MCQ
Which of the following moleucles do not exist ?
- A$BiI_5$
- ✓$SH_4$
- C$BrF_6^-$
- DBoth $(A)$ and $(B)$
So the increasing order of bond dissociation enthalpies is $Cl _2\,>\, Br _2\,>\, F _2\,>\, I _2$.
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|
List $I$ (Anion) |
List $II$ $($Gas evolved on reaction with dil $H _{2} SO _{4})$ |
| $A.$ $CO _{3}^{2-}$ | $I.$ Colourless gas which turns lead acetate paper black |
| $B.$ $S^{2-}$ | $II.$ Colourless gas which turns acidified potassium dichromate solution green. |
| $C.$ $SO_{3}{ }^{2-}$ | $III.$ Brown fumes which turns acidified KI solution containing starch blue. |
| $D.$ $NO _{2}^{-}$ | $IV.$ Colourless gas evolved with brisk effervescence, which turns lime water milky. |
Choose the correct answer from the options given below
$A + O_2 \to B$
$B + O_2+ H_2O \to C$
$A,\, B$ and $C$ are