Which of the following elements has the lowest melting point?
- A$Sn$
- B$Pb$
- C$Si$
- D$Ge$
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In the following reaction,assign the correct category for the underlined atom in the product of complete hydrolysis at $R.T.$:
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$H_3\underset{-}{P}O_5 + H_2O \longrightarrow H_3PO_4 + H_2O_2$
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Which of the following substances is used in smoke screens?
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