Class XI

Chemical formula of calcium nitrate is
  1. Chemical formula of calcium nitrate is
  2. CNOH
  3. Ca(NO3)2
  4. CaNO3
PH values has a range of
  1. 1 to 7
  2. 0 to 10
  3. 1 to 14
  4. 0 to 14
Pure substances
  1. Have fixed and exact boiling point
  2. Have fixed and exact melting points
  3. Form only one post on chromatogram
  4. All of these
Valency is numerically equal to
  1. Charge of an ion
  2. Combining power of an atom
  3. Combining power of a radical
  4. All of these
 During a chemical reaction, the
  1. Mass of catalyst remains unchanged
  2. Physical state of catalysts remain unchanged
  3. Changes in chemical composition of catalysts may be observed
  4. Chemical composition of catalyst may change
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