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D,A,L and Q are 17th group elements of Modern periodic table. The correct trend of thermal stability of their hydrides is HD > HA > HL > HQ. The element ‘A’ in the sequence is
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Correct option is C
Down the group as the size of the atom increases affinity of hydrogen towards central atom decreases. Thereforea) X-H bond enthalpy decreases….HF>HCl>HBr>HI ;b) Thermal stability decreases…..HF>HCl>HBr>HI ;c) Reducing power increases…..HFSimilar Questions
Down the group the acidic character of HX in 17th group increases HF<HCl<HBr<HI because:
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