MCQ
Which of the following have maximum tendancy for hydrate formation
- ✓$He$
- B$Xe$
- C$F^-$
- D$I^-$
✓
Answer
Correct option: A.
$He$
a
When a mixture containing chloride ion is heated with $K _2 Cr _2 O _7$ and concentrated $H _2 SO _4$, deep orange-red fumes of chromyl choloride $\left( CrO _2 Cl _2\right)$ are formed.
When a mixture containing chloride ion is heated with $K _2 Cr _2 O _7$ and concentrated $H _2 SO _4$, deep orange-red fumes of chromyl choloride $\left( CrO _2 Cl _2\right)$ are formed.
$K _2 Cr _2 O _7+4 NaCl +6 H _2 SO _4 \rightarrow 2 KHSO _4+4 NaHSO _4+\underset{\text { Oranger red fumes }}{2 CrO _2 Cl _2} \uparrow+3 H _2 O$
When chromyl chloride vapours are passed into sodium hydroxide solution, a yellow solution of sodium chromate is formed, which when treated with lead acetate gives yellow precipitate of lead chromate.
$CrO _2 Cl _2 \uparrow+2 NaOH \rightarrow \underset{ \text { Yellow solution }}{ Na _2 CrO _4}+2 HCl$
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