Physics

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Across
  1. 2. What type of reaction is releases the heat.
  2. 4. 2HCL+ZN-ZNCL2+H2.
  3. 5. what is the SI unit of power of a lens.
Down
  1. 1. What is the chemical name of MG.
  2. 3. Which mirror is used to concentrate sunlight to produce heat.