MCQ
Element showing the highest number of oxidation states is :
- ✓Mn
- BNi
- CFe
- DCr
✓
Answer
Correct option: A.
Mn
a
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
A compound does not react with $2,4$ di-nitrophenyl hydrazine and $Na$ , compound is
→Hydrogenation of ${C_6}{H_5}CHOH - COOH$ over $Rh - A{l_2}{O_3}$ catalyst in methanol gives
→Which one of the following will be most readily dehydrated in acidic condition
Raffinose is
Mixture of $PhCHO$ and $HCHO$ is treated with $NaOH$,then cannizzaro reaction involve
→$(A)$ Reduction of $HCHO$
$(B)$ Oxidation of $HCHO$
$(C)$ Reduction of $PhCHO$
$(D)$ Oxidation of $Ph-CHO$
When a nucleophile encounters a ketone, the site of attack is
Which of the following statements are correct about the reaction between the copper metal and dilute $HNO_3$ ?
→$(I)$ The principal reducing product is $NO$ gas
$(II)$ $Cu$ metal is oxidised to $Cu^{2+}$ ( aq.) ion which is blue in colour.
$(III)$ $NO$ is paramagnetic and has one unpaired electron in antibonding molecular orbital
$(IV)$ $NO$ reacts with $O_2$ to produce $NO_2$ which is linear in shape
Choose the correct statements
$(i)\,\,\begin{matrix}
CHO\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
{{(CH-OH)}_{3}}\,\,\,\,\,\, \\
|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
\,\,C{{H}_{2}}-OH\,\,\,\,\,\,\,\,\,\, \\
\end{matrix}\xrightarrow{4HI{{O}_{4}}} Product$ $(ii)\,\,\begin{matrix}
C{{H}_{2}}OH\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
{{(CH-OH)}_{4}}\,\,\,\,\,\, \\
|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
\,\,C{{H}_{2}}-OH\,\,\,\,\,\,\,\,\,\, \\
\end{matrix}\xrightarrow{5HI{{O}_{4}}} Product$
→CHO\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
{{(CH-OH)}_{3}}\,\,\,\,\,\, \\
|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
\,\,C{{H}_{2}}-OH\,\,\,\,\,\,\,\,\,\, \\
\end{matrix}\xrightarrow{4HI{{O}_{4}}} Product$ $(ii)\,\,\begin{matrix}
C{{H}_{2}}OH\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
{{(CH-OH)}_{4}}\,\,\,\,\,\, \\
|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
\,\,C{{H}_{2}}-OH\,\,\,\,\,\,\,\,\,\, \\
\end{matrix}\xrightarrow{5HI{{O}_{4}}} Product$
Ratio of moles of formic acid obtained in reaction $(i)$ and reaction $(ii)$ is
Arrange these compounds in decreasing order of basic strength ?
If in a voltaic cell $5\,gm$ of zinc is consumed, then we get how many ampere hours ?(Given that $E.C.E.$ of $Zn$ is $3.387 \times {10^{ - 7}}\,kg/coulomb$)
→