  15. Write a note on the effect of concentration on Le-Chatelier's principl...

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  16. Briefly explain the effect of addition of inert gas on Le-Chatelier's ...

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  17. All Bronsted bases are also lewis bases, but all bronsted acids are no...

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  18. Exaplain ionisation of acids and bases.

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  19. Explain degree of dissociation.

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  20. Prove that pH+pOH=pK(w) at 298 K.

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