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White vitriol is

A. ZnSO4 . 7H2O

B. FeSO4 . 7H2O

C. MgSO4 . 7H2O

D. CaSO4 . 2H2O

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  1. Hard water does not lather well with soap because
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  3. A non-metal which is a good conductor or heat and electricity is
  4. Tincture iodine is a solution of
  5. Which of the following statements regarding natural radioactivity is true?
  6. A mixture of naphthalene and sand is separated by
  7. Which of the following is an essential constituent of acids?
  8. Which or the following is not a constituent or gun powder?
  9. Lunar caustic is
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  12. Petroleum ether is also known as
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  14. Which is the 'odd man' in the following?
  15. An essential condition for rusting is
  16. Which of the following is used as a food preservative?
  17. Ozone is an allotrope of Oxygen, containing ______ atom/s of oxygen per molecule instead of two.
  18. The compound or nitrogen used in dry cells is
  19. Rooms in places infected by plague are disinfected using
  20. Which among the following is a local anaesthetic?
  21. Physico-chemical characteristics of water in water sources undergo changes due to
  22. Which of the following cannot be used for the preparation of soap?
  23. Dust particles in the air of large industrial cities are removed by
  24. The artificial silk produced from cellulose is
  25. Heated saw dust catches fire when a drop of concentrated nitric acid is added to it. This is due to
  26. The vitamin that is found in citrus fruits such as lemon and orange is
  27. Argyrol used as eye ointment is a solution of
  28. Biogas is obtained during
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  30. One method by which the components of air can be separated is