Question

A crystalline solid (A) reacts with hydrogen gas to form a monoatomic gas (B) and a highly associated liquid ( C).(A) is soluble in water and undergoes hydroloysis slowly to form (B),(C ) and a diatomic gas (D).When pure and dry (D) is subjected to a silent electric discharge an another pale blue gas (E) is produced which like (A) also acts a strong oxidising agent.(E) dissolves in potassium hydroxide forming an orange coloured solid which is paramagnetic in nature. (A) reacts with `IF_5, SbF_5, PF_5` etc to form the addition compounds. (C ) forms an addition compound (F) with KF with when electrolysed in molten state forms a most reactive gas (G).(B) and (G) (taken in 2:1) ratio when heated in nickel tube at `400^@ C` and 6 atm pressure forms (A).The first ionization energy `(IE_1)` of (B) is fairly close to (D).
Which of the following statements is true ?
A. Gas (G) reacts with conc NaOH to form `OF_2`
B. Pale Blue gas (E) oxidises alkaline KI to `KIO_3`
C. Pale blue gas (E) in acidic medium reacts with `K_2Cr_2O_7` to form a bright blue coloured compound `(CrO_5)`
D. (B) and (C ) both

Answer 1

Correct Answer - B
(A)`F_2` gives `O_2` gas ( C) `H_2O_2` in acidic medium from `CrO_5. "not" O_5`
(B)`KI+3O_3 to KIO_3 + 3O_2`
`underset((A))(XeF_2)overset(H_2)tounderset((B))(Xe)+underset((C ))(2HF)`
`XeF_2+H_2overset(H_2)to+underset((B))(Xe)+underset((C ))(HF)+underset((D))(O_2)`
`underset(( D))(3O_2)hArrunderset((E))(2O_3),5O_3+2KOH to 2KO_3`(orange solid)+`5O_2+H_2O`
`underset(( C))(HF)+KFtoKHF_2("molten")overset("Electrolysis")tounderset((G))(F_2)`