Class XI

 Mineral acids
  1. H ave simpler structures
  2. Are naturally occurring
  3. Are less corrosive
  4. Are found in nature
 When hot molten liquid cools,
  1. first crystals are most pure
  2. impure substances may also form crystals
  3. it turns into gas
  4. it turns into aqueous solution
 Number of electrons (e-) in phosphorus (P) is 15. valence electrons shall be
  1. 2
  2. 4
  3. 1
  4. 5
 First element in periodic table to have 8 valence electrons in third shell is
  1. Silicon
  2. Chlorine
  3. Argon
  4. Potassium
 In Universal indicators, red color shows
  1. strong acids
  2. strong alkalis
  3. weak acids
  4. weak bases
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