Class XI

 Formula of carbonic acid is
  1. HCO2
  2. HCHO3
  3. H2CO2
  4. H2CO3
Material is largely composed of
  1. Metals
  2. Organic matter
  3. Atoms
  4. All of these
Symbol of iron is
  1. I
  2. Fe
  3. Ne
  4. Sn
 Data loggers are
  1. Data punching devices
  2. Devices used to draw graph of temperature against time
  3. Are a form of stop watch
  4. Have replaced gas syringes
To balance Al(OH)3 + HNO3 → Al(NO3)3 + H2O, number of Al(OH)3 molecules will be
  1. 1
  2. 2
  3. 3
  4. 4
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