The atomic number of an element represents

A. number of neutrons in the nucleus

B. number of protons and neutrons in the nucleus

C. the valency of the element

D. number of protons in the nucleus

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  1. The earliest known acid is
  2. Rooms in places infected by plague are disinfected using
  3. A burning substance which continues to burn in a jar of carbon dioxide is
  4. Setting of cement is due to
  5. Optical instruments are made of
  6. The Long Form of the Periodic Table is based on
  7. Which of the following is not a supporter of combustion?
  8. Which of the following is not a food material?
  9. Radium was isolated from
  10. Heated saw dust catches fire when a drop of concentrated nitric acid is added to it. This is due to
  11. White lead is
  12. Which one of the following metals is used to extract another metal?
  13. Tincture iodine is a solution of
  14. Which or the following gases is soluble in water and Is collected by the downward displacement or air?
  15. Rain water collected after a shower la very pure because
  16. Which of the following carbon compounds is used as a fire extinguisher?
  17. The soaps used in shaving cream are
  18. Vinegar is an aqueous solution of
  19. Temporary hardness is due to the presence of
  20. Which among the following is a metalloid?
  21. A compound of carbon used as anaesthetic is
  22. Leakage in Liquefied Petroleum Gas (LPG) cylinders is easily detected by adding
  23. The commonest ore of aluminium is
  24. Dust particles in the air of large industrial cities are removed by
  25. Mortar contains cement and sand in the ratio of
  26. The principle involved in dialysis, a treatment administered to patients with affected kidneys is
  27. The poisonous nature of carbon monoxide is due to
  28. Brine is a solution of
  29. Ozone occurs in the upper layers of air in the atmosphere because
  30. LSD is