$A$ compound $(M_2O_2)$ of group $I$ element $(M)$ hydrolyses to form $M^{+}$,$OH^{-}$ and $X$. Another compound $(M'O_2)$ of group $I$ element $(M')$ hydrolyses to form $(M')^{+}$,$OH^{-}$,$X$ and $Y$. What are $X$ and $Y$ respectively?
- A$H_2O_2, O_2$
- B$O_2, H_2$
- C$H_2O_2, O_3$
- D$H_2, H_2O_2$
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Metals generally melt at very high temperatures. Amongst the following,the metal with the highest melting point will be $......$
Match the following:
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| Elements | Ore |
|---|---|
| $1$. Lithium | $a$. Beryl |
| $2$. Sodium | $b$. Spodumene |
| $3$. Beryllium | $c$. Gypsum |
| $4$. Calcium | $d$. Carnallite |
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Reason $(R)$: This is because interatomic bonds are weak.
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