Which of the following is a metalloid?

  • A
    $Si$
  • B
    $C$
  • C
    $Pb$
  • D
    $Ge$

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What are allotropes? Sketch the structure of two allotropes of carbon namely diamond and graphite. What is the impact of structure on physical properties of two allotropes?

In the following reaction,identify the nature of the product formed by the complete hydrolysis of the underlined atom at $R.T.$:
$\underline{Cr}O_2Cl_2 + 2H_2O \longrightarrow H_2CrO_4 + 2HCl$

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Silicon dissolves in excess of $HF$ due to the formation of:

Which allotropic form of carbon does not have hexagonal rings in its structure?

Glass reacts with $HF$ to produce

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