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Which of the following is not an alloy of copper?

A. Bronze

B. Brass

C. Solder

D. Gun metal

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  5. Which one of the following is used in dry cleaning of garments?
  6. Harmful bacteria in drinking water cannot be destroyed by
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  15. Heavy water was discovered by
  16. Which of the following is a Bleaching agent?
  17. The raw materials used in the manufacture of cement are
  18. Which of the following carbon compounds is used as a fire extinguisher?
  19. Which is the 'odd man' in the following?
  20. Chloroform used as anaesthetic should be preserved In the dark in tightly stoppered bottles because…
  21. Rooms in places infected by plague are disinfected using
  22. The process of heating steel to bright red heat and cooling suddenly by plunging it into water is known…
  23. The most abundant noble gas present in air is
  24. Which of the following metals is the best conductor of heat and electricity?
  25. The scientist who synthesised the first organic compound (urea) in the laboratory was
  26. Suspended impurities in water are effectively removed by
  27. An element which is preserved under water is
  28. Ascorbic acid is the chemical name for
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