Class XI

Electron balances can measure accurately up to
  1. 0.01g
  2. 0.001 g
  3. 0.1g
  4. Both A and B
Elements in same period may have
  1. Different number of neutrons
  2. Same number of shellssame number of shellssame number of shells
  3. Different number of electrons
  4. All of these
Cations are
  1. Positively charged ions
  2. Negatively charged ions
  3. Travel towards anode during electrolysis
  4. Travel towards anode during polarization
Upon oxidation of acidified potassium manganate (VII), purple color of Manganese
  1. Stays
  2. Changes to pink
  3. Becomes colorless
  4. Becomes blue
Number of protons in sodium are 11. number of electrons in outermost shell will be
  1. 1
  2. 2
  3. 3
  4. 4
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