Class XI

Chemical formula of Sodium Sulfite is
  1. Na2SO3
  2. Na(SO4)2
  3. Na2CO3.10H2O
  4. NaH2PO4.H2O
 Examples of sublime substances do not include
  1. Solid carbon dioxide
  2. Ammonium salts
  3. Zinc
  4. Iodine
Mixtures can be converted to compounds through
  1. physical change 
  2. Chemical change 
  3. High pressures
  4. Catalytic reactions
Soluble Carbonates (CO3-2) are
  1. Na2CO3
  2. K2CO3
  3. (NH4)2CO3
  4. All of these
An easy way to separate soluble and insoluble solids is
  1. Filtration
  2. Decanting
  3. Sublimation
  4. Distillation
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