D And F Block Elements Question 16
Question 16 - 2024 (30 Jan Shift 2)
$A$ and $B$ formed in the following reactions are:
$CrO _2 Cl _2+4 NaOH \rightarrow A+2 NaCl+2 H _2 O$
$A+2 HCl+2 H _2 O _2 \rightarrow B+3 H _2 O$
(1) $A=Na _2 CrO _4, B=CrO _5$
(2) $A=Na _2 Cr _2 O _4, B=CrO _4$
(3) $A=Na _2 Cr _2 O _7, B=CrO _3$
(4) $A=Na _2 Cr _2 O _7, B=CrO _5$
Show Answer
Answer (1)
Solution
$CrO _2 Cl _2+4 NaOH \rightarrow Na _2 CrO _4+2 NaCl+2 H _2 O$
$Na _2 CrO _4+2 H _2 O _2+2 HCl \rightarrow \underset{\text{B}}{CrO _5}+ \underset{\substack{\text{Missing from} \\ \text{balanced equation}}}{2 NaCl}+3 H _2 O$
