JEE, NEET, Foundation & CBSE (JEE Advanced 2018

The species having pyramidal shape is
  1. SO₃
  2. BrF₃
  3. OSF₂
  4. SiO₃²⁻
Haematite ore is concentrated by :
  1. Leaching
  2. Amalgamation
  3. Gravity separation method
  4. Froth floatation process
For extraction of sodium from NaCl, the electrolytic mixture NaCl + KCl + CaCl₂ is used. During extraction process, only sodium is deposited on cathode but K and Ca do not because
  1. Na is less reactive than K and Ca
  2. Na is more reactive than K and Ca
  3. NaCl is less stable than Na₃AlF₆ and CaCl₂
  4. The discharge potential of Na+ is less than that of K⁺ and Ca²⁺ ions.
Which of the following metals cannot be extracted by the carbon reduction process ?
  1. Zn
  2. Fe
  3. Al
  4. Sn
Calamine is an ore of :
  1. Zn
  2. Mg
  3. Ca
  4. Pb
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