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Observe and prepare two questions while ...

Observe and prepare two questions while doillLg the following activity in the lab. Take 2 ml of dil. NaOH in a test tube and add on1e drop of phenolphthalein indicator. Mter that add dil. HCl solution to the above sc,lution drop by drop.

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1) What is the colour of the solution before adding the HCl ?
2) Does the colour change after adding the HCl?
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VGS PUBLICATION-BRILLIANT-ACIDS, BASES AND SALTS -Section-2
  1. Suggest to your friend, the substances required to prepare sodium zinc...

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  2. X' is a substance which gives CO2 , water and. common salt on adding H...

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  3. Observe and prepare two questions while doillLg the following activity...

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  4. Predict 'X' from the given figure. If X+basetowater+NaCl

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  5. Guess the reason for that the HCl, evolved in the reaction. 2NaCl+H2S...

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  6. What happens when Mg(OH)2 is dissolved in water?

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  7. x' ions cannot exist as bare ions. They associate with water molecules...

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  8. Which one of the following is preferred to control the acidity? Why?

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  9. What is the nature of the salt CaSO4 formed by the reaction between ca...

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  10. Why do acids not show acidic behaviour in the absence of water?

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  11. Why pura acetic acid does not turn blue litmus to red?

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  12. Which substance / tool is used to test the gases, H2 and CO2?

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  13. Name the required substances to perform a neutralization reaction in y...

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  14. What precaution to be taken while diluting the con. Acid?

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  15. How do Plaster of Paris obtain from gypsum?

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  16. What is the change you observe in litmus paper with acid ?

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  17. What is the change you observe in litmus paper with base ?

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  18. Explain the procedure that you follow to reduce water from a given sal...

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  19. Write the observations, when the hydrated salt or unhydrated salt is h...

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  20. Write some olfactory and artificial indicators

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