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Your friend told a formula to you as 1/f...

Your friend told a formula to you as 1/f = (n - 1)`(1/R_1-1/R_2),1/f=1/v-1/u`then he put the following questions.
What are the precautions that you have to take while using these formulae ?

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BEYOND PUBLICATION-CARBON AND ITS COMPOUNDS-EXERCISE
  1. Your friend told a formula to you as 1/f = (n - 1)(1/R1-1/R2),1/f=1/v-...

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  2. Which of the following solution of acetic acid in water can be used as...

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  3. The suffix used for naming an aldehyde is

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  4. Acetic acid when dissolved in water it dissociates into ions reversibl...

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  5. Which one of the following hydrocarbons can show isomerism?

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  6. Combustion of hydrocarbon is generally accompanied by the evolution of

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  7. 2ml of ethanoic acid was taken in each of the three test tubes A, B an...

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  8. If 2ml of acetic acid was added slowly in drops to 5ml of water then w...

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  9. A few drops of ethanoic acid were added to solid sodium carbonate. The...

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  10. When acetic acid reacts with ethyl alcohol, we add conc. H2SO4, it act...

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  11. Commercially available ethanol is known is

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  12. Which of the following are molecules of varying sizes and also called ...

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  13. CH3-CH2- CH2-COOH is the IUPAC structure of

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  14. The IUPAC secondary suffix to the functional group for aldehydes is

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  15. The process of producing soaps is called

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  16. Which of the following is used as catalyst in the hydrogenation of veg...

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  17. CH3-CH2- CH2-CH3 what is IUPAC name of the chain ?

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  18. Which of the following is the general formula of a soap ?

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  19. Which of the following is known as tri-hy-droxy alcohol ?

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  20. A spherical aggregate of soap molecules in water is called

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  21. How much % solution of acetic acid in water is called vinegar ?

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