Class XI

Relative molecular mass of Na2CO3 is
  1. 98
  2. 128
  3. 286
  4. 198
Phase that never gains in sublimation is
  1. Solid
  2. Liquid
  3. Gas
  4. Vapors
Old paintings became discolourised due to
  1. Lead Sulphide PbS
  2. Lead Sulphate PbSO4
  3. Lead Chloride PbCl2
  4. Lead Oxide PbO
Variable valencies are used to indicate ions
  1. Greater than +
  2. Greater than −1
  3. With more than one valency
  4. All of these
Upon heating, sodium nitrate NaNO3(s) gets converted into
  1. Sodium oxide
  2. Nitrc acid
  3. Sodium hydrogen oxide
  4. None of Above
Time Elapsed

HR : MIN : SEC
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