MCQ
The most abundant element in the atmosphere is:
- APhosphorus
- BOxygen
- ✓Nitrogen
- DCarbon
✓
Answer
Correct option: C.
Nitrogen
The most abundant element in the atmosphere is nitrogen.
Atmosphere contains $78\%$ nitrogen.
Atmosphere contains $78\%$ nitrogen.
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
Lead pipes are readily corroded by:
$(i)\,\,\begin{matrix}
CHO\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
{{(CH-OH)}_{3}}\,\,\,\,\,\, \\
|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
\,\,C{{H}_{2}}-OH\,\,\,\,\,\,\,\,\,\, \\
\end{matrix}\xrightarrow{4HI{{O}_{4}}} Product$ $(ii)\,\,\begin{matrix}
C{{H}_{2}}OH\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
{{(CH-OH)}_{4}}\,\,\,\,\,\, \\
|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
\,\,C{{H}_{2}}-OH\,\,\,\,\,\,\,\,\,\, \\
\end{matrix}\xrightarrow{5HI{{O}_{4}}} Product$
→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
Which of the following complexes are homoleptic?
$a. {\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}} $
$b. {\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right]^{+}} $
$c. {\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}} $
$d. {\left[\mathrm{Ni}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right]} $
→$a. {\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}} $
$b. {\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right]^{+}} $
$c. {\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}} $
$d. {\left[\mathrm{Ni}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right]} $
$C_6H_6$ $+$ $CH_3-CH=CH_2$ $\xrightarrow{{{H_3}P{O_4}}}A\,\xrightarrow[{heat}]{{{O_2}}}B\xrightarrow{{dil\,.\,{H_2}S{O_4}}}C + D$
→$A, \,C$ and $D$ are
Consider the following alcohols
→The order of decreasing reactivities of these alcohols towards substitution with $HBr$ is
$ClF _5$ at room temperature is a:
→Major product of the reaction is :
The letter $‘D'$ in $D-$glucose signifies
→Which of the following elements is alloyed with copper to form brass
ortho-nitrophenol is less soluble in water than $p$-and $m$-nitrophenols because :
→