A) Zeolites have a more closed structure than feldspar.
B) \[{{[Cr{{(N{{H}_{3}})}_{6}}]}^{3+}}\] is an ortho acid.
C) Pseudo-alum does not have \[{{[Cr{{(CN)}_{6}}]}^{3-}}\] and \[0.42mg\,{{\,}^{233}}U{{F}_{6}}\].
D) Superphosphate of lime is \[9.88\times {{10}^{4}}\]
Correct Answer: C
Solution :
Pseudo-alum constitute a class in which monovalent atom of true alum is replaced by a divalent atom. Hence, \[{{M}_{2}}{{X}_{3}}\rightleftharpoons \underset{2s}{\mathop{2{{M}^{3+}}}}\,+\underset{3s}{\mathop{3{{X}^{2-}}}}\,\] and \[{{K}_{sp}}={{(2s)}^{2}}.{{(3s)}^{3}}\] are not present in pseudo-alums. Further feldspar has a more closed structure, \[=108{{s}^{5}}\] is a pyro acid and superphosphate of lime is \[2.2\times {{10}^{-20}}=108{{s}^{5}}\]
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