The effective component of bleaching powder is $.....$ of calcium.

Which of the following elements exists in the solid state at $25\,^oC$ temperature and atmospheric pressure?

$A$ solid element $Y$ conducts electricity and forms two types of chlorides: $YCl_n$ (a colorless volatile liquid) and $YCl_{n-2}$ (a colorless solid). To which group does element $Y$ belong?

Which of the following is/are ionic in nature?
$(i)$ $GeF_4$ $(ii)$ $SnF_4$ $(iii)$ $PbF_4$

Which allotrope of carbon is isomorphous with crystalline silicon?

$A$ tetravalent element forms monoxide and dioxide with oxygen. When air is passed over the heated element $(1273 \ K)$,producer gas is obtained. The monoxide of the element is a powerful reducing agent and reduces ferric oxide to iron. Identify the element and write the formulas of its monoxide and dioxide. Write chemical equations for the formation of producer gas and the reduction of ferric oxide with the monoxide.