MCQ
Which of the following is incorrect about $K _{2} Cr _{2} O _{7} ?$
- AIt can be prepared from $K _{2} Cr _{2} O _{7}$.
- BIt is used in redox titrations.
- ✓It is stable in both acid $\&$ base
- DIt is orange in colour
✓
Answer
Correct option: C.
It is stable in both acid $\&$ base
c
In redox reactions potassium dichromate is used as an oxidizing agent.
In redox reactions potassium dichromate is used as an oxidizing agent.
$2 CrO _{4}^{2-} \frac{\text { In acidic medium }}{ H ^{+}} \rightarrow Cr _{7} O _{7}^{2-}+ H _{2} O$
Potassium dichromate is orange in color and used in redox titrations. But it is not stable in both acid and base.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
As electron moves away from the nucleus, its potential energy
Homolytic fission of the following alkanes forms free radicals
→$CH_3 - CH_3, CH_3 - CH_2 $$- CH_3, (CH_3)_2CH - CH_3,$
$ CH_3 - CH_2 - CH(CH_3)_2.$
Increasing order of stability of the radicals is
Among the following compounds which is planar in shape
Among the following, the weakest Lewis base is
$P$ and $Q$ are isomers of dicarboxylic acid $C _4 H _4 O _4$. Both decolorize $Br _2 / H _2 O$. On heating, $P$ forms the cyclic anhydride.
→Upon treatment with dilute alkaline $KMnO _4, P$ as well as $Q$ could produce one or more than one from $S , T$ and $U$.$Image$
$1.$ Compounds formed form $P$ and $Q$ are, respectively
$(A)$ Optically active $S$ and optically active pair $(T, U)$
$(B)$ Optically inactive $S$ and optically inactive pair $(T, U)$
$(C)$ Optically active pair $(T, U)$ and optically active $S$
$(D)$ Optically inactive pair $(T, U)$ and optically inactive $S$
$2.$ In the following reaction sequences $V$ and $W$ are respectively :$Image$
mcq $Image$
Give the answer question $1$ and $2.$
How much ....$kJ$ energy is released when $6$ mole of octane is burnt in air ? Given $\Delta H_f^o$ for $C{O_2}(g),\,{H_2}O(g)$ and ${C_8}{H_{18}}(l)$ respectively are $-490,-240\, and + 160 \,kJ/mol$
→The electronic transition from $n = 2$ to $n = 1$ will produce the shortest wavelength in $($where, $n =$ principal quantum number$).$
→According to molecular orbital theory, which of the following is true with respect to $Li_2^ + $ and $Li_2^ - $ ?
→Complete the following reactions and identify $A, B\,C$ respectively
→Alkali metals are kept in kerosene oil. Which of the following reason$(s)$ is$/$ are correct regarding this statement?
→