MCQ
Shape of $O_2F_2$ is similar to that of
- A$C_2H_2$
- B$H_2F_2$
- ✓$H_2O_2$
- DBoth $(B)$ and $(C)$
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$^{200}X \,:\, 90\%$ $^{199}X\, :\, 8.0\%$ $^{202}X\, :\, 2.0\%$
The weighted average atomic mass of the naturally occurring element $X$ is closest to......$amu$
For the reaction $3 CaO +2 Al \rightarrow 3 Ca + Al _{2} O _{3}$ the standard reaction enthalpy $\Delta_{ r } H ^{0=}$ .......... $kJ$.
(Round off to the Nearest Integer).