[M+NaCN+O_(2)+H_(2)O rarr Na[M(CN)_(2)]+NaOH." Which of "],[" the following elements gets dissolved in same "],[" manner in "NaCN" solution? "]

M+NaCN+O_(2)+H_(2)O to Na[M(CN)_(2)]+NaOH Which of the following elements gets dissolved in samme manner in NaCN solution?

Which of the following will not dissolve in a hot mixture of NaOH and H_(2)O_(2) ?

Which of the following will not dissolve in a hot mixture of NaOH and H_(2)O_(2) ?

Which of the followng wild dissolve in a mixuture of NaOH and H_(2)O_(2) ?

Which of the followng will dissolve in a mixuture of NaOH and H_(2)O_(2) ?

4 Na +O_(2) to 2Na_(2) O Na_(2) O+ H_(2) O to 2NaOH

Na_(2)SO_(3)+H_(2)O_(2) rarr Na_(2)SO_(4) +H_(2)O , in reaction

Gold from Gold bearing rock can be dissolved with NaCN in presence of oxygen. Au(s)_NaCN(aq)+O_(2)(g)+H_(2)O(g)+H_(2)O(l)rarrNa[Au(CN)_(2)](aq)+NaOH(aq) For 200kg rock (containing 0.0197% gold) how many litres of 0.2M NaCN aqueous solution is required to dissolve all Gold present in rock. [Given: Atomic mass of Au=197]