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(a) Which one of the folJowing is a food...

(a) Which one of the folJowing is a food preservative?
Equanil, Morphine, Sodium benzoate
(b) Why is bithional added to soap?
(c) Which class of drugs is used in sleeping pills?

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(a) Sodium benzoate is used as a food preservative whereas equanil is a tranquilizer and morphine is a narcotic analgesic.
(b) Bithional is an antiseptic so it is added to soaps to reduce odours producing bacterial decomposition of organic matter on the skin.
(c) Tranquilizers relieve stress, fatigue by inducing sense of well being, so they are used in the making of sleeping pills.
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XII BOARD PREVIOUS YEAR PAPER ENGLISH-XII BOARDS-Set -I
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  2. Chlorobenzene is extremely less reactive towards nucleophilic substitu...

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  3. Explain the mechanism of the reaction is given below : 2CH3-CH2-OHund...

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  4. How will you convert (i) Propene to Propan-2-ol? (ii) Phenol to 2...

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  5. (a) What type of semiconductor is obtained when silicon is doped with...

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  6. Determine the osmotic pressure of a solution prepared by dissolving 2....

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  7. Calculate the emf of the following cell at 298K: Fe(s) abs(Fe^(2+)(0...

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  8. How would you account for the following? (l) Transition metals exhib...

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  9. Complete the following chemical equations : (i) Cr2O6^(2-)+6Fe^(2+)...

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  10. Specify the oxidation number of the metals in the following coordinati...

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  11. Given the stuctures of A,B and C in the following reactions- (i) C6...

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  12. Write the names and structures of the monomers of the following polyme...

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  13. After watching a programme on TV about the adverse effects of junk foo...

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  14. (a) Which one of the folJowing is a food preservative? Equanil, Mor...

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  15. A reaction is second order in A and first order in B . (i) Write the ...

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  16. For a first order reaction, show that time required for 99% completio...

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  17. (a) Given reasons for the following : (i) Bond enthalpy of F2 is low...

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  18. Account for the following : (i) Helium is used in diving apparatus. ...

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  19. How will you bring about the following conversions? (1) Propanone t...

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  20. Complete the following reactions : (b) Give simple chemical tests t...

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