Correct statement among the following is

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Elements of Group 7, 8, 9 form Interstitial hydrides

H2 can reduce Pd2+ but cannot reduce Zn+2

Calgon is Na2Al2Si2O8.xH2O

Calgon forms insoluble complexes with cations causing hardness

answer is B.

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Detailed Solution

(1) ….false …. Elements of group 7,8,9 cannot form Hydrides(2)…trueEPd+2/Pdo > EH+/12H2o > Ezn+2/zno∴H2 can reduce Pd+2 but not Zn+2(3)….false….. Na2Na4PO36 is calogon(4) …false… Calgon forms soluble complexes with Ca+2 & Mg+2 which remain in the solution

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