MCQ
The oxidation state of $I$ in ${H_4}IO_6^ - $ is
- ✓$+7$
- B$+5$
- C$+1$
- D$-1$
✓
Answer
Correct option: A.
$+7$
(a) $\mathop {{H_4}IO_6^ - }\limits^ * $
$4 + x - 12 = - \,1$; $x = - 1 + 8$$ = + \,7$.
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
Assertion : When a salt such as $NaCl$ dissolves, the $Na^+$ and $Cl^-$ ions leaving the crystal lattice acquire far greater freedom.
Reason : In thermodyanamic terms, the formation of solution occurs with a favourable change in free energy, i.e., $\Delta H$ has a high positive value and $T\Delta S$ a low negative value.
→Reason : In thermodyanamic terms, the formation of solution occurs with a favourable change in free energy, i.e., $\Delta H$ has a high positive value and $T\Delta S$ a low negative value.
The transitional element of $ III-B $ group is isomorphic with $A{l_2}{(S{O_4})_3}$. Therefore the compound will be
→Consider the following relations for $emf$ of an electrochemical cell
→$(i)\, EMF$ of cell = (Oxidation potential of anode) $-$ (Reduction potential of cathode)
$(ii)\,EMF$ of cell = (Oxidation potential of anode) $+$ (Reduction potential of cathode)
$(iii)\,EMF$ of cell = (Reductional potential of anode) $+$ (Reduction potential of cathode)
$(iv)\,EMF$ of cell = (Oxidation potential of anode) $-$ (Oxidation potential of cathode)
Which of the above relations are correct?
The current in a given wire is $1.8 \,A$. The number of coulombs that flow in $1.36$ minutes will be ............ $\mathrm{C}$
→The correct order of reactivity of following haloarenes towards nucleophilic substitution with aqueous $NaoH$ is:
→Choose the correct answer from the options given below:
Three moles of an ideal gas are compressed isothermally from $60 \mathrm{~L}$ to $20 \mathrm{~L}$ using constant pressure of $5 \mathrm{~atm}$. Heat exchange $Q$ for the compression is - . . . . . . . . . .Lit. atm.
→Chromatographic technique/s based on the principle of differential adsorption is/are
→$A$. Column chromatography
$B$. Thin layer chromatography
$C$. Paper chromatography
Choose the most appropriate answer from the options given below:
The products formed in the following reaction,$A$ and $B$ are
→$PCC$ (Pyridinium chloro chromate) is a good reagent for which of the following transformations ?
→The electronegativity of $C,\,\,H,\,\,O,\,\,N$ and $S$ are $2.5$, $2.1$, $3.5$, $3.0$ and $2.5$ respectively. Which of the following bond is most polar
→