The acidic oxide from the following is

Which of the following statements is correct for the compounds $HF, HBr, H_2Se, H_2Te, H_3P$?

$C_{60}$ (Buckminsterfullerene) consists of which of the following?

Which of the following allotropes of carbon is isomorphous with crystalline silicon?

In which of the following silicates,only two corners per tetrahedron are shared?
$I$. Pyro silicate
$II$. Cyclic silicate
$III$. Double chain silicate
$IV$. Single chain silicate
$V$. $3D$ silicate
$VI$. Sheet silicate

Which of the following statements is not correct regarding $CO$?