Class XI

Material is largely composed of
  1. Metals
  2. Organic matter
  3. Atoms
  4. All of these
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
Symbol of iron is
  1. I
  2. Fe
  3. Ne
  4. Sn
 Formula of carbonic acid is
  1. HCO2
  2. HCHO3
  3. H2CO2
  4. H2CO3
 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
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