Class XII

In extraction of gold and silver, the metals is leached into aqueous solution using
  1. Cyanide ion
  2. Hydroxide ion
  3. Oxalate ion
  4. Sulphate ion
Blister copper is about
  1. --------98% Cu------------------------------------------------------------------------ 98% Cu
  2. 90% Cu
  3. 60% Cu
  4. 30% Cu
Gravity separation technique is mainly applicable to
  1. Oxide ore
  2. Halide ore
  3. Carbonate ore
  4. Sulphide ore
Which among the following statement is correct?
  1. metals are extracted from mineral
  2. all ores are minerals
  3. all minerals are ore
  4. a mineral cannot be an ore
Which metal is used in paints and lacquers?
  1. Zn
  2. Al
  3. Fe
  4. Cu
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