Class XI

Examples of refractory materials include
  1. Al2O3
  2. LiCl
  3. KF
  4. CaCl2
Impurities like silver and gold are found in anode of
  1. Magnesium
  2. Copper
  3. Graphite
  4. Carbon
 −78 °C is the
  1. Melting point of carbon dioxide
  2. Boiling point of carbon dioxide
  3. Melting point of oxygen gas
  4. Both A and B
Butane (C4H10) molecular weight is
  1. 58.122g/mol
  2. 63.71g/mol
  3. 55.12g/mol
  4. 51.19g/mol
Accurate stopwatches can measure
  1. up to 0.1 second
  2. up to 0 .01 seccond
  3. up to.001 second
  4. up to 0.2 second
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