The metal used in storage batteries

A. Zinc

B. Iron

C. Copper

D. Lead

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  3. The hardest substance available on earth is
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  6. Which of the following is commonly called a polyamide ?
  7. Permanent hardness of water can be removed by adding
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  20. In an atomic nucleus, neutrons and protons are held together by
  21. The metal used in storage batteries
  22. Carbon tetrachloride fire extinguisher should not be used in closed room because it produces poisonous…
  23. Which of the following is the lightest metal ?
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  25. The smallest functional and structural unit of kidney is called as
  26. The recent atomic weight scale is based on
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  28. Polythene is industrially prepared by the polymerisation of
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